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2012 Vol. 42, No. 6
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2012, 42(6): 1-4,28.
doi: 10.13204/j.gyjz201206001
Abstract:
In view of the fact that the state is vigorously promoting the industrial restructuring, the paper analyzes theinternal demand and external power of the industrial restructuring in old industrial cities with the example ofMaanshan. Taking the case of Huashan Software-Industrial Park, the paper expatiates the software- industry parkplanning innovative ideas, practical situation, outlook and problems from the respects of the city, space, vitality,ecology, human nature.
In view of the fact that the state is vigorously promoting the industrial restructuring, the paper analyzes theinternal demand and external power of the industrial restructuring in old industrial cities with the example ofMaanshan. Taking the case of Huashan Software-Industrial Park, the paper expatiates the software- industry parkplanning innovative ideas, practical situation, outlook and problems from the respects of the city, space, vitality,ecology, human nature.
2012, 42(6): 5-7.
doi: 10.13204/j.gyjz201206002
Abstract:
There are always about the similar and monotonic visions in the design of industrial factory buildings dueto lack of regional characteristics. By means of taking the planning and monomer design of factory area for HuataiGroup, for example, from the general layout, design skills and element, the enterprise culture expression in design,it was analyzed how to express the regional characteristics in the design of industrial factory buildings, which couldprovide experience for designers to design industrial factory buildings.
There are always about the similar and monotonic visions in the design of industrial factory buildings dueto lack of regional characteristics. By means of taking the planning and monomer design of factory area for HuataiGroup, for example, from the general layout, design skills and element, the enterprise culture expression in design,it was analyzed how to express the regional characteristics in the design of industrial factory buildings, which couldprovide experience for designers to design industrial factory buildings.
2012, 42(6): 8-11,141.
doi: 10.13204/j.gyjz201206003
Abstract:
With the changes of the domestic and foreign environment and their own evolution, the development zonesare generally facing the reconstructions of functional and spatial transformation. It was analyzed the planning of thehigh-tech zone in Pingdingshan, which it should become a complex urban functional area. For the problems ofindustry, function, space, environment and other issues in the transition process, it was also explored the planningstrategies from the macro of the development zone, meso and micro levels of the park development respectively.
With the changes of the domestic and foreign environment and their own evolution, the development zonesare generally facing the reconstructions of functional and spatial transformation. It was analyzed the planning of thehigh-tech zone in Pingdingshan, which it should become a complex urban functional area. For the problems ofindustry, function, space, environment and other issues in the transition process, it was also explored the planningstrategies from the macro of the development zone, meso and micro levels of the park development respectively.
2012, 42(6): 12-15.
doi: 10.13204/j.gyjz201206004
Abstract:
This article made a brief introduction to the renovation project of the Pilsner Urquell in Czech Republic,summed up the ways of activating the traditional industries through industrial heritage renovation to promote regionalindustrial recovery, and retain the memory of urban history, which included the renovation concept of heritagepreservation and cultural inheritance, heritage tourism and economic feeding, new processes and activation. It hasalso included the renovation methods of and authenticity restoration, integration space and function of old and new,landscape transformation. This instance has provided a positive inspiration to industrial heritage renovation, especiallythe renovation of existing traditional industries and related industrial heritage in China.
This article made a brief introduction to the renovation project of the Pilsner Urquell in Czech Republic,summed up the ways of activating the traditional industries through industrial heritage renovation to promote regionalindustrial recovery, and retain the memory of urban history, which included the renovation concept of heritagepreservation and cultural inheritance, heritage tourism and economic feeding, new processes and activation. It hasalso included the renovation methods of and authenticity restoration, integration space and function of old and new,landscape transformation. This instance has provided a positive inspiration to industrial heritage renovation, especiallythe renovation of existing traditional industries and related industrial heritage in China.
2012, 42(6): 16-19.
doi: 10.13204/j.gyjz201206005
Abstract:
Prosperity of national industry and commerce has left many industrial architectural heritages which areworthy of respect and protection in modern cities. In the process of urban redevelopment, more and more attention hasbeen paid to how to use these cultural and economic values of industrial heritages in real estate development projects.Through the analysis of re-use of industrial heritages in Xishuidong Residential Project in Wuxi, it was tried to discussthe possibility of industrial heritage re-use and the strategies of re-use. And it can be concluded that it is of greatsignificance to the improvement of the urban environment, to the city' s memories, to the maintaining of the charm ofthe city life and the cultural renaissance when our residential design concerned with the conservation and re-use of theindustrial heritages.
Prosperity of national industry and commerce has left many industrial architectural heritages which areworthy of respect and protection in modern cities. In the process of urban redevelopment, more and more attention hasbeen paid to how to use these cultural and economic values of industrial heritages in real estate development projects.Through the analysis of re-use of industrial heritages in Xishuidong Residential Project in Wuxi, it was tried to discussthe possibility of industrial heritage re-use and the strategies of re-use. And it can be concluded that it is of greatsignificance to the improvement of the urban environment, to the city' s memories, to the maintaining of the charm ofthe city life and the cultural renaissance when our residential design concerned with the conservation and re-use of theindustrial heritages.
2012, 42(6): 20-24,82.
doi: 10.13204/j.gyjz201206006
Abstract:
In this paper, the elements, principles and pattern were summarized for revitalization of industrial building heritage. A design case showed how these elements, principles and pattern were implemented in detail.
In this paper, the elements, principles and pattern were summarized for revitalization of industrial building heritage. A design case showed how these elements, principles and pattern were implemented in detail.
2012, 42(6): 25-28.
doi: 10.13204/j.gyjz201206007
Abstract:
Because of the demand on low carbon energy conservation and environmental protection, the boiler roomfor winter heating in China University of Mining and Technology was closed more than ten years ago, idling already fora long time. The architectural modelling of the boiler room is full of industrial atmosphere, it has a strongidentification and is remembered by many people in the college. Now it was repaired and a new function was given totransform it into a modern office. The transformation design use a variety of new technologies and new techniques wereused for the design, and introduces the concept of green building was also used, so as to transform the boiler room tofollow after the development trend of the low carbon ecological architecture.
Because of the demand on low carbon energy conservation and environmental protection, the boiler roomfor winter heating in China University of Mining and Technology was closed more than ten years ago, idling already fora long time. The architectural modelling of the boiler room is full of industrial atmosphere, it has a strongidentification and is remembered by many people in the college. Now it was repaired and a new function was given totransform it into a modern office. The transformation design use a variety of new technologies and new techniques wereused for the design, and introduces the concept of green building was also used, so as to transform the boiler room tofollow after the development trend of the low carbon ecological architecture.
2012, 42(6): 29-33.
doi: 10.13204/j.gyjz201206008
Abstract:
A large number of old industrial buildings occurred during the process of the constructions in southwvestregions, which had not only physical functions but also carried the history and culture. It was analysed the values ofPanzhihua industrial building heritages, putting forward some ideas, and also pointed out that a continuation ofindustrial building heritage is the route of the contexture development of these industrial cities in southwest regions.
A large number of old industrial buildings occurred during the process of the constructions in southwvestregions, which had not only physical functions but also carried the history and culture. It was analysed the values ofPanzhihua industrial building heritages, putting forward some ideas, and also pointed out that a continuation ofindustrial building heritage is the route of the contexture development of these industrial cities in southwest regions.
2012, 42(6): 34-37.
doi: 10.13204/j.gyjz201206009
Abstract:
It was integrated reconstruction and the relocation' s practice of the plant front area in QingyangPetrochemical Factory and analyzed the overall reconstruction planning and architectural landscape design of the plantarea by the method of combining with the theory and practice. Through pre-site reconnaissance and informationcollection it was carried out a deep and holistical design, and explored reasonable and effective ideas of industrialplant front area, and also summarized some design principles of new industrial plant's reconstruction. Which provideda positive and effective thinking for industrial plant's update reconstruction.
It was integrated reconstruction and the relocation' s practice of the plant front area in QingyangPetrochemical Factory and analyzed the overall reconstruction planning and architectural landscape design of the plantarea by the method of combining with the theory and practice. Through pre-site reconnaissance and informationcollection it was carried out a deep and holistical design, and explored reasonable and effective ideas of industrialplant front area, and also summarized some design principles of new industrial plant's reconstruction. Which provideda positive and effective thinking for industrial plant's update reconstruction.
2012, 42(6): 38-40.
doi: 10.13204/j.gyjz201206010
Abstract:
Through structural performance testing of 4 continuous prestressed concrete laminated hollow slabs whichreinforced with cold-rolled ribbed in bearing, it was studied their structural performances and also analysed theirperformances of redistribution of internal forces.
Through structural performance testing of 4 continuous prestressed concrete laminated hollow slabs whichreinforced with cold-rolled ribbed in bearing, it was studied their structural performances and also analysed theirperformances of redistribution of internal forces.
2012, 42(6): 41-45.
doi: 10.13204/j.gyjz201206011
Abstract:
In order to study systematically the stiffness matrix and load array of space beam element with the impactof shear deformation, the element was analyzed by the energy variation principle. The displacement functions forspace beam element with shear deformation effect were put forward, and then expressions of element stiffness matrixand load array for this beam were deduced strictly by the minimum potential energy principle. Explicit integration wascarried out for the element stiffness matrix and the equivalent nodal loads under some forms of no-node load within aplane were calculated as well, which had revised the mistakes in relevant reference. Results show that the elementstiffness matrix computed by the method is consistent with those in related documents calculated by other methods,which makes a foundation for compiling the finite element procedure for space mega frame structure. Which has agood theoretical and practical value in the calculation of the element stiffness matrixes and load arrays for otherelements as well.
In order to study systematically the stiffness matrix and load array of space beam element with the impactof shear deformation, the element was analyzed by the energy variation principle. The displacement functions forspace beam element with shear deformation effect were put forward, and then expressions of element stiffness matrixand load array for this beam were deduced strictly by the minimum potential energy principle. Explicit integration wascarried out for the element stiffness matrix and the equivalent nodal loads under some forms of no-node load within aplane were calculated as well, which had revised the mistakes in relevant reference. Results show that the elementstiffness matrix computed by the method is consistent with those in related documents calculated by other methods,which makes a foundation for compiling the finite element procedure for space mega frame structure. Which has agood theoretical and practical value in the calculation of the element stiffness matrixes and load arrays for otherelements as well.
2012, 42(6): 46-54.
doi: 10.13204/j.gyjz201206012
Abstract:
Tubular hollow slab is the hollow slab whose internal mold is permanent internal mold of GBF serial highstrength thin-wall pipe. Experimental study on the behavior of plastic internal force redistribution of two kinds of tubular hollow slabs which have different arrangement manner of the high-strength thin-wall pipes was conducted.One of the experimental slabs was called parallel slab inside which the GBF high-strength thin-walled tubes wereplaced to be parallel with the span direction, the other was called vertical slab inside which the GBF thin-walledtubes were placed to be vertical with the span direction. It was indicated from the study that the tubular hollowcontinuous slab had good performance of plastic internal force redistribution. The parallel slab could meetrequirements of the bearing capacity and the regular service when the value of moment modulating is 30. 7 % at least.And the vertical slab could meet requirements of the bearing capacity and the regular service when the value ofmoment modulating is 27 % at least. And, the moment-curvature relationship of section approximately conforms tothe constitutive model of two straight lines.
Tubular hollow slab is the hollow slab whose internal mold is permanent internal mold of GBF serial highstrength thin-wall pipe. Experimental study on the behavior of plastic internal force redistribution of two kinds of tubular hollow slabs which have different arrangement manner of the high-strength thin-wall pipes was conducted.One of the experimental slabs was called parallel slab inside which the GBF high-strength thin-walled tubes wereplaced to be parallel with the span direction, the other was called vertical slab inside which the GBF thin-walledtubes were placed to be vertical with the span direction. It was indicated from the study that the tubular hollowcontinuous slab had good performance of plastic internal force redistribution. The parallel slab could meetrequirements of the bearing capacity and the regular service when the value of moment modulating is 30. 7 % at least.And the vertical slab could meet requirements of the bearing capacity and the regular service when the value ofmoment modulating is 27 % at least. And, the moment-curvature relationship of section approximately conforms tothe constitutive model of two straight lines.
2012, 42(6): 55-59.
doi: 10.13204/j.gyjz201206013
Abstract:
Based on wind tunnel test of Wuxi New District Science and Technology Communication Center, the windpressure distribution was analyzed under the condition of with and without surrounding buildings. Moreover, the shapecoefficients of three typical regions of the plum-blossom-shaped roof were studied. Several conclusions about aerointerference of surrounding high-rise buildings on large-span curved roof were provided. Although the mostdisadvantageous wind direction and wind pressure have changed while aero-interference occurred, the roof of theinterfered building still mainly bear negative wind pressure and the most fragile location is still along eaves. Windpressure of the interfered building is acutely increased under the action of wind-catching effect. Wind pressure of theinterfered building changes from negative to positive value under the action of wind-obstructing effect. The concave ofroof will bear the greatest sucking load when the direction of its trough is identical to wind direction because eddycurrents cooperate with wind-catching effect, which should be focused in the design of the curved roof.
Based on wind tunnel test of Wuxi New District Science and Technology Communication Center, the windpressure distribution was analyzed under the condition of with and without surrounding buildings. Moreover, the shapecoefficients of three typical regions of the plum-blossom-shaped roof were studied. Several conclusions about aerointerference of surrounding high-rise buildings on large-span curved roof were provided. Although the mostdisadvantageous wind direction and wind pressure have changed while aero-interference occurred, the roof of theinterfered building still mainly bear negative wind pressure and the most fragile location is still along eaves. Windpressure of the interfered building is acutely increased under the action of wind-catching effect. Wind pressure of theinterfered building changes from negative to positive value under the action of wind-obstructing effect. The concave ofroof will bear the greatest sucking load when the direction of its trough is identical to wind direction because eddycurrents cooperate with wind-catching effect, which should be focused in the design of the curved roof.
2012, 42(6): 60-64,130.
doi: 10.13204/j.gyjz201206014
Abstract:
This paper describes an experimental research on 3 damaged steel reinforced L shape section concretecolumns and a damaged normal L shape section concrete column strengthened by steel encasement under horizontallow cyclic loading. Based on the test results, failure mode, the hysteretic curves, energy dissipation, ductility andstiffness degradation were examined. The results indicated that, the failure mode of the column enhanced by steelencasement was concrete crush of the web of the columns, and their hysteretic curves were plump, and theyperformed good seismic performance.
This paper describes an experimental research on 3 damaged steel reinforced L shape section concretecolumns and a damaged normal L shape section concrete column strengthened by steel encasement under horizontallow cyclic loading. Based on the test results, failure mode, the hysteretic curves, energy dissipation, ductility andstiffness degradation were examined. The results indicated that, the failure mode of the column enhanced by steelencasement was concrete crush of the web of the columns, and their hysteretic curves were plump, and theyperformed good seismic performance.
2012, 42(6): 65-71.
doi: 10.13204/j.gyjz201206015
Abstract:
It was carried out an experimental research on seismic performance of brick masonry walls with pilasterreinforced by glass GFRP whenthrough-wall anchors were used. By carrying out the experiment of six pieces ofbrick masonry walls with pilaster strengthened by GFRP and three pieces of masonry wall with through-wallanchor under low reversed cyclic loading, the failure characteristic of every wall was explained ; Seismicperformances such as resilience, rigidity and its degeneration, deformation, energy consumption ifthrough-wallanchors were taken or not. The test results showed that using through-wall anchors could decrease rigiditydegeneration of the wall; through-wall anchors had some influence on deformation of the wall, and was betterthan strengthening modes; Usingthrough-wall anchors had little influence on energy consumption of the wallsunder the ultimate load, but was another thing under the ultimate displacement.
It was carried out an experimental research on seismic performance of brick masonry walls with pilasterreinforced by glass GFRP whenthrough-wall anchors were used. By carrying out the experiment of six pieces ofbrick masonry walls with pilaster strengthened by GFRP and three pieces of masonry wall with through-wallanchor under low reversed cyclic loading, the failure characteristic of every wall was explained ; Seismicperformances such as resilience, rigidity and its degeneration, deformation, energy consumption ifthrough-wallanchors were taken or not. The test results showed that using through-wall anchors could decrease rigiditydegeneration of the wall; through-wall anchors had some influence on deformation of the wall, and was betterthan strengthening modes; Usingthrough-wall anchors had little influence on energy consumption of the wallsunder the ultimate load, but was another thing under the ultimate displacement.
2012, 42(6): 72-76.
doi: 10.13204/j.gyjz201206016
Abstract:
Eight RC beams including four CFRP strengthened beams were tested after short-term fatigue. Thedistortion, stress distribution, ultimate load of corroded reinforced concrete beams were investigated. Both theexperimental and analytical results indicated that fatigue loading had a significant impact on the performance ofcorroded RC beams; It could reduce the ultimate strength and ductility of the beams substantially. The ultimate loadcarrying capacity of the CFRP-strengthened corroded beams are enhanced evidently and had a preferable ductilityduring damage. The loading capacity of RC beams with CFRP strengthened was in creased by 22% to 47 %. The Uwrap CFRP sheet had an obvious effect on beams, the potential delamination of the concrete cover following steelcorrosion could cause sudden failure of RC beams strengthened with CFRP at later loading stages. Repairing a lowcorrosion rate beams by CFRP still had good mechanical properties after a short-term fatigue loadings.
Eight RC beams including four CFRP strengthened beams were tested after short-term fatigue. Thedistortion, stress distribution, ultimate load of corroded reinforced concrete beams were investigated. Both theexperimental and analytical results indicated that fatigue loading had a significant impact on the performance ofcorroded RC beams; It could reduce the ultimate strength and ductility of the beams substantially. The ultimate loadcarrying capacity of the CFRP-strengthened corroded beams are enhanced evidently and had a preferable ductilityduring damage. The loading capacity of RC beams with CFRP strengthened was in creased by 22% to 47 %. The Uwrap CFRP sheet had an obvious effect on beams, the potential delamination of the concrete cover following steelcorrosion could cause sudden failure of RC beams strengthened with CFRP at later loading stages. Repairing a lowcorrosion rate beams by CFRP still had good mechanical properties after a short-term fatigue loadings.
EXPERIMENTAL STUDY ON FLEXURAL FATIGUE PERFORMANCE OF RC BEAMS STRENGTHENED WITH HYBRID FIBER SHEETS
2012, 42(6): 77-82.
doi: 10.13204/j.gyjz201206017
Abstract:
The variable amplitude test of BC beams was investigated with 5 specimens, in which the flexural fatiguebehavior of RC beams strengthened with carbon /glass hybrid fiber sheets and carbon /basalt hybrid fiber sheets wasstudied, and compared with that of RC beams strengthened with basalt fiber sheets. Experimental results showed thatthe anti-faigue properties of RC beams stengthened with hybrid fiber sheets was better, and the fatigue life wassignificantly prologed. Based on the root mean square(RMS) method, the S - N curves formula on variable amplitudefatigue was proposed, which may be reference for the engineering design.
The variable amplitude test of BC beams was investigated with 5 specimens, in which the flexural fatiguebehavior of RC beams strengthened with carbon /glass hybrid fiber sheets and carbon /basalt hybrid fiber sheets wasstudied, and compared with that of RC beams strengthened with basalt fiber sheets. Experimental results showed thatthe anti-faigue properties of RC beams stengthened with hybrid fiber sheets was better, and the fatigue life wassignificantly prologed. Based on the root mean square(RMS) method, the S - N curves formula on variable amplitudefatigue was proposed, which may be reference for the engineering design.
2012, 42(6): 83-87.
doi: 10.13204/j.gyjz201206018
Abstract:
Seven reinforced concrete beams (two contrast beams and five externally prestressed beams) were tested.The fracture morphology, crack situation, and regularity of changing strain of steel bars and external tendons underdifferent stress of tension control were analyzed through exprerimental data. In order to simulate the conditions ofpractical projects, there were three kinds of test conditions in the experiment: 1 ) before loading prestress was appliedto beam; 2 ) loading to crack, then unloading and prestressing; 3 ) loading to crack, then not unloading andprestressing. Finally, according to ultimate stress theories of unbounded prestressed steel and ultimate condition theorybased on plastic hinge, it was studied the caculative method of ultimate bending moment. It was shown that theresearch achievements of unbounded prestressed structure could also apply to externally prestressed structure whensecond-order effect was small.
Seven reinforced concrete beams (two contrast beams and five externally prestressed beams) were tested.The fracture morphology, crack situation, and regularity of changing strain of steel bars and external tendons underdifferent stress of tension control were analyzed through exprerimental data. In order to simulate the conditions ofpractical projects, there were three kinds of test conditions in the experiment: 1 ) before loading prestress was appliedto beam; 2 ) loading to crack, then unloading and prestressing; 3 ) loading to crack, then not unloading andprestressing. Finally, according to ultimate stress theories of unbounded prestressed steel and ultimate condition theorybased on plastic hinge, it was studied the caculative method of ultimate bending moment. It was shown that theresearch achievements of unbounded prestressed structure could also apply to externally prestressed structure whensecond-order effect was small.
2012, 42(6): 88-91.
doi: 10.13204/j.gyjz201206019
Abstract:
To analyse the mechanical property, the experimental study on timber beam strengthened with CFRP sheetwere performed. The shear behaviors, such as failure patterns in shear, load-deflection curves and relationshipbetween load and strain were obtained. The results showed that the failure patterns in shear were usually shear failurealong the grain. The ductility of failure along the grain was very good, and the flexural failure was a typical brittlefailure. The CFRP sheets adjacent to the supports and loading points were subjected to compression until failure.
To analyse the mechanical property, the experimental study on timber beam strengthened with CFRP sheetwere performed. The shear behaviors, such as failure patterns in shear, load-deflection curves and relationshipbetween load and strain were obtained. The results showed that the failure patterns in shear were usually shear failurealong the grain. The ductility of failure along the grain was very good, and the flexural failure was a typical brittlefailure. The CFRP sheets adjacent to the supports and loading points were subjected to compression until failure.
2012, 42(6): 92-97.
doi: 10.13204/j.gyjz201206020
Abstract:
Anchor block is one of the key structure in the externally prestressed concrete bridges, whose rationalityplays a very important role in the bridge fatigue, durability and load capacity. Taking use of the large common finiteelement program ANSYS on the actual bridge anchor block, the model was divided into several sections by the spacing 0. 2 m, by which horizontal, vertical and vertical stress contours in each section were got, then change in the crosssection stress was compared from the maximum stress path in the anchor block. Based on the pattern of the changes ofthe stress, the effect of position and thickness of anchorage on the three-directional stress in the anchor block wasconsidered, at last the reasonable anchorage structure was got, which had some references for the similar design of theanchorage system.
Anchor block is one of the key structure in the externally prestressed concrete bridges, whose rationalityplays a very important role in the bridge fatigue, durability and load capacity. Taking use of the large common finiteelement program ANSYS on the actual bridge anchor block, the model was divided into several sections by the spacing 0. 2 m, by which horizontal, vertical and vertical stress contours in each section were got, then change in the crosssection stress was compared from the maximum stress path in the anchor block. Based on the pattern of the changes ofthe stress, the effect of position and thickness of anchorage on the three-directional stress in the anchor block wasconsidered, at last the reasonable anchorage structure was got, which had some references for the similar design of theanchorage system.
2012, 42(6): 98-101.
doi: 10.13204/j.gyjz201206021
Abstract:
Strain gauge is often used to study and monitor the strain of the component in the foundation. But thepositive pressure applied to the strain gauge will influence the strain measuring. The experiments were done to studythe influence. The study indicated that the positive pressure would influence the measuring of strain. As the strain tobe measured was small the influence was bigger, about 1 0%. As the strain to be measured was bigger the influencewas about 5 %.
Strain gauge is often used to study and monitor the strain of the component in the foundation. But thepositive pressure applied to the strain gauge will influence the strain measuring. The experiments were done to studythe influence. The study indicated that the positive pressure would influence the measuring of strain. As the strain tobe measured was small the influence was bigger, about 1 0%. As the strain to be measured was bigger the influencewas about 5 %.
2012, 42(6): 102-105,147.
doi: 10.13204/j.gyjz201206022
Abstract:
In order to study the characters of seismic response of masonry pagoda under the interaction of soil andIn order to study the characters of seismic response of masonry pagoda under the interaction of soil andstructure, to refer to seismic reinforcement to masonry pagoda, artifical boundary conditions ware set up, and thecalculation model which included interaction system of soil and structure of Xuanzhuang Pagoda in Xingjiao Temple inXi' an, Shaanxi Province was established. Under three dimension earthquake waves, the seismic response analysiswas done by time history analysis method. The follows were indicated by calculation results that the maximum value ofhorizontal stress, the vertical stress and the axial stress of the tower were located in the mid of the structure. And thestory drift in the mid and top of the structure was larger than the other and the maximum value was in the mid.Therefore, the mid story and top story were critical seismic sections of masonry pagoda.structure, to refer to seismic reinforcement to masonry pagoda, artifical boundary conditions ware set up, and the calculation model which included interaction system of soil and structure of Xuanzhuang Pagoda in Xingjiao Temple in Xi' an, Shaanxi Province was established. Under three dimension earthquake waves, the seismic response analysis was done by time history analysis method. The follows were indicated by calculation results that the maximum value of horizontal stress, the vertical stress and the axial stress of the tower were located in the mid of the structure. And the story drift in the mid and top of the structure was larger than the other and the maximum value was in the mid. Therefore, the mid story and top story were critical seismic sections of masonry pagoda.
In order to study the characters of seismic response of masonry pagoda under the interaction of soil andIn order to study the characters of seismic response of masonry pagoda under the interaction of soil andstructure, to refer to seismic reinforcement to masonry pagoda, artifical boundary conditions ware set up, and thecalculation model which included interaction system of soil and structure of Xuanzhuang Pagoda in Xingjiao Temple inXi' an, Shaanxi Province was established. Under three dimension earthquake waves, the seismic response analysiswas done by time history analysis method. The follows were indicated by calculation results that the maximum value ofhorizontal stress, the vertical stress and the axial stress of the tower were located in the mid of the structure. And thestory drift in the mid and top of the structure was larger than the other and the maximum value was in the mid.Therefore, the mid story and top story were critical seismic sections of masonry pagoda.structure, to refer to seismic reinforcement to masonry pagoda, artifical boundary conditions ware set up, and the calculation model which included interaction system of soil and structure of Xuanzhuang Pagoda in Xingjiao Temple in Xi' an, Shaanxi Province was established. Under three dimension earthquake waves, the seismic response analysis was done by time history analysis method. The follows were indicated by calculation results that the maximum value of horizontal stress, the vertical stress and the axial stress of the tower were located in the mid of the structure. And the story drift in the mid and top of the structure was larger than the other and the maximum value was in the mid. Therefore, the mid story and top story were critical seismic sections of masonry pagoda.
STUDY ON RHEOLOGICAL DIACHRONIC PROPERTY CONSIDERING STRUCTURAL CHARACTERISTICS OF SOFT DREDGER FILL
2012, 42(6): 106-111,37.
doi: 10.13204/j.gyjz201206023
Abstract:
Based on undisturbed and remolded samples as test materials, triaxial rheometer was used to studyrheological diachronic characteristics of soft dredger fill. The results showed that the structure affected rheologicalproperties significantly. Because of structure, the undisturbed soil rheological damage peak was higher than that ofremolded soil. When the stress was lower than yield stress, the stable time of rheology of the undisturbed soil was lessthan remolded soil due to the structure' s resistance to deformation. When the stress was higher than yield stress,along with structural damage, its rheological duration characteristics gradually tended to the ones of the remolded soil,eventually to the same.
Based on undisturbed and remolded samples as test materials, triaxial rheometer was used to studyrheological diachronic characteristics of soft dredger fill. The results showed that the structure affected rheologicalproperties significantly. Because of structure, the undisturbed soil rheological damage peak was higher than that ofremolded soil. When the stress was lower than yield stress, the stable time of rheology of the undisturbed soil was lessthan remolded soil due to the structure' s resistance to deformation. When the stress was higher than yield stress,along with structural damage, its rheological duration characteristics gradually tended to the ones of the remolded soil,eventually to the same.
2012, 42(6): 112-116.
doi: 10.13204/j.gyjz201206024
Abstract:
By the site test of soil nailing tensile force in the soil nailing retaining wall of the International TobaccoBuilding in Longyang of Fujian, the distribution of soil nailing tensile fore was researched. The investigated resultsshowed that the maximum tensile force of soil nails appeared at the middle part, the smaller tensile force appeared atthe top part and the bottom part of retaining wall. The maximum tensile force emerged at the distance of 2 meters fromthe surface of retaining wall, which was in accordance with potential slip surface. The tensile force of soil nails hadtime effect, increasing with time flowing and excavating, and gradually tended to stable at a period of time afterfinishing excavation. In orde to put into full play of the soil nailing retaining wall, the soil nails should be constructedas quickly as possible.
By the site test of soil nailing tensile force in the soil nailing retaining wall of the International TobaccoBuilding in Longyang of Fujian, the distribution of soil nailing tensile fore was researched. The investigated resultsshowed that the maximum tensile force of soil nails appeared at the middle part, the smaller tensile force appeared atthe top part and the bottom part of retaining wall. The maximum tensile force emerged at the distance of 2 meters fromthe surface of retaining wall, which was in accordance with potential slip surface. The tensile force of soil nails hadtime effect, increasing with time flowing and excavating, and gradually tended to stable at a period of time afterfinishing excavation. In orde to put into full play of the soil nailing retaining wall, the soil nails should be constructedas quickly as possible.
2012, 42(6): 117-121.
doi: 10.13204/j.gyjz201206025
Abstract:
The resonance compaction method (MRC ) , using high frequency hydraulic vibratory hammer and MRCcompaction probe, is one of the most efficient way of vibratory compaction method for deep granular soils. The probeis oscillated in the vertical direction and the vibration energy is transmitted to the surrounding soil along the entireprobe surface. Then soils compaction is caused by vertically polarized shear waves. In the paper, mechanism of highfrequency deep vibratory compaction method for deep granular soil densification was studied. Mitchell' s method,which classified soils with respect to the grain size distribution, and Massarsch' s method based on the conepenetration test, were modified to preferably assess the compactability of deep granular soil. The design method ofconstruction scheme was put forward for MRC.
The resonance compaction method (MRC ) , using high frequency hydraulic vibratory hammer and MRCcompaction probe, is one of the most efficient way of vibratory compaction method for deep granular soils. The probeis oscillated in the vertical direction and the vibration energy is transmitted to the surrounding soil along the entireprobe surface. Then soils compaction is caused by vertically polarized shear waves. In the paper, mechanism of highfrequency deep vibratory compaction method for deep granular soil densification was studied. Mitchell' s method,which classified soils with respect to the grain size distribution, and Massarsch' s method based on the conepenetration test, were modified to preferably assess the compactability of deep granular soil. The design method ofconstruction scheme was put forward for MRC.
2012, 42(6): 122-126.
doi: 10.13204/j.gyjz201206026
Abstract:
The complete stress-strain curves of concrete prism specimens were obtained by the rigid supporttechnique. The compressive behaviors of concrete prisms with different strength levels and specimen sizes wereanalyzed. Based on the test results, the size effect of several mechanical parameters including concrete prismaticcompressive strength, peak strain, ultimate strain and elastic modulus was investigated. Also the size conversionfactor of these mechanical parameters was proposed.
The complete stress-strain curves of concrete prism specimens were obtained by the rigid supporttechnique. The compressive behaviors of concrete prisms with different strength levels and specimen sizes wereanalyzed. Based on the test results, the size effect of several mechanical parameters including concrete prismaticcompressive strength, peak strain, ultimate strain and elastic modulus was investigated. Also the size conversionfactor of these mechanical parameters was proposed.
2012, 42(6): 127-130.
doi: 10.13204/j.gyjz201206027
Abstract:
Four groups of high performance concretes were designed, in which the content of pumice and zeolite wasdifferent, and twelve specimens were produced for each group. Three specimens had been eroded in lime saturatedwater, three in MgSO 4 solution, and three in NaCl solution for two years. Then the freezing and thawing experimenton them was done. In the experiment, the change of weight and compressive strength of high performance concretewhich had been eroded in different salification solutions was studied, meanwhile, the effects of different mineraladmixture on salification erosion resistance durability of high performance concrete were analyzed. The tests resultsshow that MgSO4solution' s erosion of high performance concrete is severer than NaCl solution, besides, salificationerosion resistance durability of high performance concrete with pumice and zeolite is good, and it increase with theincrease of zeolite content in high performance concrete.
Four groups of high performance concretes were designed, in which the content of pumice and zeolite wasdifferent, and twelve specimens were produced for each group. Three specimens had been eroded in lime saturatedwater, three in MgSO 4 solution, and three in NaCl solution for two years. Then the freezing and thawing experimenton them was done. In the experiment, the change of weight and compressive strength of high performance concretewhich had been eroded in different salification solutions was studied, meanwhile, the effects of different mineraladmixture on salification erosion resistance durability of high performance concrete were analyzed. The tests resultsshow that MgSO4solution' s erosion of high performance concrete is severer than NaCl solution, besides, salificationerosion resistance durability of high performance concrete with pumice and zeolite is good, and it increase with theincrease of zeolite content in high performance concrete.
2012, 42(6): 131-136,45.
doi: 10.13204/j.gyjz201206028
Abstract:
As a new type of slope stability analysis, the limit equilibrium method by modifying normal stresses overslip surface has a distinct advantage. The research results were analyzed and summarized in detail based on previouswork, which were classified into three kinds: established and completed the basic theory, two-dimensional and threedimensional limit equilibrium method, and some typical engineering applications. This paper also reviewed stabilityanalysis of slope reinforced, 3D back analysis on shear strength parameters of slip soil, stability analysis of 3D slopeunder earthquake action, and analysis of three-dimensional end effects of slopes, which based on the basic concept ofthe limit equilibrium method by modifying normal stresses over slip surface. Finally, some deficiencies in this studywere discussed and suggestions were made for the further studies.
As a new type of slope stability analysis, the limit equilibrium method by modifying normal stresses overslip surface has a distinct advantage. The research results were analyzed and summarized in detail based on previouswork, which were classified into three kinds: established and completed the basic theory, two-dimensional and threedimensional limit equilibrium method, and some typical engineering applications. This paper also reviewed stabilityanalysis of slope reinforced, 3D back analysis on shear strength parameters of slip soil, stability analysis of 3D slopeunder earthquake action, and analysis of three-dimensional end effects of slopes, which based on the basic concept ofthe limit equilibrium method by modifying normal stresses over slip surface. Finally, some deficiencies in this studywere discussed and suggestions were made for the further studies.
2012, 42(6): 137-141.
doi: 10.13204/j.gyjz201206029
Abstract:
The steel frame-bent structure is the main load-supporting structure in thermal power plants of China,whose structural quality and rigidity are distributed non-uniformly. It is particularly necessary to research earthquakeresistant behavior of this structure. The time history response analysis method was used to study the dynamicproperties, the interlayer deformation and the interlayer shear of steel frame-bent structures of main buildings for largethermal power plant. The results showed that there were many weak parts in the horizontal frame-bent and longitudinalframe-supporting structures, which must be strengthened when designed. The space model should be used to considerthe effect of torsion in structural calculation and analysis.
The steel frame-bent structure is the main load-supporting structure in thermal power plants of China,whose structural quality and rigidity are distributed non-uniformly. It is particularly necessary to research earthquakeresistant behavior of this structure. The time history response analysis method was used to study the dynamicproperties, the interlayer deformation and the interlayer shear of steel frame-bent structures of main buildings for largethermal power plant. The results showed that there were many weak parts in the horizontal frame-bent and longitudinalframe-supporting structures, which must be strengthened when designed. The space model should be used to considerthe effect of torsion in structural calculation and analysis.
2012, 42(6): 142-147.
doi: 10.13204/j.gyjz201206030
Abstract:
Cold-formed steel box shape section has the special features both its mass center and moment center beingunified as double symmetry section and its outstanding advantage in moment and torsion rigidity. This paper presentsa new kind of cold-formed steel box shape composite sections, that is flanges opposite being welded to form acomposite section DS. The mechanical properties such as buckling modes, load carrying capacity, rigidity, ductilityand correlation curves of new section members subjected to axial compression, flexure, combined compression andbending were analyzed by using nonlinear finite element method. The consumed steel quantities of per unit loadcarrying capacity between new section members and the same section dimensions of cold-formed C-section memberswere also compared systematically. Some conclusions could be drawn from above work that the DS section membershad some superiority properties such as higher load carrying capacity and section modulus especially subject tocompression load, sufficient section stiffener and difficult for the sub element local buckling to happen and so on.They were very suitable to carry compression, and flexure loads, and combined compression and bending load, too.The consumed steel quantities were almost 50% as the same dimension C-section compression members. The DSsection members could go deep into the experiment study as to be used in the practical projects.
Cold-formed steel box shape section has the special features both its mass center and moment center beingunified as double symmetry section and its outstanding advantage in moment and torsion rigidity. This paper presentsa new kind of cold-formed steel box shape composite sections, that is flanges opposite being welded to form acomposite section DS. The mechanical properties such as buckling modes, load carrying capacity, rigidity, ductilityand correlation curves of new section members subjected to axial compression, flexure, combined compression andbending were analyzed by using nonlinear finite element method. The consumed steel quantities of per unit loadcarrying capacity between new section members and the same section dimensions of cold-formed C-section memberswere also compared systematically. Some conclusions could be drawn from above work that the DS section membershad some superiority properties such as higher load carrying capacity and section modulus especially subject tocompression load, sufficient section stiffener and difficult for the sub element local buckling to happen and so on.They were very suitable to carry compression, and flexure loads, and combined compression and bending load, too.The consumed steel quantities were almost 50% as the same dimension C-section compression members. The DSsection members could go deep into the experiment study as to be used in the practical projects.
2012, 42(6): 148-152.
doi: 10.13204/j.gyjz201206031
Abstract:
The fire resistance behaviour and design of concrete-filled SHS(square hollow sections) columns are oneof the key issues in practice, thus many researchers abroad and at home are concerned with this field. Previousresearch and codes are based essentially on a four-side heated boundary hypothesis. However, concrete-filled SHScolumns may be exposure to non-uniform fires, including one-side fire, two adjacent sides fire and three-side fire.There are different fire resistance behaviors between non-uniform fire conditions from four-side fire condition. Theresearch herein focuses on one of the non-uniform fire types-two-opposite-side fire, to study the fire resistance ofconcrete filled SHS. Based on parametric analysis, simplified calculation formula for predicting the residual loadbearing capacity was deduced through massive calculation and the formula is expected to be used in the design of thefire resistance of the concrete-filled SHS being exposure to two-opposite-side fire.
The fire resistance behaviour and design of concrete-filled SHS(square hollow sections) columns are oneof the key issues in practice, thus many researchers abroad and at home are concerned with this field. Previousresearch and codes are based essentially on a four-side heated boundary hypothesis. However, concrete-filled SHScolumns may be exposure to non-uniform fires, including one-side fire, two adjacent sides fire and three-side fire.There are different fire resistance behaviors between non-uniform fire conditions from four-side fire condition. Theresearch herein focuses on one of the non-uniform fire types-two-opposite-side fire, to study the fire resistance ofconcrete filled SHS. Based on parametric analysis, simplified calculation formula for predicting the residual loadbearing capacity was deduced through massive calculation and the formula is expected to be used in the design of thefire resistance of the concrete-filled SHS being exposure to two-opposite-side fire.
2012, 42(6): 153-157,33.
doi: 10.13204/j.gyjz201206032
Abstract:
Effect of restraints on post-fire mechanical property of three restrained H-steel columns was studied basedon experimental investigation of the H-steel columns after exposure to fire. The restraints applied to the top of thesteel columns considered here were symmetrical restraint to top end of the column, unsymmetrical restraint and freedeformation. The fire and post-fire experiment results show that temperature rise and cooling of the steel columns arebehind variation of furnace temperature, the H-steel column after exposure to fire has higher axial compressive bearingcapacity and the final failure of the steel column is accompanied with the local buckling of flanges and web of thecolumn, and the post-fire mechanical property of the H-steel columns after exposure to fire is obviously affected by therestraints on top of the steel columns. It is typically shown that the post-fire longitudinal strain of the cross section ofthe steel column with symmetrical restraint is evidently different from that of the column with unsymmetrical restraint,and the stiffness of the column with unsymmetrical restraint, which is prior to the column' s buckling, is much largerthan that of the column with symmetrical restraint. It is seen that the bending curve of the H-steel columns indirection of weak-axis is S-type, which is more evident for the steel column with symmetrical restraint and that withoutrestraint
Effect of restraints on post-fire mechanical property of three restrained H-steel columns was studied basedon experimental investigation of the H-steel columns after exposure to fire. The restraints applied to the top of thesteel columns considered here were symmetrical restraint to top end of the column, unsymmetrical restraint and freedeformation. The fire and post-fire experiment results show that temperature rise and cooling of the steel columns arebehind variation of furnace temperature, the H-steel column after exposure to fire has higher axial compressive bearingcapacity and the final failure of the steel column is accompanied with the local buckling of flanges and web of thecolumn, and the post-fire mechanical property of the H-steel columns after exposure to fire is obviously affected by therestraints on top of the steel columns. It is typically shown that the post-fire longitudinal strain of the cross section ofthe steel column with symmetrical restraint is evidently different from that of the column with unsymmetrical restraint,and the stiffness of the column with unsymmetrical restraint, which is prior to the column' s buckling, is much largerthan that of the column with symmetrical restraint. It is seen that the bending curve of the H-steel columns indirection of weak-axis is S-type, which is more evident for the steel column with symmetrical restraint and that withoutrestraint
2012, 42(6): 158-160,7.
doi: 10.13204/j.gyjz201206033
Abstract:
A brick-concrete teaching building built in the 1 980s was dangerous. According to current code, the design of anti-seismic reinforcements was carried out. The following reinforcements were done: Adding ferrocement mortar to the wall surface, pouring concrete lamination layer on the precast floor, and connecting new structure with the existing structure.These reinforcement schemes could meet the anti-seismic requirements of current code, mprove the bearing capacity of the structure.The results showed the rationality of the reinforcement schemes
A brick-concrete teaching building built in the 1 980s was dangerous. According to current code, the design of anti-seismic reinforcements was carried out. The following reinforcements were done: Adding ferrocement mortar to the wall surface, pouring concrete lamination layer on the precast floor, and connecting new structure with the existing structure.These reinforcement schemes could meet the anti-seismic requirements of current code, mprove the bearing capacity of the structure.The results showed the rationality of the reinforcement schemes
2012, 42(6): 161-164.
doi: 10.13204/j.gyjz201206034
Abstract:
Taking the reform and expansion project of the traditional Chinese medicine hospital buildings in Heyuan City for example, it was explored the representative problems of expansion and reform of basic-level traditional Chinese medicine hospital buildings and environments in Guangdong, and also proposed relevant measures, which provided constructive guideline for the reformation of basic-level Chinese medical cause.
Taking the reform and expansion project of the traditional Chinese medicine hospital buildings in Heyuan City for example, it was explored the representative problems of expansion and reform of basic-level traditional Chinese medicine hospital buildings and environments in Guangdong, and also proposed relevant measures, which provided constructive guideline for the reformation of basic-level Chinese medical cause.
