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2007 Vol. 37, No. 3
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2007, 37(3): 1-4,49.
doi: 10.13204/j.gyjz200703001
Abstract:
According to the deloyment of State Council the demands on greatly developing energy and land saving buildingsand building up a saving society, it should be implemented the standard of building energy -saving 50% all over the country,so as to impel the execution of energy saving 65% standard of urban residetial buildings. Many cities are establishing orhave carried out the dwelling building energy saving 65% standard in China. How could building energy -saving index bechanged into envelope thermal property index? It should be analyzed the situation of existing buildings under energy saving50% standard and be got a reasonable design method to improve energy -saving technology. Combining the situation of thebuildingsin Xi? an, it will be found out the gap between thermal property index of existing buildings and new designstandard, and several mending measures will be proposed.
According to the deloyment of State Council the demands on greatly developing energy and land saving buildingsand building up a saving society, it should be implemented the standard of building energy -saving 50% all over the country,so as to impel the execution of energy saving 65% standard of urban residetial buildings. Many cities are establishing orhave carried out the dwelling building energy saving 65% standard in China. How could building energy -saving index bechanged into envelope thermal property index? It should be analyzed the situation of existing buildings under energy saving50% standard and be got a reasonable design method to improve energy -saving technology. Combining the situation of thebuildingsin Xi? an, it will be found out the gap between thermal property index of existing buildings and new designstandard, and several mending measures will be proposed.
2007, 37(3): 5-9.
doi: 10.13204/j.gyjz200703002
Abstract:
Natural ventilation is a chief strategy that improves indoor thermal environment and indoor air quality. Heatpressure and wind pressure are a basic element causing natural ventilation. It may save energy consumption to lead naturalventilation in buildings. Some measures that caused ventilation in the building indoor were analyzed in order to providedesigning foundation for architects.
Natural ventilation is a chief strategy that improves indoor thermal environment and indoor air quality. Heatpressure and wind pressure are a basic element causing natural ventilation. It may save energy consumption to lead naturalventilation in buildings. Some measures that caused ventilation in the building indoor were analyzed in order to providedesigning foundation for architects.
2007, 37(3): 10-13,25.
doi: 10.13204/j.gyjz200703003
Abstract:
Solar energy using is an important part of world source and sustainable development stratagems. Solar energytechnical applications can relax energy shortage, reduce pollution and emission of carbon dioxide. The through ligh- t heattechnique, hea- t electric technique and natura- l light technique of solar energy, it is summarized overall strategies of solarenergy technique applied in buildings from application principles, status and development.
Solar energy using is an important part of world source and sustainable development stratagems. Solar energytechnical applications can relax energy shortage, reduce pollution and emission of carbon dioxide. The through ligh- t heattechnique, hea- t electric technique and natura- l light technique of solar energy, it is summarized overall strategies of solarenergy technique applied in buildings from application principles, status and development.
2007, 37(3): 14-16,55.
doi: 10.13204/j.gyjz200703004
Abstract:
Adjustable shading can adjust solar radiation through architectural surfaces by changing itself continiously. Thereare three basic forms: shutter, roller blindand sun ?breaker. It is analyzed the basic characteristics of adjustable shading andpointed out that shading form surfacing and shading functional diversification are becoming the current main trend indesigning adjustable shading. A new idea of adjustable shading is also described.
Adjustable shading can adjust solar radiation through architectural surfaces by changing itself continiously. Thereare three basic forms: shutter, roller blindand sun ?breaker. It is analyzed the basic characteristics of adjustable shading andpointed out that shading form surfacing and shading functional diversification are becoming the current main trend indesigning adjustable shading. A new idea of adjustable shading is also described.
2007, 37(3): 17-19.
doi: 10.13204/j.gyjz200703005
Abstract:
Accelerating the construction of residentialsystem anddeveloping energy efficiency buildings in westernregion in China is a significant action to realize overall comparatively good living standard. In rural areas in northwestern China, thecurrent construction materials are mainly clay bricks and the current housings in rural areas are not energy efficient. Itshould be found out a material suited for ruralareas in northwestern China to replace brick as soon as possible. Straw baleconstruction is famous as its energy efficiency. Especially, straw bale is much superior to brick in energy consumptionincluding production consumption, raw material consumption, transport consumption, construction consumption and usingconsumption. Compared with brick, straw bale may save a lot of coal and land, may reduce carbon dioxide and smoke anddust. In addition, there are several beneficial conditions in northwest rural areas to construct straw bale houses.
Accelerating the construction of residentialsystem anddeveloping energy efficiency buildings in westernregion in China is a significant action to realize overall comparatively good living standard. In rural areas in northwestern China, thecurrent construction materials are mainly clay bricks and the current housings in rural areas are not energy efficient. Itshould be found out a material suited for ruralareas in northwestern China to replace brick as soon as possible. Straw baleconstruction is famous as its energy efficiency. Especially, straw bale is much superior to brick in energy consumptionincluding production consumption, raw material consumption, transport consumption, construction consumption and usingconsumption. Compared with brick, straw bale may save a lot of coal and land, may reduce carbon dioxide and smoke anddust. In addition, there are several beneficial conditions in northwest rural areas to construct straw bale houses.
2007, 37(3): 20-22,32.
doi: 10.13204/j.gyjz200703006
Abstract:
It is analysedthe present statusof building energy consumption inHunan, and is also emphasized the importanceof building energy -conserving. According to the climate characteristics of Hunan, it is at last described that thecountermeasures for energy -conservation of walls, doors and windows, roof, etc.
It is analysedthe present statusof building energy consumption inHunan, and is also emphasized the importanceof building energy -conserving. According to the climate characteristics of Hunan, it is at last described that thecountermeasures for energy -conservation of walls, doors and windows, roof, etc.
2007, 37(3): 23-25,13.
doi: 10.13204/j.gyjz200703007
Abstract:
The shape design of a building will affect the building energy -saving. It is pointed out that the building shapecoefficient and the surface area coefficient should be controlled or reduced aswell as the obtained heat of daily radiation inbuilding shape design. According to the peculiarity of residential building in Xi. an, it is analyzed the relations amonglength, width and height of 2 000~ 7 000m 2 multiple storey residential building on the principle of shape coefficient ofbuilding S [ 013 according to the suggestions in / Energy Conservation Design Standard for New Heating ResidentialBuilding0, which may be a reference for design of energy saving shape of a building.
The shape design of a building will affect the building energy -saving. It is pointed out that the building shapecoefficient and the surface area coefficient should be controlled or reduced aswell as the obtained heat of daily radiation inbuilding shape design. According to the peculiarity of residential building in Xi. an, it is analyzed the relations amonglength, width and height of 2 000~ 7 000m 2 multiple storey residential building on the principle of shape coefficient ofbuilding S [ 013 according to the suggestions in / Energy Conservation Design Standard for New Heating ResidentialBuilding0, which may be a reference for design of energy saving shape of a building.
2007, 37(3): 26-29.
doi: 10.13204/j.gyjz200703008
Abstract:
In order to research the energy -efficient design of department stores in Chongqing in depth, on the basic ofprophase investigation, anelementary model of department store is set up, and it ismade out four energy -efficient schemesinallusion to exterior wall conformation design by improving heat preservation and insulation, which are respectively comparedwith the actual designof exterior walls. By analyzing the thermal and economic indexes, find out the most effective project,which provides reference to the energy -efficient design of exterior walls of department stores, and offers a feasible method toarchitectural designer dealing with the research on energy -efficient design of a public building.
In order to research the energy -efficient design of department stores in Chongqing in depth, on the basic ofprophase investigation, anelementary model of department store is set up, and it ismade out four energy -efficient schemesinallusion to exterior wall conformation design by improving heat preservation and insulation, which are respectively comparedwith the actual designof exterior walls. By analyzing the thermal and economic indexes, find out the most effective project,which provides reference to the energy -efficient design of exterior walls of department stores, and offers a feasible method toarchitectural designer dealing with the research on energy -efficient design of a public building.
2007, 37(3): 30-32,22.
doi: 10.13204/j.gyjz200703009
Abstract:
At present, energy_saving of urban houses has been concerned fully, but energy_saving and land -saving ofsuburban houses are neglected badly. According to the actuality of suburban houses in a cold district, it is analysed theinshape coefficients, the heat insulations of envelope, the design of windows andusing of solar energy, then some energy_savingmeasures are put forward, which are also evaluated.
At present, energy_saving of urban houses has been concerned fully, but energy_saving and land -saving ofsuburban houses are neglected badly. According to the actuality of suburban houses in a cold district, it is analysed theinshape coefficients, the heat insulations of envelope, the design of windows andusing of solar energy, then some energy_savingmeasures are put forward, which are also evaluated.
2007, 37(3): 33-37.
doi: 10.13204/j.gyjz200703010
Abstract:
The effective torsion section is put forward to reflect the torsion action of the column limb based on the rigiditytheory of transverse torsion member of reinforced concrete flat plate_rectangular column connection and aimed at thecharacteristic of the reinforced concrete flat plate_special_shaped column connection. Because the rigidity of the transversetorsion member is various, the hypothesis is made that the linear torison along transverse torsion member is distributed in twodifferent slant lines. The theory expression of transverse torsion member is derived. By the finite element procedure ANSYS,the effective range of the special_shaped column limb contributed to the torsion rigidity is confirmed and the rigidities oftransverse torsion members are evaluated according to different factors.The analysis result also shows that the height of theeffective column limb is equal to the thickness of the flat plate. The trends of rigidities obtained by the finite element methodagree wellwith those of the theory expression method.The theory expression of transverse torsion member can be applied toequivalent column method to analyze the behavior of reinforced concrete flat plate_special_shaped column structural system.
The effective torsion section is put forward to reflect the torsion action of the column limb based on the rigiditytheory of transverse torsion member of reinforced concrete flat plate_rectangular column connection and aimed at thecharacteristic of the reinforced concrete flat plate_special_shaped column connection. Because the rigidity of the transversetorsion member is various, the hypothesis is made that the linear torison along transverse torsion member is distributed in twodifferent slant lines. The theory expression of transverse torsion member is derived. By the finite element procedure ANSYS,the effective range of the special_shaped column limb contributed to the torsion rigidity is confirmed and the rigidities oftransverse torsion members are evaluated according to different factors.The analysis result also shows that the height of theeffective column limb is equal to the thickness of the flat plate. The trends of rigidities obtained by the finite element methodagree wellwith those of the theory expression method.The theory expression of transverse torsion member can be applied toequivalent column method to analyze the behavior of reinforced concrete flat plate_special_shaped column structural system.
2007, 37(3): 38-41,71.
doi: 10.13204/j.gyjz200703011
Abstract:
Using the software of ANSYS, it was carried out nonlinear finite element analysis upon the basic behavior of high-strength concrete shear wall subjected to monodirectional lateral load. Considering the characteristic of high?strengthconcrete, the effect of concrete' s craze and the stress-softening after the concrete crushing, the problem of falling branchwas solved comparatively well with displacement-controlled manner. Analytical load -displacement curves were found in agood agreement with the test results. Focused on factorswhich influence basic behavior such as concrete grades, the ratio ofboundary longitudinal reinforcement to boundary element, the volumetric ratio of transverse reinforcement at the boundaryelement, the ratio of web vertical reinforcement, the ratio of web horizontal reinforcement and axial load ratio, it was alsodiscussed their changing rules, and brought forward some suggestions to guarantee the basic behavior of high?strengthconcrete shear wall.
Using the software of ANSYS, it was carried out nonlinear finite element analysis upon the basic behavior of high-strength concrete shear wall subjected to monodirectional lateral load. Considering the characteristic of high?strengthconcrete, the effect of concrete' s craze and the stress-softening after the concrete crushing, the problem of falling branchwas solved comparatively well with displacement-controlled manner. Analytical load -displacement curves were found in agood agreement with the test results. Focused on factorswhich influence basic behavior such as concrete grades, the ratio ofboundary longitudinal reinforcement to boundary element, the volumetric ratio of transverse reinforcement at the boundaryelement, the ratio of web vertical reinforcement, the ratio of web horizontal reinforcement and axial load ratio, it was alsodiscussed their changing rules, and brought forward some suggestions to guarantee the basic behavior of high?strengthconcrete shear wall.
2007, 37(3): 42-45.
doi: 10.13204/j.gyjz200703012
Abstract:
Cast-in -place continuous RC crane girder has beenwidely used in south area of China. According to the lack ofcode and specification for design at present, a simple and practical method is proposed; and some problems with regard tocalculation and construction are reaserched, which may be used for structural design of cast?in ?place continuous RC cranegirder.
Cast-in -place continuous RC crane girder has beenwidely used in south area of China. According to the lack ofcode and specification for design at present, a simple and practical method is proposed; and some problems with regard tocalculation and construction are reaserched, which may be used for structural design of cast?in ?place continuous RC cranegirder.
2007, 37(3): 46-49,4.
doi: 10.13204/j.gyjz200703013
Abstract:
Under the horizontal earthquake action, the jointed region of a pipe pile with base platform subjected to largemoment and shear force. According to the technical standard of prestressed concrete pipe pile, the reinforced concrete arefilled in the upper pile for one meter to improve the ductility and enhance bearing capacity. But the bearing capacity andductility of filled prestressed concrete pipe pile are rarely known upto now. Two specimens were tested in low_cycle reverseloads to investigate the momen bearing capacity and ductility performance for both filled pile and unfilled one. The tests showthatthe ductility factor of section and the moment bearing capacity of the filled pipe pile have larger improvement ascompared with those of the unfilled one.
Under the horizontal earthquake action, the jointed region of a pipe pile with base platform subjected to largemoment and shear force. According to the technical standard of prestressed concrete pipe pile, the reinforced concrete arefilled in the upper pile for one meter to improve the ductility and enhance bearing capacity. But the bearing capacity andductility of filled prestressed concrete pipe pile are rarely known upto now. Two specimens were tested in low_cycle reverseloads to investigate the momen bearing capacity and ductility performance for both filled pile and unfilled one. The tests showthatthe ductility factor of section and the moment bearing capacity of the filled pipe pile have larger improvement ascompared with those of the unfilled one.
2007, 37(3): 50-55,16.
doi: 10.13204/j.gyjz200703014
Abstract:
Based on the experimental investigations of three thick six_pile cap specimens and finite element computations,the load_transferred mechanism andthe failure modes are analyzed, and the effect of different steel bar arrangements on theultimate bearing capacity of thick six_pile caps are thus discussed. The results show that the load_transferred path of thicksix_pile cap is well correlated with the three_dimensional arch_and_tie model.
Based on the experimental investigations of three thick six_pile cap specimens and finite element computations,the load_transferred mechanism andthe failure modes are analyzed, and the effect of different steel bar arrangements on theultimate bearing capacity of thick six_pile caps are thus discussed. The results show that the load_transferred path of thicksix_pile cap is well correlated with the three_dimensional arch_and_tie model.
2007, 37(3): 56-59,94.
doi: 10.13204/j.gyjz200703015
Abstract:
Basedon single permeable boundary condition of stone columns composite foundation, the dynamic pore pressureincreasing ratio as force source is expressed as the function of depth and time, the general analytic solution of generation anddissipation of excess pore water pressure in stone columns composite foundation is developed under seismic loading. Basedon some existing dynamic pore pressure calculation models, the specific analytic solution is developed and analytic solutionof dissipation of residual pore water pressure is developed.
Basedon single permeable boundary condition of stone columns composite foundation, the dynamic pore pressureincreasing ratio as force source is expressed as the function of depth and time, the general analytic solution of generation anddissipation of excess pore water pressure in stone columns composite foundation is developed under seismic loading. Basedon some existing dynamic pore pressure calculation models, the specific analytic solution is developed and analytic solutionof dissipation of residual pore water pressure is developed.
2007, 37(3): 60-65.
doi: 10.13204/j.gyjz200703016
Abstract:
The relative researches are carried out with a case of cut slope treatment engineering of expansive soils. It isinvolved that the shoring idea of expansive soils slope, the strength value of expansive soils, the slope stability analysis andits optimizing design, the technics of anchor bar with expanding root and its test study, the protection of sloping surface, andso on. And the anchor bar with expanding root test study indicated in expansive soils area that anchorage forces of theexpanding roots are not obviously different from the those of non_expanding roots when the tests has been done beforeraining, but after raining the non_expanding roots. anchorage force will decrease to a large extent but the expanding roots.decreasing extent is little. Such data indicates that the applications of anchored bars with expanding roots in expansive soilsare successful.
The relative researches are carried out with a case of cut slope treatment engineering of expansive soils. It isinvolved that the shoring idea of expansive soils slope, the strength value of expansive soils, the slope stability analysis andits optimizing design, the technics of anchor bar with expanding root and its test study, the protection of sloping surface, andso on. And the anchor bar with expanding root test study indicated in expansive soils area that anchorage forces of theexpanding roots are not obviously different from the those of non_expanding roots when the tests has been done beforeraining, but after raining the non_expanding roots. anchorage force will decrease to a large extent but the expanding roots.decreasing extent is little. Such data indicates that the applications of anchored bars with expanding roots in expansive soilsare successful.
2007, 37(3): 66-71,41.
doi: 10.13204/j.gyjz200703017
Abstract:
The application of artificial neural networks (ANNs) to predict the ultimate bond strengths of CFRP bonded toconcrete is investigated. An ANN model is built, trained and tested using 118 sets of test data collected from the technicalliteratures. The data used in the ANN model are arranged in a format of 8 input parameters that cover the compressivestrength, tensile strength andwidth of cube concrete; the thickness, the width, the bond length and the elastic modulus ofthe CFRP plate. 15 sets of experimental data are usedfor predicting. The results predicted by the ANN model are comparedwith those obtained by 4 empirical equations. The results show that ANN is a feasible tool for predicting the ultimate bondstrengths of CFRP bonded to concrete.
The application of artificial neural networks (ANNs) to predict the ultimate bond strengths of CFRP bonded toconcrete is investigated. An ANN model is built, trained and tested using 118 sets of test data collected from the technicalliteratures. The data used in the ANN model are arranged in a format of 8 input parameters that cover the compressivestrength, tensile strength andwidth of cube concrete; the thickness, the width, the bond length and the elastic modulus ofthe CFRP plate. 15 sets of experimental data are usedfor predicting. The results predicted by the ANN model are comparedwith those obtained by 4 empirical equations. The results show that ANN is a feasible tool for predicting the ultimate bondstrengths of CFRP bonded to concrete.
EXPERIMENTAL ANALYSIS ON PROPERTIES OF HIGH STRENGTH CONCRETE BY USE OF BLAST FURNACE SLAG AGGREGATE
2007, 37(3): 72-74,116.
doi: 10.13204/j.gyjz200703018
Abstract:
Blast furnace slag aggregates (BFSA) were used to produce high -strength concretes (HSC) . Different water-binder ratios ( 0.30, 0.35, 0.40, 0.45 and 0.50) were used to do tests of 7-day and28?day compressive strength and otherproperties of conventional (reference) concrete and BFSA concrete. Super -plasticizer and 10% silica fume were used toimprove BFSA concretes. Slump was kept constant throughout this study. It concluded that compressive strength of BFSAconcretes are approximately 26%~ 87% higher than reference concretes for different water ?binder ratios. These concretesalso have lower water absorption, higher splitting tensile strength and lower brittleness.
Blast furnace slag aggregates (BFSA) were used to produce high -strength concretes (HSC) . Different water-binder ratios ( 0.30, 0.35, 0.40, 0.45 and 0.50) were used to do tests of 7-day and28?day compressive strength and otherproperties of conventional (reference) concrete and BFSA concrete. Super -plasticizer and 10% silica fume were used toimprove BFSA concretes. Slump was kept constant throughout this study. It concluded that compressive strength of BFSAconcretes are approximately 26%~ 87% higher than reference concretes for different water ?binder ratios. These concretesalso have lower water absorption, higher splitting tensile strength and lower brittleness.
2007, 37(3): 75-80,113.
doi: 10.13204/j.gyjz200703019
Abstract:
A test on eight specimens of rectangle concrete filled steel tubular ( R -CFT) stub columns, including onespecimen without binding bars and seven specimenswith binding bars, is carried out, aiming at axially -loaded behavior ofR -CFT influenced by binding bars. The primary study parameters are diameter and space of binding bar, width -thicknessratio of steel tube and length-width ratio of specimen cross-section. It is shown that the binding bars do enhance ductility anddeformability of R -CFT, though not contributing to the ultimate bearing capacity of R -CFT. Finally, a comparison betweenthe ultimate bearing capacity, calculated by the current methods at home and that of EC4(1996) respectively, and thecounterpart of experiment results is conducted, which shows that the results of calculation are conservative.
A test on eight specimens of rectangle concrete filled steel tubular ( R -CFT) stub columns, including onespecimen without binding bars and seven specimenswith binding bars, is carried out, aiming at axially -loaded behavior ofR -CFT influenced by binding bars. The primary study parameters are diameter and space of binding bar, width -thicknessratio of steel tube and length-width ratio of specimen cross-section. It is shown that the binding bars do enhance ductility anddeformability of R -CFT, though not contributing to the ultimate bearing capacity of R -CFT. Finally, a comparison betweenthe ultimate bearing capacity, calculated by the current methods at home and that of EC4(1996) respectively, and thecounterpart of experiment results is conducted, which shows that the results of calculation are conservative.
2007, 37(3): 81-85,65.
doi: 10.13204/j.gyjz200703020
Abstract:
It was performed nonlinear finite element analysis for K shape eccentrically braced steel frames on differentlength of link beam. Analysis indicates that the strength, rigidity, ductility and energy -dissipation performance of K shapeeccentrically braced steel frames deteriorate differently with the length increase of link beam. The shorter the link beam is,the larger plastic deformation of it, so itmakes plastic collapse easily, while a long link beam has a poor cyclic behavior. Atthe end of this paper, suggestions on design of the length of link beam based on finite element simulation results arepresented.
It was performed nonlinear finite element analysis for K shape eccentrically braced steel frames on differentlength of link beam. Analysis indicates that the strength, rigidity, ductility and energy -dissipation performance of K shapeeccentrically braced steel frames deteriorate differently with the length increase of link beam. The shorter the link beam is,the larger plastic deformation of it, so itmakes plastic collapse easily, while a long link beam has a poor cyclic behavior. Atthe end of this paper, suggestions on design of the length of link beam based on finite element simulation results arepresented.
2007, 37(3): 86-89,29.
doi: 10.13204/j.gyjz200703021
Abstract:
It is introduced the renovation of the No. 4 blast _ furnace wall of TaiyuanSteel and IronCorporation. Temperatureof the blast-furnace wall is too high for some technical causes. To cool it a great numbers of holes have to be drilled at thelower blast-furnace wall to install water -cooled pipes.The difficulty is that there is only 260 mm in distance between theexisting two rows of pipes. It is also shown a practical calculating methodfor aseismic bearing capacity of blast -furnace wall.The example of strength check computation and strengthening design are also introduced, which may be a reference forsimilar engineering inmetallurgical factories.
It is introduced the renovation of the No. 4 blast _ furnace wall of TaiyuanSteel and IronCorporation. Temperatureof the blast-furnace wall is too high for some technical causes. To cool it a great numbers of holes have to be drilled at thelower blast-furnace wall to install water -cooled pipes.The difficulty is that there is only 260 mm in distance between theexisting two rows of pipes. It is also shown a practical calculating methodfor aseismic bearing capacity of blast -furnace wall.The example of strength check computation and strengthening design are also introduced, which may be a reference forsimilar engineering inmetallurgical factories.
2007, 37(3): 90-94,59.
doi: 10.13204/j.gyjz200703022
Abstract:
Based on twenty specimens with concrete strength varied from 65. 3MPa to 84. 9MPa subjected to constant axialcompression force and horizontal load, the shear performance of steel reinforced high -strength concrete columns is studied.Four factors, that is shear span ratio, axial compression ratio, stirrup ratio and grade of concrete strength, are taken intoconsideration. Failure patterns of specimens are obtained and it is analyzed the influence of shear span ratio, axialcompression ratio, stirrup ratio and grade of concrete strength on shear performance of steel reinforced high -strengthcolumns. A calculating formula for shear bearing capacity of steel reinforced high -strength columns is presented. Thisformula is consistent with the formula for shear strength in the current code ( GB 50010 -2002) , whose calculating resultstend to be safe.
Based on twenty specimens with concrete strength varied from 65. 3MPa to 84. 9MPa subjected to constant axialcompression force and horizontal load, the shear performance of steel reinforced high -strength concrete columns is studied.Four factors, that is shear span ratio, axial compression ratio, stirrup ratio and grade of concrete strength, are taken intoconsideration. Failure patterns of specimens are obtained and it is analyzed the influence of shear span ratio, axialcompression ratio, stirrup ratio and grade of concrete strength on shear performance of steel reinforced high -strengthcolumns. A calculating formula for shear bearing capacity of steel reinforced high -strength columns is presented. Thisformula is consistent with the formula for shear strength in the current code ( GB 50010 -2002) , whose calculating resultstend to be safe.
2007, 37(3): 95-97,101.
doi: 10.13204/j.gyjz200703023
Abstract:
According to the ful- l scale test of folding space reticulated shell designed by an institute, the procedure ofdeformation and failure mechanism of this structure are discovered, and the rationality of the design of this sort of structurehas been verified.
According to the ful- l scale test of folding space reticulated shell designed by an institute, the procedure ofdeformation and failure mechanism of this structure are discovered, and the rationality of the design of this sort of structurehas been verified.
2007, 37(3): 98-101,97.
doi: 10.13204/j.gyjz200703024
Abstract:
The requirements for allowable stress design of masonry were retained ane strength design provisions were firstincluded in the American Building Code Requirements for Masonry Structures( ACI 530-02 ASCE 5-02 TMS 402-02)in the 2002 edition. Allowable stress and strength design method for bending members are briefly compared and introducedin this paper. The purpose is knowing more about building code for masonry structures in the United States. This will behelpful to compiling new design code for masonry and enhance development of building code of masonry structures in China
The requirements for allowable stress design of masonry were retained ane strength design provisions were firstincluded in the American Building Code Requirements for Masonry Structures( ACI 530-02 ASCE 5-02 TMS 402-02)in the 2002 edition. Allowable stress and strength design method for bending members are briefly compared and introducedin this paper. The purpose is knowing more about building code for masonry structures in the United States. This will behelpful to compiling new design code for masonry and enhance development of building code of masonry structures in China
2007, 37(3): 102-105,122.
doi: 10.13204/j.gyjz200703025
Abstract:
Several strengthening materials could be added to CFRP -strengthening system because of the excellentcharacteristics of CFRP sheets and three strengthening schemes of beam -column joints based on CFRP sheets are put forwardto upgrade the seismic behavior of those under designed RC frames. Based on the quas- i static test of six exterior RC beam-column joints, the effectiveness of the schemes was examined in aspect of failure modes, hysteretic response, sheardeformation of joint cores, strength degradation, stiffness degradation and energy dissipation capacity.
Several strengthening materials could be added to CFRP -strengthening system because of the excellentcharacteristics of CFRP sheets and three strengthening schemes of beam -column joints based on CFRP sheets are put forwardto upgrade the seismic behavior of those under designed RC frames. Based on the quas- i static test of six exterior RC beam-column joints, the effectiveness of the schemes was examined in aspect of failure modes, hysteretic response, sheardeformation of joint cores, strength degradation, stiffness degradation and energy dissipation capacity.
2007, 37(3): 106-110,119.
doi: 10.13204/j.gyjz200703026
Abstract:
Rehabilitation of RC members with stainless steel wire mesh and permeability polymer mortar is a new method ofstructural strengthening with the advantages of resistance to fire, corrosion and ageing. Experiments were conducted toinvestigate the flexural behavior of four strengthened RC T -beams and one comparative RC T -beam under different types ofloadings, the T -beamswere a reduced scale model of a bridge located in Cangzhou City of Hebei Province. It was analyzedthe influence factors of the strengthened T -beams. flexural bearing capacity and its failure modes. Based on the test results,the design formulae of flexural bearing capacity were proposed.
Rehabilitation of RC members with stainless steel wire mesh and permeability polymer mortar is a new method ofstructural strengthening with the advantages of resistance to fire, corrosion and ageing. Experiments were conducted toinvestigate the flexural behavior of four strengthened RC T -beams and one comparative RC T -beam under different types ofloadings, the T -beamswere a reduced scale model of a bridge located in Cangzhou City of Hebei Province. It was analyzedthe influence factors of the strengthened T -beams. flexural bearing capacity and its failure modes. Based on the test results,the design formulae of flexural bearing capacity were proposed.
2007, 37(3): 111-113,80.
doi: 10.13204/j.gyjz200703027
Abstract:
Through the strengthening project of the teaching and experimental building' s wood-roof of a university inHarbin, it is introduced that some usual damage phenomenon and reinforcing methods of wood structures.
Through the strengthening project of the teaching and experimental building' s wood-roof of a university inHarbin, it is introduced that some usual damage phenomenon and reinforcing methods of wood structures.
2007, 37(3): 114-116,74.
doi: 10.13204/j.gyjz200703028
Abstract:
Through one example of frame structure reconstruction engineering, this paper presented the design idea of usingthe welded H -beam as underpinning beam which includes the design of the joint, the loading device and the section of thesteel beam. It is also analysed the detection data in the construction in order to validate this blueprint.
Through one example of frame structure reconstruction engineering, this paper presented the design idea of usingthe welded H -beam as underpinning beam which includes the design of the joint, the loading device and the section of thesteel beam. It is also analysed the detection data in the construction in order to validate this blueprint.
2007, 37(3): 117-119,110.
doi: 10.13204/j.gyjz200703029
Abstract:
It is expounded that the main points of design, construction characteristics and precautions of a PHC pipe pilewhen it is used for a site of backfilled stone layer, according to the design of PHC pipe piles for an industrialmill building.which may be a reference for the same trade.
It is expounded that the main points of design, construction characteristics and precautions of a PHC pipe pilewhen it is used for a site of backfilled stone layer, according to the design of PHC pipe piles for an industrialmill building.which may be a reference for the same trade.
