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2007 Vol. 37, No. 8
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2007, 37(8): 1-4,13.
doi: 10.13204/j.gyjz200708001
Abstract:
For researching the influence of horizontal reinforcement ratio on seismic behavior of steel-concrete beams,experiments are conducted on ten specimens of composite steel-concrete beams under the repeated and cyclic loadings.With the results of these experiments,it is analyzed that breaking appearance,hysteresis curves,ductility and other seismic behavior of steel-concrete beams and written down the time when longitudinal cracking appeared in concrete flange in tension.By researching the experimental results,it is suggested that the rational horizontal reinforcement ratio of steel-concrete beam in positive moment area should be 0.5% to 0.7% and in negative moment area be 0.7% to 0.8%.
For researching the influence of horizontal reinforcement ratio on seismic behavior of steel-concrete beams,experiments are conducted on ten specimens of composite steel-concrete beams under the repeated and cyclic loadings.With the results of these experiments,it is analyzed that breaking appearance,hysteresis curves,ductility and other seismic behavior of steel-concrete beams and written down the time when longitudinal cracking appeared in concrete flange in tension.By researching the experimental results,it is suggested that the rational horizontal reinforcement ratio of steel-concrete beam in positive moment area should be 0.5% to 0.7% and in negative moment area be 0.7% to 0.8%.
2007, 37(8): 5-8.
doi: 10.13204/j.gyjz200708002
Abstract:
The joints of concrete filled steel tube with core steel tube were studied by loading the axial load in the core concrete.The joints were intercepted from the remanent joints specimens.The mechanical properties and the ultimate bearing capacity of the core concrete in multiply confined condition were studied and the constraint action of the joint components to core concrete was analyzed.The test results show that the strength and the deformation capacity of the core concrete are improved greatly.If the ultimate bearing capacity is divided by the area of loading,the compression strength of core concrete can be up to 250 MPa.According to the analyses of the loading-displacement curves and the bearing mechanisms to confined concrete,it proved that the force of friction between the concrete and the steel tube,the vertical force of the steel tube besides the confined concrete,have contribution to the ultimate bearing capacity.
The joints of concrete filled steel tube with core steel tube were studied by loading the axial load in the core concrete.The joints were intercepted from the remanent joints specimens.The mechanical properties and the ultimate bearing capacity of the core concrete in multiply confined condition were studied and the constraint action of the joint components to core concrete was analyzed.The test results show that the strength and the deformation capacity of the core concrete are improved greatly.If the ultimate bearing capacity is divided by the area of loading,the compression strength of core concrete can be up to 250 MPa.According to the analyses of the loading-displacement curves and the bearing mechanisms to confined concrete,it proved that the force of friction between the concrete and the steel tube,the vertical force of the steel tube besides the confined concrete,have contribution to the ultimate bearing capacity.
2007, 37(8): 9-13.
doi: 10.13204/j.gyjz200708003
Abstract:
In order to investigate the actual behavior of stud connectors under monotonic load,10 push-out specimens are proposed.Based on tests of these specimens,failure pattern,shear bearing capacity,relation between load and slip,distortion capacity etc.of stud connector in high performance concrete are discussed in detail.And effects on shear behavior of stud connector,due to concrete type and stud diameter are analyzed.The results show that shear bearing capacity of stud in high performance concrete is almost the same to that in normal concrete,its distortion capacity is preferable,rigidity degeneration is both obviously,and ordinary welding methods are unfavorable.At last,the corresponding design suggestions based on tests and numerical analysis about shear bearing capacity of stud connectors in high performance concrete are put forward.
In order to investigate the actual behavior of stud connectors under monotonic load,10 push-out specimens are proposed.Based on tests of these specimens,failure pattern,shear bearing capacity,relation between load and slip,distortion capacity etc.of stud connector in high performance concrete are discussed in detail.And effects on shear behavior of stud connector,due to concrete type and stud diameter are analyzed.The results show that shear bearing capacity of stud in high performance concrete is almost the same to that in normal concrete,its distortion capacity is preferable,rigidity degeneration is both obviously,and ordinary welding methods are unfavorable.At last,the corresponding design suggestions based on tests and numerical analysis about shear bearing capacity of stud connectors in high performance concrete are put forward.
2007, 37(8): 14-17.
doi: 10.13204/j.gyjz200708004
Abstract:
It was presented an experimental research on 18 reinforced concrete columns strengthened by circular steel jacketing subjected to eccentric loading.It was studied that the mechanical properties of the specimens under different eccentricities and initial eccentric loadings.The experimental results showed that the bearing capacity decreased with the increase of the eccentricities,and the original eccentric loading can be neglected.At the same time,A nonlinear analysis program NU was developed to analyze the mechanical property of specimens.The analysis results were compared with the experimental results,and they agree well with each other.Finally,the formula of the eccentricity influence coefficient e was obtained from the induction of parameter analysis result.The calculative results agree well with those of the experiment,and the value of e was discussed.
It was presented an experimental research on 18 reinforced concrete columns strengthened by circular steel jacketing subjected to eccentric loading.It was studied that the mechanical properties of the specimens under different eccentricities and initial eccentric loadings.The experimental results showed that the bearing capacity decreased with the increase of the eccentricities,and the original eccentric loading can be neglected.At the same time,A nonlinear analysis program NU was developed to analyze the mechanical property of specimens.The analysis results were compared with the experimental results,and they agree well with each other.Finally,the formula of the eccentricity influence coefficient e was obtained from the induction of parameter analysis result.The calculative results agree well with those of the experiment,and the value of e was discussed.
2007, 37(8): 18-21.
doi: 10.13204/j.gyjz200708005
Abstract:
It is provided that elasto-plastic finite element analyses of steel-concrete composite portal frame subjected to lateral loads to study how the crack influence the spatial action of composite floor slabs under plastic condition.Analysis results show that crack does not influence the spatial actions of composite floor slabs too much because of the restriction provided by the reinforce bar in the concrete slabs.
It is provided that elasto-plastic finite element analyses of steel-concrete composite portal frame subjected to lateral loads to study how the crack influence the spatial action of composite floor slabs under plastic condition.Analysis results show that crack does not influence the spatial actions of composite floor slabs too much because of the restriction provided by the reinforce bar in the concrete slabs.
2007, 37(8): 22-24.
doi: 10.13204/j.gyjz200708006
Abstract:
It is studied a steel tube's three-dimensional stress and core's concrete constraint mechanism by plastic mechanical theory.It is also considered that steel tube's three dimensional stress meets R.Von Mises yield condition at plastic stage.Three-dimensional compression of the cure concrete can increase greatly the ultimate bearing capacity.With different core concrete failure criterion,and different results can be got.
It is studied a steel tube's three-dimensional stress and core's concrete constraint mechanism by plastic mechanical theory.It is also considered that steel tube's three dimensional stress meets R.Von Mises yield condition at plastic stage.Three-dimensional compression of the cure concrete can increase greatly the ultimate bearing capacity.With different core concrete failure criterion,and different results can be got.
2007, 37(8): 25-27,21.
doi: 10.13204/j.gyjz200708007
Abstract:
The ultimate bearing capacity of axially compressed expansive concrete-filled steel tube(CFT) short columns with circular section is analyzed using the limit analysis theory.The formula for the ultimate strength of expansive CFT short columns is proposed.Meanwhile,the expansive model of expansive CFT and the initial contact pressure between the tube and the core concrete caused by the expansion of concrete core are investigated.The factors influencing the ultimate bearing capacity of expansive CFT short columns are discussed.The calculated results obtained by the proposed formula are in good agreement with the experimental ones.
The ultimate bearing capacity of axially compressed expansive concrete-filled steel tube(CFT) short columns with circular section is analyzed using the limit analysis theory.The formula for the ultimate strength of expansive CFT short columns is proposed.Meanwhile,the expansive model of expansive CFT and the initial contact pressure between the tube and the core concrete caused by the expansion of concrete core are investigated.The factors influencing the ultimate bearing capacity of expansive CFT short columns are discussed.The calculated results obtained by the proposed formula are in good agreement with the experimental ones.
2007, 37(8): 28-30.
doi: 10.13204/j.gyjz200708008
Abstract:
Displacement-based seismic design method of concrete filled circular steel tube columns has been researched.The basic procedure,the key problems such as equivalent stiffness and damping ratio,the detail design procedure of CFT columns and the main factors related were summarized.Results show that: stiffness of the second stage has little effect on hysteretic damping ratio. As the increasing of axial loading ratio,thickness of steel tube increases and displacement ductility of CFT column also increases.As the increasing of the dimension of CFT column,thickness of steel tube and yield moment decrease.
Displacement-based seismic design method of concrete filled circular steel tube columns has been researched.The basic procedure,the key problems such as equivalent stiffness and damping ratio,the detail design procedure of CFT columns and the main factors related were summarized.Results show that: stiffness of the second stage has little effect on hysteretic damping ratio. As the increasing of axial loading ratio,thickness of steel tube increases and displacement ductility of CFT column also increases.As the increasing of the dimension of CFT column,thickness of steel tube and yield moment decrease.
2007, 37(8): 31-35,50.
doi: 10.13204/j.gyjz200708009
Abstract:
Column with section of concrete-filled square tubes is a new type of special-shaped column and crisscross combined column of concrete-filled square tubes is a representative one.The simplified equation of slenderness ratio is deduced for crisscross combined column of square steel tubes which are connected by the diagonal lacing bar.The feasibility of superposition theory for crisscross combined column of concrete-filled square tubes is studied,and it is verified by the analysis with ANSYS.
Column with section of concrete-filled square tubes is a new type of special-shaped column and crisscross combined column of concrete-filled square tubes is a representative one.The simplified equation of slenderness ratio is deduced for crisscross combined column of square steel tubes which are connected by the diagonal lacing bar.The feasibility of superposition theory for crisscross combined column of concrete-filled square tubes is studied,and it is verified by the analysis with ANSYS.
2007, 37(8): 36-38,59.
doi: 10.13204/j.gyjz200708010
Abstract:
The article analyses。the actualities of the land resource in our country and the use of ground in house architecture of the cities, and elucidates the improtance of house architecture saving land in our country, and puts forward to measures and tactics of house architecture saving land form the taches of the layout, design, building and use of house architecture in the cities.
The article analyses。the actualities of the land resource in our country and the use of ground in house architecture of the cities, and elucidates the improtance of house architecture saving land in our country, and puts forward to measures and tactics of house architecture saving land form the taches of the layout, design, building and use of house architecture in the cities.
EXPERIMENT OF REINFORCED CONCRETE SIMPLY SUPPORTED BEAM WITH 500MPa RIBBED CARBON BARS UNDER BENDING
2007, 37(8): 39-42.
doi: 10.13204/j.gyjz200708011
Abstract:
Based on the experiments of five simply supported beams with 500MPa ribbed carbon bars,one with HRB335 bars and one with HRB400 bars,it was observed that the crack,deflection,bearing capacity and failure mode of the specimens.The analysis of the experimental results shows that the normal section of the simply supported beam with 500 MPa ribbed carbon bars accords with the plane section assumption;the measured deflection accords with the request but is larger than the calculated deflection;the measured crack width is wide but less than the calculated crack width.
Based on the experiments of five simply supported beams with 500MPa ribbed carbon bars,one with HRB335 bars and one with HRB400 bars,it was observed that the crack,deflection,bearing capacity and failure mode of the specimens.The analysis of the experimental results shows that the normal section of the simply supported beam with 500 MPa ribbed carbon bars accords with the plane section assumption;the measured deflection accords with the request but is larger than the calculated deflection;the measured crack width is wide but less than the calculated crack width.
2007, 37(8): 43-46.
doi: 10.13204/j.gyjz200708012
Abstract:
The mechanical properties of steel wires and concrete should be considered in the calculation and analysis of containment structure.The prestressed steel wires are simulated using orthotropic material properties membrane element.The finite element analysis of containment in service is based on dynamic prestressing losing of steel wires with time and the steps of analysis are put foward.Taking a nuclear power plant containment for example,the result of comparison between calculation data and the measuring data shows the feasibility of this way of analysis.The ultimate bearing capacity of containment structure is also analyzed.
The mechanical properties of steel wires and concrete should be considered in the calculation and analysis of containment structure.The prestressed steel wires are simulated using orthotropic material properties membrane element.The finite element analysis of containment in service is based on dynamic prestressing losing of steel wires with time and the steps of analysis are put foward.Taking a nuclear power plant containment for example,the result of comparison between calculation data and the measuring data shows the feasibility of this way of analysis.The ultimate bearing capacity of containment structure is also analyzed.
2007, 37(8): 47-50.
doi: 10.13204/j.gyjz200708013
Abstract:
When prestressed tendons were being tensioned in prestressed concrete frame structures,lateral restraints of columns brought about the loss of designed pre_added axial force.the loss induced designed pre_added axial stress not to be reached in beams,and would result in secondary shear and secondary moment in columns,and in beams too.In over_long and over_wide prestressed concrete frame structures with obvious lateral restraints,if the influence of lateral restraints of columns on the transfer of pre_compressive force in beams was not thought over rationally,not only the control of cracks could not be satisfied,but also the computation of carrying load capacity was not safe.Computational models of secondary interior force were built up for different tensioning order,and computational formulas were derived.Some methods were put forward for rational structural design.
When prestressed tendons were being tensioned in prestressed concrete frame structures,lateral restraints of columns brought about the loss of designed pre_added axial force.the loss induced designed pre_added axial stress not to be reached in beams,and would result in secondary shear and secondary moment in columns,and in beams too.In over_long and over_wide prestressed concrete frame structures with obvious lateral restraints,if the influence of lateral restraints of columns on the transfer of pre_compressive force in beams was not thought over rationally,not only the control of cracks could not be satisfied,but also the computation of carrying load capacity was not safe.Computational models of secondary interior force were built up for different tensioning order,and computational formulas were derived.Some methods were put forward for rational structural design.
2007, 37(8): 51-54.
doi: 10.13204/j.gyjz200708014
Abstract:
Based on the experimental research on 7 simple beams reinforced with HRB400 steel bars and 2 beams reinforced with HRB335 steel bars,the development of crack of the testing members is observed and crack width is written down in different loads and the testing results are discussed and analyzed.The results show that the crack with of HRB400 steel bars reinforced concrete beams is bigger than that of HRB335 steel bars reinforced concrete beams with the same bearing capacity. A formula according to the testing results of crack wideth under the state of service ability is deduced.The testing results of crack width are compared with the calculation results of crack width using the code formula and the deduced formula,the results show the calculation results of crack width using the deduced formula is safe.
Based on the experimental research on 7 simple beams reinforced with HRB400 steel bars and 2 beams reinforced with HRB335 steel bars,the development of crack of the testing members is observed and crack width is written down in different loads and the testing results are discussed and analyzed.The results show that the crack with of HRB400 steel bars reinforced concrete beams is bigger than that of HRB335 steel bars reinforced concrete beams with the same bearing capacity. A formula according to the testing results of crack wideth under the state of service ability is deduced.The testing results of crack width are compared with the calculation results of crack width using the code formula and the deduced formula,the results show the calculation results of crack width using the deduced formula is safe.
2007, 37(8): 55-59.
doi: 10.13204/j.gyjz200708015
Abstract:
The influence of different compatibility conditions between pile and soil on the dynamic response of a single pile embedded in a saturated soil and subjected to P,SV waves is investigated.According to the fictitious pile methodology,the pile soil interaction system is decomposed into a fictitious pile and an extended half space saturated soil.Based on the fundamental solutions for a circular harmonic patch load,the second kind of Fredholm integral equations for the pile are established via two kinds of compatibility conditions: vertical strain or vertical displacement as well as rotary angle or horizontal displacement.Solution of the integral equations yields the dynamic response of the pile soil system.Numerical results indicate that,except the axial force,numerical results for other variables due to the two compatibility conditions are very close.The research finding is an important criterion for choosing different compatibility conditions for simulating dynamic pile soil interaction.
The influence of different compatibility conditions between pile and soil on the dynamic response of a single pile embedded in a saturated soil and subjected to P,SV waves is investigated.According to the fictitious pile methodology,the pile soil interaction system is decomposed into a fictitious pile and an extended half space saturated soil.Based on the fundamental solutions for a circular harmonic patch load,the second kind of Fredholm integral equations for the pile are established via two kinds of compatibility conditions: vertical strain or vertical displacement as well as rotary angle or horizontal displacement.Solution of the integral equations yields the dynamic response of the pile soil system.Numerical results indicate that,except the axial force,numerical results for other variables due to the two compatibility conditions are very close.The research finding is an important criterion for choosing different compatibility conditions for simulating dynamic pile soil interaction.
2007, 37(8): 60-63.
doi: 10.13204/j.gyjz200708016
Abstract:
Based on Poulos's elastic theory method of pile under loading from the top,an analytical solution for pile when loaded from the bottom is deduced during the O-cell testing pile.According to the results of the computational program,the distribution of the shaft friction and displacement along the pile are given and the factors affecting the distribution such as the ratio of pile's length-to-diameter and the stiffness ratio of pile-to-soil are analyzed.
Based on Poulos's elastic theory method of pile under loading from the top,an analytical solution for pile when loaded from the bottom is deduced during the O-cell testing pile.According to the results of the computational program,the distribution of the shaft friction and displacement along the pile are given and the factors affecting the distribution such as the ratio of pile's length-to-diameter and the stiffness ratio of pile-to-soil are analyzed.
2007, 37(8): 64-67.
doi: 10.13204/j.gyjz200708017
Abstract:
It is introduced several kinds of prediction models of single_pile ultimate bearing capacities,and combining with the project cases,it is carried out the validating analysis of prediction precision of various models;the models' precise degrees are compared,and the deficiencies of the models are pointed out,the solutions are finally proposed.
It is introduced several kinds of prediction models of single_pile ultimate bearing capacities,and combining with the project cases,it is carried out the validating analysis of prediction precision of various models;the models' precise degrees are compared,and the deficiencies of the models are pointed out,the solutions are finally proposed.
2007, 37(8): 68-72.
doi: 10.13204/j.gyjz200708018
Abstract:
It is important to estimate the influence of layered soil in soil-structure interaction analysis.Although a great number of investigations have been carried out on this subject,there are very few practical methods that do not require complex calculations.A simple and practical method for estimating the impedance functions of a block foundation resting on layered soil is proposed.In this method,waves propagating in the soil are traced using the conception of the cone model.
It is important to estimate the influence of layered soil in soil-structure interaction analysis.Although a great number of investigations have been carried out on this subject,there are very few practical methods that do not require complex calculations.A simple and practical method for estimating the impedance functions of a block foundation resting on layered soil is proposed.In this method,waves propagating in the soil are traced using the conception of the cone model.
2007, 37(8): 73-76.
doi: 10.13204/j.gyjz200708019
Abstract:
The reinforced bar corrosion on lightweight reinforced concrete samples were simulated with accelerated constant current corrosion tests in this paper,and the constant current step method was used to measure the electric resistance of the concrete protective cover,which was used to characterize the corrosion penetration was investigated of reinforced bar diameter and the concrete protective layer thickness on corrosion penetration was investigated.
The reinforced bar corrosion on lightweight reinforced concrete samples were simulated with accelerated constant current corrosion tests in this paper,and the constant current step method was used to measure the electric resistance of the concrete protective cover,which was used to characterize the corrosion penetration was investigated of reinforced bar diameter and the concrete protective layer thickness on corrosion penetration was investigated.
2007, 37(8): 77-81.
doi: 10.13204/j.gyjz200708020
Abstract:
On the basis of the current durability design theories and methods,a new durability design method is proposed for concrete structures.And it is based on equivalent resistance time dependant reliability under atmosphere environment.To demonstrate the benefit of the method for both feasibility and applicability,a case study is carried out.The results show that both concrete strength and cover thickness have great effect on the durability.But the effect induced by the change of cover thickness can be decreased by enhancing the concrete strength.The influence of change in the steel bar diameter on the durability is negligible with the increase of the concrete grade or raising cover thickness.
On the basis of the current durability design theories and methods,a new durability design method is proposed for concrete structures.And it is based on equivalent resistance time dependant reliability under atmosphere environment.To demonstrate the benefit of the method for both feasibility and applicability,a case study is carried out.The results show that both concrete strength and cover thickness have great effect on the durability.But the effect induced by the change of cover thickness can be decreased by enhancing the concrete strength.The influence of change in the steel bar diameter on the durability is negligible with the increase of the concrete grade or raising cover thickness.
2007, 37(8): 82-85.
doi: 10.13204/j.gyjz200708021
Abstract:
Based on the analysis of the changes in the pertinent regulations of the standards concerned and the existing experimental results,the conversion relations between axial compressive strength and cubic compressive strength;between direct tensile strength and cubic compressive strength of lightweight aggregate concrete were deduced.According to the mathematical model of probability density function of random variable _c,the statistical parameters of the strength of lightweight aggregate concrete were obtained in the light of computation rules of the statistical parameter of random variable function.On the basis of the statistical parameters and the definition of characteristic value of material strength,the standard values of axial compressive strength and direct tensile strength of lightweight aggregate concrete were acquired.
Based on the analysis of the changes in the pertinent regulations of the standards concerned and the existing experimental results,the conversion relations between axial compressive strength and cubic compressive strength;between direct tensile strength and cubic compressive strength of lightweight aggregate concrete were deduced.According to the mathematical model of probability density function of random variable _c,the statistical parameters of the strength of lightweight aggregate concrete were obtained in the light of computation rules of the statistical parameter of random variable function.On the basis of the statistical parameters and the definition of characteristic value of material strength,the standard values of axial compressive strength and direct tensile strength of lightweight aggregate concrete were acquired.
2007, 37(8): 86-88,106.
doi: 10.13204/j.gyjz200708022
Abstract:
After a lot of site investigations and analyses,it is found that structural stability is the most important problems which threatened the earthen architecture site in the northwestern China.Some new materials and technologies,such as the soil anchor,the geofabric,the improved mud etc.,had been used for the emergency of reinforcing the southwestern big temple in ancient city of Gaochang.At some extent,these measures reach a goal of conservation of cultural property and protecting of the visitors.The experience may be beneficial to similar sprojects in the northwestern China.
After a lot of site investigations and analyses,it is found that structural stability is the most important problems which threatened the earthen architecture site in the northwestern China.Some new materials and technologies,such as the soil anchor,the geofabric,the improved mud etc.,had been used for the emergency of reinforcing the southwestern big temple in ancient city of Gaochang.At some extent,these measures reach a goal of conservation of cultural property and protecting of the visitors.The experience may be beneficial to similar sprojects in the northwestern China.
2007, 37(8): 89-92,85.
doi: 10.13204/j.gyjz200708023
Abstract:
Adopting the technique of space trusses and depending on the concrete continuous beams of the former workshop,the measures of pulling column by large-span bracket are used to rebuild the old workshops,in which the 6 m column space is reformed into 24 m.Combining with design and construction process,some technologies are adopted in the former workshop's structure rebuild and foundation strengthening.The successful experience is developed for rebuilding of old workshops.
Adopting the technique of space trusses and depending on the concrete continuous beams of the former workshop,the measures of pulling column by large-span bracket are used to rebuild the old workshops,in which the 6 m column space is reformed into 24 m.Combining with design and construction process,some technologies are adopted in the former workshop's structure rebuild and foundation strengthening.The successful experience is developed for rebuilding of old workshops.
2007, 37(8): 93-95,24.
doi: 10.13204/j.gyjz200708024
Abstract:
By analyzing the reason of forming juncture between the new construction and the old construction in rebuilding No.1 and No.2 teaching buildings of Xi'an University of Architecture and Technology as well as the necessity of treating the junctures by the buildings' normal use,according to the request of juncture disposal material in actual project,a effective and rapid treating technique is found.
By analyzing the reason of forming juncture between the new construction and the old construction in rebuilding No.1 and No.2 teaching buildings of Xi'an University of Architecture and Technology as well as the necessity of treating the junctures by the buildings' normal use,according to the request of juncture disposal material in actual project,a effective and rapid treating technique is found.
2007, 37(8): 96-100.
doi: 10.13204/j.gyjz200708025
Abstract:
An industrial workshop couldn't be checked and accepted by local government due to cracks by asymmetric settlement.The following factors are the main reasons of producing the workshop asymmetric settlement: the lack of precision on geological reconnaissance,the unsuitableness of pile type and collocation,the lack of bear the weight of part pile foundation,the poor quality of construction,nonstandard test.Accordingly,following countermeasures were put forward to reinforce and restrain settlement by static bolt-pressing pile to the ground with larger settlement,to treat beam crack by epoxy resin,to reinforce beam with wide crack by carbon fibre.
An industrial workshop couldn't be checked and accepted by local government due to cracks by asymmetric settlement.The following factors are the main reasons of producing the workshop asymmetric settlement: the lack of precision on geological reconnaissance,the unsuitableness of pile type and collocation,the lack of bear the weight of part pile foundation,the poor quality of construction,nonstandard test.Accordingly,following countermeasures were put forward to reinforce and restrain settlement by static bolt-pressing pile to the ground with larger settlement,to treat beam crack by epoxy resin,to reinforce beam with wide crack by carbon fibre.
2007, 37(8): 101-102,111.
doi: 10.13204/j.gyjz200708026
Abstract:
Through description of crack forms of typical reinforced concrete structures,it is analysed the reasons of producing cracks from designing,construction,materials and management.It is also suggested several detailed methods of preventing and treating them.
Through description of crack forms of typical reinforced concrete structures,it is analysed the reasons of producing cracks from designing,construction,materials and management.It is also suggested several detailed methods of preventing and treating them.
2007, 37(8): 103-106.
doi: 10.13204/j.gyjz200708027
Abstract:
It is proposed the conception of double-ball anchorage of prestressed concrete according to the structure of a single-ball anchorage.It is also compared the mechanical properties of these anchorages through tests.Based on which the measures for further improvement on the structure of double-ball anchorage are put forward.
It is proposed the conception of double-ball anchorage of prestressed concrete according to the structure of a single-ball anchorage.It is also compared the mechanical properties of these anchorages through tests.Based on which the measures for further improvement on the structure of double-ball anchorage are put forward.
2007, 37(8): 107-108.
doi: 10.13204/j.gyjz200708028
Abstract:
An industrial architectural design must follow after the modern architectural design conception.The projects design in Kunming Photo-Electronic Industrial Base embodies fully the essence of intensive industry,people-oriented,sustainable development and ecological protection,which also emphasizes rational composition to create simple and clear geometric bodies by new technology and materials, so as to indicate the spirit of the time of a modern industrial architecture.
An industrial architectural design must follow after the modern architectural design conception.The projects design in Kunming Photo-Electronic Industrial Base embodies fully the essence of intensive industry,people-oriented,sustainable development and ecological protection,which also emphasizes rational composition to create simple and clear geometric bodies by new technology and materials, so as to indicate the spirit of the time of a modern industrial architecture.
PLANNING AND DESIGN OF MOVEMENT-CONSTRUCTION OF CHONGQING CHANG'AN SPECIAL MACHINING PROCESSING ZONE
2007, 37(8): 109-111.
doi: 10.13204/j.gyjz200708029
Abstract:
The enterprises in the cities that move away from cities and enter into suburbs enjoy the preferential policies granted by the local government,making the planning and design at high starting point is a strategic decision to realize the sustainable development.
The enterprises in the cities that move away from cities and enter into suburbs enjoy the preferential policies granted by the local government,making the planning and design at high starting point is a strategic decision to realize the sustainable development.
2007, 37(8): 112-116.
doi: 10.13204/j.gyjz200708030
Abstract:
The public residence development with government investment plays a leading role in housing industry and technical development in Japan.During each phase of residence development,it is varied greatly the participating means and function of the main part of public residence construction cause in the development of residence technology.Based on mastering the introducing skill of constructive rational technology for public redidence in Japan,it is also analyzed and evaluated the idealest technology-introducing skillthe execution skill and technology-introducing effectiveness of performance bidding.
The public residence development with government investment plays a leading role in housing industry and technical development in Japan.During each phase of residence development,it is varied greatly the participating means and function of the main part of public residence construction cause in the development of residence technology.Based on mastering the introducing skill of constructive rational technology for public redidence in Japan,it is also analyzed and evaluated the idealest technology-introducing skillthe execution skill and technology-introducing effectiveness of performance bidding.
2007, 37(8): 117-119.
doi: 10.13204/j.gyjz200708031
Abstract:
The burying of electrical embedded parts in production of prestressed reinforced concrete plate(PC) house can lead not only to complication and diversification of PC plate variety,but also decrease the flexibility among similar plates,which can not meet effectively the demands on diversification of householders,and the productivity is decreased by the alteration of production.Therefore,the electric embedded parts within the PC plates should be excluded in order to raise the productivity of PC houses and meet householders' demands on diversification. It is researched on the validity of electrical design separation during the design of PC houses,through a systemic analysis of the size FP(free plan) design and design work of PC houses in Japan,which provides a basis for further study on industrialized production of congregated houses that are divorced from equipment and built-in devices.
The burying of electrical embedded parts in production of prestressed reinforced concrete plate(PC) house can lead not only to complication and diversification of PC plate variety,but also decrease the flexibility among similar plates,which can not meet effectively the demands on diversification of householders,and the productivity is decreased by the alteration of production.Therefore,the electric embedded parts within the PC plates should be excluded in order to raise the productivity of PC houses and meet householders' demands on diversification. It is researched on the validity of electrical design separation during the design of PC houses,through a systemic analysis of the size FP(free plan) design and design work of PC houses in Japan,which provides a basis for further study on industrialized production of congregated houses that are divorced from equipment and built-in devices.
