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2010 Vol. 40, No. 7
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2010, 40(7): 1-3.
doi: 10.13204/j.gyjz201007001
Abstract:
Taking the design of Wuhan Sunic Laser Industrial Park for example, the thesis discussed the application of design strategy of sunstainable development in the design of industrial architecture. It also proposed the design method to carry out the design strategy of sunstainable development from planning and architecture design.
Taking the design of Wuhan Sunic Laser Industrial Park for example, the thesis discussed the application of design strategy of sunstainable development in the design of industrial architecture. It also proposed the design method to carry out the design strategy of sunstainable development from planning and architecture design.
2010, 40(7): 4-6.
doi: 10.13204/j.gyjz201007002
Abstract:
The paper introduces the concept of pharmaceutical GMP standard as well as its influence on the planning of modern medicine factory area and its architecture design. By combining with project practice, the paper also analyses and researches the planning of the factory area and the architecture design required by the pharmaceutical GMP production standards.
The paper introduces the concept of pharmaceutical GMP standard as well as its influence on the planning of modern medicine factory area and its architecture design. By combining with project practice, the paper also analyses and researches the planning of the factory area and the architecture design required by the pharmaceutical GMP production standards.
2010, 40(7): 7-9,70.
doi: 10.13204/j.gyjz201007003
Abstract:
By way of reviewing the planning and design procedure of Hefei Meiya Photoelectric Industrial Park, it has been proposed the cunception of developing a modern industrial park with technological, park-like and humanization thoughts, and also explored the successful experience in integrating local culture and natural ecolandscape with the industrial park, as well as in creating the park environment having a high grade culture and strong landscape features.
By way of reviewing the planning and design procedure of Hefei Meiya Photoelectric Industrial Park, it has been proposed the cunception of developing a modern industrial park with technological, park-like and humanization thoughts, and also explored the successful experience in integrating local culture and natural ecolandscape with the industrial park, as well as in creating the park environment having a high grade culture and strong landscape features.
2010, 40(7): 10-13.
doi: 10.13204/j.gyjz201007004
Abstract:
It was expounded the planning ideas of an industrial park, as well as explored its development strategy and pattern, and also the implementation strategy of the planning, according to the planning of machinofacture invention park in Zunhua city.
It was expounded the planning ideas of an industrial park, as well as explored its development strategy and pattern, and also the implementation strategy of the planning, according to the planning of machinofacture invention park in Zunhua city.
2010, 40(7): 14-16.
doi: 10.13204/j.gyjz201007005
Abstract:
Engineering designs of three aircraft hangars in Shanghai Pudong International Airport, i. e. China Eastern Airlines hangar, STARCO hangar, and BSAS hangar have been summarized in this paper. Functionality and building engineering design involved in the aircraft hangar design are analyzed as well. The paper is for sharing the design experience and looking for better approach to aircraft hangar design.
Engineering designs of three aircraft hangars in Shanghai Pudong International Airport, i. e. China Eastern Airlines hangar, STARCO hangar, and BSAS hangar have been summarized in this paper. Functionality and building engineering design involved in the aircraft hangar design are analyzed as well. The paper is for sharing the design experience and looking for better approach to aircraft hangar design.
2010, 40(7): 17-18.
doi: 10.13204/j.gyjz201007006
Abstract:
This paper introduces the design characteristics and ideas of the cast steel wheel workshop. Several problems in the design of modern industrial buildings are resolved, including the planar layout, facade design, ventilation, lighting and architectural style and etc.
This paper introduces the design characteristics and ideas of the cast steel wheel workshop. Several problems in the design of modern industrial buildings are resolved, including the planar layout, facade design, ventilation, lighting and architectural style and etc.
2010, 40(7): 19-23,84.
doi: 10.13204/j.gyjz201007007
Abstract:
The progress of the processing technology, the discovery of new processing technique and rule, the use of new materials, and the appearance of the ideas for the sustainable development of the medicine manufacture lead to the development of the design of the medicine industry architecture on a scientific, refining , automatic and rational way. According to the cases of constructions in design, the flow it was expounded that charts of the design of A-type and B-type buildings for medicine manufacture in a chemical way, of C-type buildings for the manufacture of Chinese medicine, and of the buildings of bio-chemical medicine manufacture for the propose of research and testing it was also explained. And how to set the personnel flow and material flow, to design fire sub-zone, to satisfy the requirements for explosion prevention, safety evacuation, pollution prevention and the anti-noise etc.
The progress of the processing technology, the discovery of new processing technique and rule, the use of new materials, and the appearance of the ideas for the sustainable development of the medicine manufacture lead to the development of the design of the medicine industry architecture on a scientific, refining , automatic and rational way. According to the cases of constructions in design, the flow it was expounded that charts of the design of A-type and B-type buildings for medicine manufacture in a chemical way, of C-type buildings for the manufacture of Chinese medicine, and of the buildings of bio-chemical medicine manufacture for the propose of research and testing it was also explained. And how to set the personnel flow and material flow, to design fire sub-zone, to satisfy the requirements for explosion prevention, safety evacuation, pollution prevention and the anti-noise etc.
2010, 40(7): 24-27.
doi: 10.13204/j.gyjz201007008
Abstract:
Laying stress on recovering historic appearance of buildings and exhibiting their original historic state, this project appropriately utilizes the original building and gives the rational division and reorganization of indoor spaces.It is expected to make some explorations into the topic of the reuse and conservation of industrial heritages.
Laying stress on recovering historic appearance of buildings and exhibiting their original historic state, this project appropriately utilizes the original building and gives the rational division and reorganization of indoor spaces.It is expected to make some explorations into the topic of the reuse and conservation of industrial heritages.
2010, 40(7): 28-30.
doi: 10.13204/j.gyjz201007009
Abstract:
Industrial buildingsoutside spaces are the integral part of an urban space. It has been done that various researches on industrial buildingsoutside spaces by architects, which have been guided by people-oriented concept.It had been got wide acceptance in the society to design outer space for industrial buildings with plants. Therefore, full green design will be the development direction of the design of industrial buildingsoutside spaces.
Industrial buildingsoutside spaces are the integral part of an urban space. It has been done that various researches on industrial buildingsoutside spaces by architects, which have been guided by people-oriented concept.It had been got wide acceptance in the society to design outer space for industrial buildings with plants. Therefore, full green design will be the development direction of the design of industrial buildingsoutside spaces.
2010, 40(7): 31-35.
doi: 10.13204/j.gyjz201007010
Abstract:
Because of the eccentricity and irregularity of the frame-bent structure for an industrial workshop, based on the prototype of the principal workshop of a thermal power plant, the spatial computational model of integral structure was established, modal analysis and elastoplastic time history analysis under two-directional horizontal earthquake were made. Combined with the former pseudo-dynamic experiment and quasi-static experiment, the dynamic properties and the spatial deformation performance were studied on emphasis. The result shows that the stiffness of longitudinal direction and the transverse direction is abrupt, which makes the torsional effect evidently, and the weak parts are more, which need attention in its design.
Because of the eccentricity and irregularity of the frame-bent structure for an industrial workshop, based on the prototype of the principal workshop of a thermal power plant, the spatial computational model of integral structure was established, modal analysis and elastoplastic time history analysis under two-directional horizontal earthquake were made. Combined with the former pseudo-dynamic experiment and quasi-static experiment, the dynamic properties and the spatial deformation performance were studied on emphasis. The result shows that the stiffness of longitudinal direction and the transverse direction is abrupt, which makes the torsional effect evidently, and the weak parts are more, which need attention in its design.
2010, 40(7): 36-41.
doi: 10.13204/j.gyjz201007011
Abstract:
A 8-story reinforced concrete frame structure is designed by using the force-based seismic design method.Then, the performance of frame structure is divided into three levels: serviceability, life-safety, and collapse protection. The three levels are quantified with story drift ratios, base shear and top displacement of the structure is calculated for three performance levels. For serviceability and collapse protection, the members is proportioned and the appropriate reinforcement selected, and details of seismic design is taken to ensure the deformability of the structure. The calculation results are verified by non-linear static analysis method. The results of two design methods are compared. Analysis result shows the members section reinforcements based on serviceability performance level are close to those by the force-based seismic design.
A 8-story reinforced concrete frame structure is designed by using the force-based seismic design method.Then, the performance of frame structure is divided into three levels: serviceability, life-safety, and collapse protection. The three levels are quantified with story drift ratios, base shear and top displacement of the structure is calculated for three performance levels. For serviceability and collapse protection, the members is proportioned and the appropriate reinforcement selected, and details of seismic design is taken to ensure the deformability of the structure. The calculation results are verified by non-linear static analysis method. The results of two design methods are compared. Analysis result shows the members section reinforcements based on serviceability performance level are close to those by the force-based seismic design.
2010, 40(7): 42-46.
doi: 10.13204/j.gyjz201007012
Abstract:
A 19-story shear-wall structure in Suqian, Jiangsu Province is analyzed abiding by static-dynamic analytical method, which is combined with nonlinear static analysis of 3d model and nonlinear time history analysis based on flexure shear storey model. Firstly, nonlinear static analysis method is applied to 3d model of the structure and the storey restoring force curves are obtained. Secondly, on the basis of the flexure shear storey model, the shearwall structure is calculated by the nonlinear time history method. Finally, the vibration-absorptive analysis of the structure with nonlinear viscous fluid damper under earthquake is studied. The results show that static-dynamic analytical method based on flexure shear storey model can be applied to evaluate the earthquake-resistant performance of the structure and provide a reference for engineering design and similar projects.
A 19-story shear-wall structure in Suqian, Jiangsu Province is analyzed abiding by static-dynamic analytical method, which is combined with nonlinear static analysis of 3d model and nonlinear time history analysis based on flexure shear storey model. Firstly, nonlinear static analysis method is applied to 3d model of the structure and the storey restoring force curves are obtained. Secondly, on the basis of the flexure shear storey model, the shearwall structure is calculated by the nonlinear time history method. Finally, the vibration-absorptive analysis of the structure with nonlinear viscous fluid damper under earthquake is studied. The results show that static-dynamic analytical method based on flexure shear storey model can be applied to evaluate the earthquake-resistant performance of the structure and provide a reference for engineering design and similar projects.
2010, 40(7): 47-51.
doi: 10.13204/j.gyjz201007013
Abstract:
Because the application of UHV transmission line is still in exploration stage worldwide, there are no national codes and professional technical regulations of design for such structures. Based reliability theory, referencing design method of technical regulation now in use, the factors which influencing the reliability of the structure were investigated. The reliability of the structure designed according to current technical regulations is assessed by JC method. Depending on the design files of an UHV transmission line in practice, the influences of the importance factor of the structure and design wind load on the reliability of poles and tower structures were researched. There are some results proposed such as the reliability of the structure in different wind load would not be the same by current technical regulations, etc. The analysis results can be benifit for code of UHV transmission line establishment.
Because the application of UHV transmission line is still in exploration stage worldwide, there are no national codes and professional technical regulations of design for such structures. Based reliability theory, referencing design method of technical regulation now in use, the factors which influencing the reliability of the structure were investigated. The reliability of the structure designed according to current technical regulations is assessed by JC method. Depending on the design files of an UHV transmission line in practice, the influences of the importance factor of the structure and design wind load on the reliability of poles and tower structures were researched. There are some results proposed such as the reliability of the structure in different wind load would not be the same by current technical regulations, etc. The analysis results can be benifit for code of UHV transmission line establishment.
2010, 40(7): 52-55,41.
doi: 10.13204/j.gyjz201007014
Abstract:
The ground was assumed to be elastic. The differential equation was built and solved by finite difference method in consideration of plastic slip between pile and soil. The numerical example agrees well with the field measurement. Continuity of the soil around the pile can be considered into the method. By the method, the settlement of the ground around the pile can be calculated. The method was compared with load transfer method and shear displacement method. It is shown that the method isnt simple superposition of load transfer method and shear displacement method. Degradation of the method is consistent with load transfer method and shear displacement method respectively.
The ground was assumed to be elastic. The differential equation was built and solved by finite difference method in consideration of plastic slip between pile and soil. The numerical example agrees well with the field measurement. Continuity of the soil around the pile can be considered into the method. By the method, the settlement of the ground around the pile can be calculated. The method was compared with load transfer method and shear displacement method. It is shown that the method isnt simple superposition of load transfer method and shear displacement method. Degradation of the method is consistent with load transfer method and shear displacement method respectively.
2010, 40(7): 56-58,90.
doi: 10.13204/j.gyjz201007015
Abstract:
The K0 loading-unloading tests for sand, saturated silt and silty clay were conducted, using the JCY consolidation apparatus, then the v-h relationships during the tests were described by K0 loading-unloading model.The parameters of K0 loading-unloading model were discussed. Several results were concluded. The v-h relationship is linear during loading, and it is unlinear during unloading. When the vertical stress v equals to zero during unloading, the residual horizontal stress is affected by the viscosity of the soil. The v-h relationship during K0 loading-unloading can be calculated by K0 loading-unloading model. The parameters K0(NC) and are affected by the friction angle .
The K0 loading-unloading tests for sand, saturated silt and silty clay were conducted, using the JCY consolidation apparatus, then the v-h relationships during the tests were described by K0 loading-unloading model.The parameters of K0 loading-unloading model were discussed. Several results were concluded. The v-h relationship is linear during loading, and it is unlinear during unloading. When the vertical stress v equals to zero during unloading, the residual horizontal stress is affected by the viscosity of the soil. The v-h relationship during K0 loading-unloading can be calculated by K0 loading-unloading model. The parameters K0(NC) and are affected by the friction angle .
2010, 40(7): 59-61,122.
doi: 10.13204/j.gyjz201007016
Abstract:
Based on joint load test of lining segment, the change regularity of the different factors influencing the bending stiffness of a longitudinal joint was studied, and then the calculation formula for the bending stiffness of longitudinal joint was deduced. The results indicate that the different factors have great effect on the bending stiffness of longitudinal joint when the axial force is relatively small, and they have limited effect on the bending stiffness of longitudinal joint when the axial force is up to a certain level relatively great. The joints structure has a significant influence on the bending stiffness of longitudinal joint.
Based on joint load test of lining segment, the change regularity of the different factors influencing the bending stiffness of a longitudinal joint was studied, and then the calculation formula for the bending stiffness of longitudinal joint was deduced. The results indicate that the different factors have great effect on the bending stiffness of longitudinal joint when the axial force is relatively small, and they have limited effect on the bending stiffness of longitudinal joint when the axial force is up to a certain level relatively great. The joints structure has a significant influence on the bending stiffness of longitudinal joint.
2010, 40(7): 62-66.
doi: 10.13204/j.gyjz201007017
Abstract:
The vertical and lateral load test on rectangular diaphragm wall was introduced. By the constrastive analysis of axial force transfer, the exerting degree of shaft resistance and end bearing capacity between the part of the wall under the load case and the whole wall after grouting, the results indicates the effects of grouting on the bearing capacity and load transfer of the wall before and after grouting. By the lateral traditional static load test, the lateral critical load, lateral ultimate bearing capacity, the m-value of the lateral subgrade coefficient, internal force and the lateral displacement of the wall were calculated through analyzing the test data.
The vertical and lateral load test on rectangular diaphragm wall was introduced. By the constrastive analysis of axial force transfer, the exerting degree of shaft resistance and end bearing capacity between the part of the wall under the load case and the whole wall after grouting, the results indicates the effects of grouting on the bearing capacity and load transfer of the wall before and after grouting. By the lateral traditional static load test, the lateral critical load, lateral ultimate bearing capacity, the m-value of the lateral subgrade coefficient, internal force and the lateral displacement of the wall were calculated through analyzing the test data.
2010, 40(7): 67-70.
doi: 10.13204/j.gyjz201007018
Abstract:
The axial compression characteristics are studied in the experiments of five CFRP tendons reinforced concrete columns. The influences of the distance between CFRP hoops and the contributions of CFRP tendons on the bearing capacity of the columns were researched in the experiments. The test results indicate that the concrete will be crushed in first under axial compression, and the CFRP tendons or CFRP hoops are likely to be destroyed if the compression force continues to increase. CFRP tendons are helpful to bearing capacity, and CFRP hoops are helpful to bearing capacity when the distance between CFRP hoops is small. But the effect of CFRP hoops on bearing capacity can be ignored if the distance between CFRP hoops exceeds a limit.
The axial compression characteristics are studied in the experiments of five CFRP tendons reinforced concrete columns. The influences of the distance between CFRP hoops and the contributions of CFRP tendons on the bearing capacity of the columns were researched in the experiments. The test results indicate that the concrete will be crushed in first under axial compression, and the CFRP tendons or CFRP hoops are likely to be destroyed if the compression force continues to increase. CFRP tendons are helpful to bearing capacity, and CFRP hoops are helpful to bearing capacity when the distance between CFRP hoops is small. But the effect of CFRP hoops on bearing capacity can be ignored if the distance between CFRP hoops exceeds a limit.
2010, 40(7): 71-74,126.
doi: 10.13204/j.gyjz201007019
Abstract:
Direct tensile behaviors of HPC with 3 different mix proportions at the age of 3 d were investigated with self-designed testing rig in this paper. The results of the present study can be drawn as follows: a) testing rig developed in this study effectively evaluated direct tensile behaviors of hardening HPC; b) ultimate tensile strain of HPC was very high in the period of hardening, which rapidly decreased with age and minimum value was reached later (about 12 hours) ; c) tensile strength and tensile modulus of elasticity of HPC rapidly developed within 1 d.
Direct tensile behaviors of HPC with 3 different mix proportions at the age of 3 d were investigated with self-designed testing rig in this paper. The results of the present study can be drawn as follows: a) testing rig developed in this study effectively evaluated direct tensile behaviors of hardening HPC; b) ultimate tensile strain of HPC was very high in the period of hardening, which rapidly decreased with age and minimum value was reached later (about 12 hours) ; c) tensile strength and tensile modulus of elasticity of HPC rapidly developed within 1 d.
2010, 40(7): 75-79.
doi: 10.13204/j.gyjz201007020
Abstract:
Chloride ion is the main reason that impacts the durability of reinforced concrete structures in marine environment, while the surface chloride concentration of concrete structures is one of the most important factor influencing the transport process of chloride into structural concrete. Because of the different local environments for concrete structures at different heights, the surface chloride concentration varys with the heights. Based on the inspected data of surface chloride concentration from a concrete port which locates at eastern coastal area of Zhejiang Province, a single peak Gaussian distribution is proposed to describe the surface chloride concentration along the height of structure. A model of surface chloride using BP neural network is established to predict the distribution of the surface chloride concentration along the height. To find out the most serious chloride aggression region of reinforced concrete structures, probability based statistical analysis of inspection data from concrete ports of eastern coastal area of Zhejiang Province and Japan is carried out. The most serious chloride aggression height is from 0. 4 to 1. 6 m above the sea level, from 0. 285 to 0. 478 of water infiltration time ratio, where the anti-aggression capacity of chloride should be strengthened. Finally, according to the normalized inspected data, empirical equations are proposed to describe the influence of height and water infiltration time on surface chloride ion concentration based on a Gaussian Function.
Chloride ion is the main reason that impacts the durability of reinforced concrete structures in marine environment, while the surface chloride concentration of concrete structures is one of the most important factor influencing the transport process of chloride into structural concrete. Because of the different local environments for concrete structures at different heights, the surface chloride concentration varys with the heights. Based on the inspected data of surface chloride concentration from a concrete port which locates at eastern coastal area of Zhejiang Province, a single peak Gaussian distribution is proposed to describe the surface chloride concentration along the height of structure. A model of surface chloride using BP neural network is established to predict the distribution of the surface chloride concentration along the height. To find out the most serious chloride aggression region of reinforced concrete structures, probability based statistical analysis of inspection data from concrete ports of eastern coastal area of Zhejiang Province and Japan is carried out. The most serious chloride aggression height is from 0. 4 to 1. 6 m above the sea level, from 0. 285 to 0. 478 of water infiltration time ratio, where the anti-aggression capacity of chloride should be strengthened. Finally, according to the normalized inspected data, empirical equations are proposed to describe the influence of height and water infiltration time on surface chloride ion concentration based on a Gaussian Function.
2010, 40(7): 80-84.
doi: 10.13204/j.gyjz201007021
Abstract:
In this paper the technology of steel fiber shotcrete suitable to the support of large cavity is proposed by laboratory and field experiments. The selection of materials for steel fiber shotcrete and design of its mix proportion are discussed and the selection of wet-spray equipments and technical characteristic of construction of wet-spray steel fiber shotcrete are summarized. The results of experiments show that different types of wet-spray equipments using in construction need the steel fiber shopcrete with different mix proportion and corresponding admixture. The steel fiber shotcrete under the optimized design can meet the requirements of compressive strength, tensile strength, flexural strength, bending temper index, temper coefficient, bond strength with surrounding rock and other technical indexes.
In this paper the technology of steel fiber shotcrete suitable to the support of large cavity is proposed by laboratory and field experiments. The selection of materials for steel fiber shotcrete and design of its mix proportion are discussed and the selection of wet-spray equipments and technical characteristic of construction of wet-spray steel fiber shotcrete are summarized. The results of experiments show that different types of wet-spray equipments using in construction need the steel fiber shopcrete with different mix proportion and corresponding admixture. The steel fiber shotcrete under the optimized design can meet the requirements of compressive strength, tensile strength, flexural strength, bending temper index, temper coefficient, bond strength with surrounding rock and other technical indexes.
2010, 40(7): 85-90.
doi: 10.13204/j.gyjz201007022
Abstract:
To study the seismic behavior of L-shaped concrete-filled steel tubular column, based on experimental study and stress strain relationship of the core concrete of L-shaped concrete-filled steel tubular column subjected to low cyclic loading, nonlinear finite element method analysis of L-shaped concrete-filled steel tubular column is carried out by Opensees software. The lateral load (P) versus lateral displacement () envelope curves and its influencing factors are analyzed. The results show that the calculation results totally correspond with experimental results. The influence of the width-thickness ratio D/t on the envelope curve is similar to that of the length-width ratio D/B, which has little effect on the shape of the envelope curve but will influence the lateral loading capacity. The axial compression ratio is the main factor affecting the envelope curve of the member. In the elastic stage, the influence of the axial compression ratio on the stiffness of the member is small while it is significant in elastic-plastic stage. As the increase of the axial compression ratio, the stiffness of the member and the horizontal loading capacity will decrease.Meanwhile, the curve becomes descendent and the descent amplitude will increase as the increase of the axial compression ratio, which indicates that the ductility of the member becomes worse.
To study the seismic behavior of L-shaped concrete-filled steel tubular column, based on experimental study and stress strain relationship of the core concrete of L-shaped concrete-filled steel tubular column subjected to low cyclic loading, nonlinear finite element method analysis of L-shaped concrete-filled steel tubular column is carried out by Opensees software. The lateral load (P) versus lateral displacement () envelope curves and its influencing factors are analyzed. The results show that the calculation results totally correspond with experimental results. The influence of the width-thickness ratio D/t on the envelope curve is similar to that of the length-width ratio D/B, which has little effect on the shape of the envelope curve but will influence the lateral loading capacity. The axial compression ratio is the main factor affecting the envelope curve of the member. In the elastic stage, the influence of the axial compression ratio on the stiffness of the member is small while it is significant in elastic-plastic stage. As the increase of the axial compression ratio, the stiffness of the member and the horizontal loading capacity will decrease.Meanwhile, the curve becomes descendent and the descent amplitude will increase as the increase of the axial compression ratio, which indicates that the ductility of the member becomes worse.
2010, 40(7): 91-94,104.
doi: 10.13204/j.gyjz201007023
Abstract:
It has been studied and simulated that 6 pure bending of concrete-filled steel tubular members with the ratio of width and thickness being greater than 55. It has also been studied that the forced behavior and influencing factors of the steel tube concrete beams. The study results show that the concrete-filled steel tube bending members have high flexural capacity and good ductility. Even the cross-section deflection reached L/20, the load of the specimen on the outside can still increase. The effect of ratio of width and thickness is more significantly than that of the ratio of height and width on the flexural capacity of the member. It has been adopted SAP 2000 to simulate the forced full process of the steel tube concrete beams, whose result agreed well with the test result.
It has been studied and simulated that 6 pure bending of concrete-filled steel tubular members with the ratio of width and thickness being greater than 55. It has also been studied that the forced behavior and influencing factors of the steel tube concrete beams. The study results show that the concrete-filled steel tube bending members have high flexural capacity and good ductility. Even the cross-section deflection reached L/20, the load of the specimen on the outside can still increase. The effect of ratio of width and thickness is more significantly than that of the ratio of height and width on the flexural capacity of the member. It has been adopted SAP 2000 to simulate the forced full process of the steel tube concrete beams, whose result agreed well with the test result.
2010, 40(7): 95-99.
doi: 10.13204/j.gyjz201007024
Abstract:
A new method is proposed for calculating ultimate capacity of axially loaded rectangular CFT stub columns. Compared with the previous methods, the method considers the difference between concrete confinement effect provided by broad faces and that provided by narrow faces of the steel tube. The failure criterion for concrete based on true triaxial compression test is used to predict the ultimate strength of concrete core. Also, longitudinal steel strength of broad faces and that of narrow faces are respectively calculated due to considering the difference between longitudinal steel strength of broad faces and that of narrow faces. The new method is used to calculate ultimate capacity of 56 axially loaded rectangular CFT stub column specimens. The calculated results are compared with experimental results, which show a good agreement.
A new method is proposed for calculating ultimate capacity of axially loaded rectangular CFT stub columns. Compared with the previous methods, the method considers the difference between concrete confinement effect provided by broad faces and that provided by narrow faces of the steel tube. The failure criterion for concrete based on true triaxial compression test is used to predict the ultimate strength of concrete core. Also, longitudinal steel strength of broad faces and that of narrow faces are respectively calculated due to considering the difference between longitudinal steel strength of broad faces and that of narrow faces. The new method is used to calculate ultimate capacity of 56 axially loaded rectangular CFT stub column specimens. The calculated results are compared with experimental results, which show a good agreement.
2010, 40(7): 100-104.
doi: 10.13204/j.gyjz201007025
Abstract:
A new type of concrete-filled steel tube (CFST) column-RC beam joint was presented in this paper. In the CFST column-RC beam connecting zone, the out steel tube of CFST column locally opened with rectangular hole and stiffened, the longitudinal reinforcing bars in RC beam stretched into the joint. The concrete was monolithically cast in the region of the beam, the column and the joint. The construction of joint was simplified and the joint stiffness was strengthened. The failure process and the failure mode of the specimens studied by experiments. The studies showed that the joint did not fail when the specimen was in limit state, while the beam and the column were damaged. The feasibility of the joint in the static load was proved. The joint meets the seismic design principles strong column, weak beam, stronger joint
A new type of concrete-filled steel tube (CFST) column-RC beam joint was presented in this paper. In the CFST column-RC beam connecting zone, the out steel tube of CFST column locally opened with rectangular hole and stiffened, the longitudinal reinforcing bars in RC beam stretched into the joint. The concrete was monolithically cast in the region of the beam, the column and the joint. The construction of joint was simplified and the joint stiffness was strengthened. The failure process and the failure mode of the specimens studied by experiments. The studies showed that the joint did not fail when the specimen was in limit state, while the beam and the column were damaged. The feasibility of the joint in the static load was proved. The joint meets the seismic design principles strong column, weak beam, stronger joint
2010, 40(7): 105-109.
doi: 10.13204/j.gyjz201007026
Abstract:
This paper discusses some problems of Code for Seismic Design of Buildings and Technical Specification for Concrete Structures of Tall Buildingsthat are often encountered by designers, those problems are not specified clearly in the codes. The relative conclusions and suggestions may be referred by designers.
This paper discusses some problems of Code for Seismic Design of Buildings and Technical Specification for Concrete Structures of Tall Buildingsthat are often encountered by designers, those problems are not specified clearly in the codes. The relative conclusions and suggestions may be referred by designers.
2010, 40(7): 110-113.
doi: 10.13204/j.gyjz201007027
Abstract:
In this paper, the structural design of enlarged-storey and extension for an existing RC frame structure is introduced. It is analyzed and discussed that determining of structural scheme, controlling of difference in subsidence between new pile foundation and existing pile foundation, calculating and strengthening of existing pile cap, detailing of joint conneted steel structure with existing RC structure and strengthening of existing RC structure.
In this paper, the structural design of enlarged-storey and extension for an existing RC frame structure is introduced. It is analyzed and discussed that determining of structural scheme, controlling of difference in subsidence between new pile foundation and existing pile foundation, calculating and strengthening of existing pile cap, detailing of joint conneted steel structure with existing RC structure and strengthening of existing RC structure.
2010, 40(7): 114-117,131.
doi: 10.13204/j.gyjz201007028
Abstract:
Due to the fact that because of the maximum design wind speed is low and without considering the height variation factor of wind pressure, the tower in operation is usually damaged and collapsed by the strong wind. It is a serious threat to the safe operation of the transmission tower. It is a pressing question to resist the strong wind by reinforcing and strengthening the tower. According to the engineering experience, the reinforcement and strengthening method is proposed, which can make full use of the bolt holes of leg members. In order to verify the feasibility of reinforcement and strengthening method, five model towers are tested in laboratory. The comparative analysis of bearing capacity of these towers shows that this method has a remarkable improvement of bearing capacity. Through the analysis of the test result, the calculation method of bearing capacity is proposed.
Due to the fact that because of the maximum design wind speed is low and without considering the height variation factor of wind pressure, the tower in operation is usually damaged and collapsed by the strong wind. It is a serious threat to the safe operation of the transmission tower. It is a pressing question to resist the strong wind by reinforcing and strengthening the tower. According to the engineering experience, the reinforcement and strengthening method is proposed, which can make full use of the bolt holes of leg members. In order to verify the feasibility of reinforcement and strengthening method, five model towers are tested in laboratory. The comparative analysis of bearing capacity of these towers shows that this method has a remarkable improvement of bearing capacity. Through the analysis of the test result, the calculation method of bearing capacity is proposed.
2010, 40(7): 118-122.
doi: 10.13204/j.gyjz201007029
Abstract:
The settlement of the foundation on the soft ground would affect the normal operation and safety of the substation. The existing reinforcing methods and machinery can't work in the high-voltage fields. For a 220kV substation on the sea sediment foundation in a city along the coast, Jiangsu Province, China, the settlement should be controlled at a 2.2m high security restrictions with the requirement of the original operation of the substation. A small-scale pile-driver was developed, and reinforcement tests were carried out. The results show that the small-scale pile driver can work well for running substation, which is a breakthrough of the reinforcement of substation foundation at the restricted space. The micro-steel pipe pile can effectively prevent the settlement of independent foundation.The technology of prestressing on the pile top, soldering after withstand, can improve reinforcement effect.
The settlement of the foundation on the soft ground would affect the normal operation and safety of the substation. The existing reinforcing methods and machinery can't work in the high-voltage fields. For a 220kV substation on the sea sediment foundation in a city along the coast, Jiangsu Province, China, the settlement should be controlled at a 2.2m high security restrictions with the requirement of the original operation of the substation. A small-scale pile-driver was developed, and reinforcement tests were carried out. The results show that the small-scale pile driver can work well for running substation, which is a breakthrough of the reinforcement of substation foundation at the restricted space. The micro-steel pipe pile can effectively prevent the settlement of independent foundation.The technology of prestressing on the pile top, soldering after withstand, can improve reinforcement effect.
2010, 40(7): 123-126.
doi: 10.13204/j.gyjz201007030
Abstract:
Due to the construction de-watering in the vicinity river , several cracks appearced in an brick and reinforced concrete building and the first floor balcony had unequal settlement , these are mainly previous cracks, the maximum width of the cracks is up to 50 mm, there are no cracks on the main wall. After appraisal, the main reason is that there is a pile foundation under the main structure of the building, but under the first floor balcony there is only the strip footing . The soil layer under the building is underconsolidated soil deposit, during the consolidation, large unequal settlement occurred in the building, the construction de-watering promoted the consolidation, which made the cracks be wider. So using these treatment measures, such as constructing chemical churning piles as the barrier-wall, pasting gypsum on the cracks and so on, at the same time intensive observation of the stability of the cracks and change in underground water level was done. After reinforcement it was observed the settlement again and found on obvious change.
Due to the construction de-watering in the vicinity river , several cracks appearced in an brick and reinforced concrete building and the first floor balcony had unequal settlement , these are mainly previous cracks, the maximum width of the cracks is up to 50 mm, there are no cracks on the main wall. After appraisal, the main reason is that there is a pile foundation under the main structure of the building, but under the first floor balcony there is only the strip footing . The soil layer under the building is underconsolidated soil deposit, during the consolidation, large unequal settlement occurred in the building, the construction de-watering promoted the consolidation, which made the cracks be wider. So using these treatment measures, such as constructing chemical churning piles as the barrier-wall, pasting gypsum on the cracks and so on, at the same time intensive observation of the stability of the cracks and change in underground water level was done. After reinforcement it was observed the settlement again and found on obvious change.
2010, 40(7): 127-131.
doi: 10.13204/j.gyjz201007031
Abstract:
There are some misconceptions in understanding of vernacular architetcures. Attention is paid to the form but the influences of local climate and natural environment are ignored; it is not understood how to express truly in the choice of materials and the method of using them. A splendid style is pursued but little care is given to the demands of ordinary people. Some enlightenments can be obtained from Baker's works.
There are some misconceptions in understanding of vernacular architetcures. Attention is paid to the form but the influences of local climate and natural environment are ignored; it is not understood how to express truly in the choice of materials and the method of using them. A splendid style is pursued but little care is given to the demands of ordinary people. Some enlightenments can be obtained from Baker's works.
