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2007 Vol. 37, No. 7
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2007, 37(7): 1-3.
doi: 10.13204/j.gyjz200707001
Abstract:
According to the survery and study of urban architectures in the Northern Europe,it is recognized that their design conception and principles are lacked in China's architecture design.At the tide of modernization,China should become a major design country whose situation should be changed from made in China to designed in China and from partial excessive design to Comprehensive design.
According to the survery and study of urban architectures in the Northern Europe,it is recognized that their design conception and principles are lacked in China's architecture design.At the tide of modernization,China should become a major design country whose situation should be changed from made in China to designed in China and from partial excessive design to Comprehensive design.
2007, 37(7): 4-6.
doi: 10.13204/j.gyjz200707002
Abstract:
According to the analysis of the projects of Xi'an Fashite Automobile Transmission Co.,Ltd.from the aspects of design concept,overall layout,environmental and architectural design,it is pointed out that the design of modern industrial architectures should sustain the design principle of people-oriented,besides meet the needs of production flowchart;only by integrating the features and contents of industrial architectures into enterprise culture,obtaining integral coordination between an industrial architecture and a social environment,can a new industrial architecture with time features and high level of art be created.
According to the analysis of the projects of Xi'an Fashite Automobile Transmission Co.,Ltd.from the aspects of design concept,overall layout,environmental and architectural design,it is pointed out that the design of modern industrial architectures should sustain the design principle of people-oriented,besides meet the needs of production flowchart;only by integrating the features and contents of industrial architectures into enterprise culture,obtaining integral coordination between an industrial architecture and a social environment,can a new industrial architecture with time features and high level of art be created.
2007, 37(7): 7-8.
doi: 10.13204/j.gyjz200707003
Abstract:
The rehabilitation of old buildings has been a hot topic in recent China for a while.Focusing on the study of rehabilitation project of the former Shaanxi Steel works,the essay considers the value and meaning of the rehabilitation of the main body and change in property from the cultural and architectural aspects.
The rehabilitation of old buildings has been a hot topic in recent China for a while.Focusing on the study of rehabilitation project of the former Shaanxi Steel works,the essay considers the value and meaning of the rehabilitation of the main body and change in property from the cultural and architectural aspects.
2007, 37(7): 9-12.
doi: 10.13204/j.gyjz200707004
Abstract:
In the retrospect to development of passenger of Xi'an Xianyang international airport,there are the gigantic pressures in our country airport.With the rapid development of our economy,it is pointed out that a scientific and perspective development view should be sustained in the airport plan.
In the retrospect to development of passenger of Xi'an Xianyang international airport,there are the gigantic pressures in our country airport.With the rapid development of our economy,it is pointed out that a scientific and perspective development view should be sustained in the airport plan.
2007, 37(7): 13-15.
doi: 10.13204/j.gyjz200707005
Abstract:
Clean operating department is a very important part of modern hospital.By analyzing the functions of a clean operating department,it is explored that its characteristics,design principles,space formation,routes organization,space patterns and the relationship with other departments,so as to create an efficient and clean operating environment.
Clean operating department is a very important part of modern hospital.By analyzing the functions of a clean operating department,it is explored that its characteristics,design principles,space formation,routes organization,space patterns and the relationship with other departments,so as to create an efficient and clean operating environment.
2007, 37(7): 16-18.
doi: 10.13204/j.gyjz200707006
Abstract:
The perception on the cityscape identity comes from the revelation and reading to the urban spaces' pattern,which presents the deposit of the life and the culture formed during each historical period.This revelation and perception always rely on the expansion of linear public spaces,it is not just the space form like street and road,it could be a circulation or a direction with all the elements system that perceived by the common people.Through the analysis of landscape from the Big Goose Pagoda to the Bell Tower in Xi'an,it is explored the way for a cityscape design from the linear space.
The perception on the cityscape identity comes from the revelation and reading to the urban spaces' pattern,which presents the deposit of the life and the culture formed during each historical period.This revelation and perception always rely on the expansion of linear public spaces,it is not just the space form like street and road,it could be a circulation or a direction with all the elements system that perceived by the common people.Through the analysis of landscape from the Big Goose Pagoda to the Bell Tower in Xi'an,it is explored the way for a cityscape design from the linear space.
2007, 37(7): 19-21.
doi: 10.13204/j.gyjz200707007
Abstract:
It is introduced the experience in changing an existing plant area into a new community based on protecting the inheritance of the original plant area,respecting its natural conditions and industrial resources,as well as combining with new functions.
It is introduced the experience in changing an existing plant area into a new community based on protecting the inheritance of the original plant area,respecting its natural conditions and industrial resources,as well as combining with new functions.
2007, 37(7): 22-24.
doi: 10.13204/j.gyjz200707008
Abstract:
Jia Pingwa Literature Art Gallery grew out of an old and simple printing workshop which was built in 1970's.According to historical context,the design of the gallery focuses on satisfying the new functions of display exchange and endowing the building with spirit and poetry while basically maintaining the structure space of the original.
Jia Pingwa Literature Art Gallery grew out of an old and simple printing workshop which was built in 1970's.According to historical context,the design of the gallery focuses on satisfying the new functions of display exchange and endowing the building with spirit and poetry while basically maintaining the structure space of the original.
2007, 37(7): 25-28.
doi: 10.13204/j.gyjz200707009
Abstract:
Along with the development of the longitudinal steel stress in two-stage flexural RC composite members,location of neutral axis is influenced by twostage loading.Full-course analysis method for the stress in these members is given based on calculation of depth of compression zone and simplification of feature coefficient of stress diagrams.A composite beam is computed by the proposed method,and some verification from ANSYS is listed in the end.The results suggest that the method is feasible.The maximum fractional error of the computed value of longitudinal steel stress during full-course analysis between FEM and method in this paper is kept within 5.5%.
Along with the development of the longitudinal steel stress in two-stage flexural RC composite members,location of neutral axis is influenced by twostage loading.Full-course analysis method for the stress in these members is given based on calculation of depth of compression zone and simplification of feature coefficient of stress diagrams.A composite beam is computed by the proposed method,and some verification from ANSYS is listed in the end.The results suggest that the method is feasible.The maximum fractional error of the computed value of longitudinal steel stress during full-course analysis between FEM and method in this paper is kept within 5.5%.
2007, 37(7): 29-32.
doi: 10.13204/j.gyjz200707010
Abstract:
Based on test of two prototype RC frames with dampers and braces under low cyclic loading,reloading experimental study is proceeded after strengthening.The reloaded strengthened frames are respectively reset to their initial positions,and test under the same load history was made to study the residual bearing capacity.Damaging process and forms of the members,as well as hysteresis behavior of the frames,are obtained in both the cases.The results show that after strengthening the horizontal bearing capacity of the frames is lower but the ductility of the whole frame is raised compared to that of the prototypes;The dampers improve the ductility of the frame to a certain extent and the lock-up braces enhance the post loading capacity of the frame,and this carries out the thinking of multi-lines resisting earthquake.Results of this paper may supply references to structure designers.The residential bearing capacity of the reset frames is decreased to a certain extent,but it still maintains some seismic performance.
Based on test of two prototype RC frames with dampers and braces under low cyclic loading,reloading experimental study is proceeded after strengthening.The reloaded strengthened frames are respectively reset to their initial positions,and test under the same load history was made to study the residual bearing capacity.Damaging process and forms of the members,as well as hysteresis behavior of the frames,are obtained in both the cases.The results show that after strengthening the horizontal bearing capacity of the frames is lower but the ductility of the whole frame is raised compared to that of the prototypes;The dampers improve the ductility of the frame to a certain extent and the lock-up braces enhance the post loading capacity of the frame,and this carries out the thinking of multi-lines resisting earthquake.Results of this paper may supply references to structure designers.The residential bearing capacity of the reset frames is decreased to a certain extent,but it still maintains some seismic performance.
2007, 37(7): 33-35.
doi: 10.13204/j.gyjz200707011
Abstract:
It is compared and analyzed that the failure mechanism,bearing capacity,deformation and rupture forms of edge joints through loading test with and without reinforced concrete flat beams,whose width height ratio is 3.It is also made a breakthrough at the requirements for section width limit of flat beams in Code for Seismic Design of Buildings(GB50011-2001),which provides a reference provided for design methods and engineering application of edge joints for reinforced concrete flat beams.
It is compared and analyzed that the failure mechanism,bearing capacity,deformation and rupture forms of edge joints through loading test with and without reinforced concrete flat beams,whose width height ratio is 3.It is also made a breakthrough at the requirements for section width limit of flat beams in Code for Seismic Design of Buildings(GB50011-2001),which provides a reference provided for design methods and engineering application of edge joints for reinforced concrete flat beams.
2007, 37(7): 36-38.
doi: 10.13204/j.gyjz200707012
Abstract:
Based on plane assumption and large and small eccentric compression limitation,the ultimate axial compression ratio of reinforced concrete L-shaped columns is computed when the ratio of length to thickness of section is less than 2.5,by the section Gauss numerical integration method.The following main conclusions can be drawn: the ultimate axial compression ratio of L-shaped columns is affected by different loading angles.The ultimate axial compression ratio reduces with the increasing of the ratio of length to thickness of sections.The ultimate axial compression ratio at the worst loading angle should be satisfied,and the ratio of length to thickness of sections should not be too large in practice design.
Based on plane assumption and large and small eccentric compression limitation,the ultimate axial compression ratio of reinforced concrete L-shaped columns is computed when the ratio of length to thickness of section is less than 2.5,by the section Gauss numerical integration method.The following main conclusions can be drawn: the ultimate axial compression ratio of L-shaped columns is affected by different loading angles.The ultimate axial compression ratio reduces with the increasing of the ratio of length to thickness of sections.The ultimate axial compression ratio at the worst loading angle should be satisfied,and the ratio of length to thickness of sections should not be too large in practice design.
2007, 37(7): 39-43.
doi: 10.13204/j.gyjz200707013
Abstract:
At present the analysis of super-long frame structure always assumes the same temperature distribution as the concrete temperature field under construction and use.Yet they are different actually;and it is obtained from calculation that the slab temperature stress will be greatly increased and the internal force and displacement of the member of the structure will be varied when considering lagging in temperature change of beam.
At present the analysis of super-long frame structure always assumes the same temperature distribution as the concrete temperature field under construction and use.Yet they are different actually;and it is obtained from calculation that the slab temperature stress will be greatly increased and the internal force and displacement of the member of the structure will be varied when considering lagging in temperature change of beam.
THE EFFECT OF DAMPING SYSTEM PARAMETERS OF CONVERSION LAYER FOR BOTTOM FRAME ON ASEISMIC PERFORMANCE
2007, 37(7): 44-46.
doi: 10.13204/j.gyjz200707014
Abstract:
Bottom frame is a common structural form.A new antiseismic method by setting shock insulation in conversion layer is presented in order to avoid setting too many earthquake resisting walls.The dynamic equation of structure is set up and antiseismic characteristic of this structure affected by variable parameters is analysed.The distinct antiseismic effect can be obtained after chosing rational parameters of damping component.
Bottom frame is a common structural form.A new antiseismic method by setting shock insulation in conversion layer is presented in order to avoid setting too many earthquake resisting walls.The dynamic equation of structure is set up and antiseismic characteristic of this structure affected by variable parameters is analysed.The distinct antiseismic effect can be obtained after chosing rational parameters of damping component.
2007, 37(7): 47-52.
doi: 10.13204/j.gyjz200707015
Abstract:
Based on the finite element program ADINA,a 3D finite element study considering the boundary condition and the contact condition is used to determine the pile-soil-pile interaction behaviour for closely spaced square passive pile rows.The mechanism of soil arching,the relation of the pile deflection and the surface load,the soil pressure of the side of pile and the axial force are studied.It is shown that the nonlinear relation between the pile deflection and the surface load can be modeled by three broken model. The earth pressure on the side of pile is smaller than the Rankine passive pressure and larger than the Rankine active pressure.The ultimate pressure on the piles in the same soil shows linear and smaller than that by the Ito theory and the Shen Zhujiang's theory.
Based on the finite element program ADINA,a 3D finite element study considering the boundary condition and the contact condition is used to determine the pile-soil-pile interaction behaviour for closely spaced square passive pile rows.The mechanism of soil arching,the relation of the pile deflection and the surface load,the soil pressure of the side of pile and the axial force are studied.It is shown that the nonlinear relation between the pile deflection and the surface load can be modeled by three broken model. The earth pressure on the side of pile is smaller than the Rankine passive pressure and larger than the Rankine active pressure.The ultimate pressure on the piles in the same soil shows linear and smaller than that by the Ito theory and the Shen Zhujiang's theory.
2007, 37(7): 53-57.
doi: 10.13204/j.gyjz200707016
Abstract:
The displacement of soil influences soil pressure acting on retaining structure greatly.Therefore,the mechanical analysis considering deformation is put forward.The soil pressure expressions considering displacement are adopted if displacement ranging between 0 and ultimate magnitude,while the soil pressure expressions considering sliding surface are adopted for outside the ultimate displacement.The displacement making soil achieve to ultimate state can be obtained by former researchers.The results of soil pressure expressions are identical with the results of centrifugal model experiment and finite element method.The consistency attests to the rationality of expressions.In addition,the soil pressure calculation formula can be applied to practical case and guided for construction perfectly.
The displacement of soil influences soil pressure acting on retaining structure greatly.Therefore,the mechanical analysis considering deformation is put forward.The soil pressure expressions considering displacement are adopted if displacement ranging between 0 and ultimate magnitude,while the soil pressure expressions considering sliding surface are adopted for outside the ultimate displacement.The displacement making soil achieve to ultimate state can be obtained by former researchers.The results of soil pressure expressions are identical with the results of centrifugal model experiment and finite element method.The consistency attests to the rationality of expressions.In addition,the soil pressure calculation formula can be applied to practical case and guided for construction perfectly.
2007, 37(7): 58-59.
doi: 10.13204/j.gyjz200707017
Abstract:
Through generalizing the shear displacement method to compute settlement of single pile in multi-layered soils,the corresponding theoretic formulas are derived,with which settlement,distribution of axial force,displacement of single pile and side friction of single pile along the depth in multi-layered soils can be easily attained.
Through generalizing the shear displacement method to compute settlement of single pile in multi-layered soils,the corresponding theoretic formulas are derived,with which settlement,distribution of axial force,displacement of single pile and side friction of single pile along the depth in multi-layered soils can be easily attained.
2007, 37(7): 60-62.
doi: 10.13204/j.gyjz200707018
Abstract:
As the developing of technology,more and more fiber glass cloths are used in the domain to reinforce concrete in recent years,but the reinforcing technology of fiber glass cloths was not used in corrosion protection project.By the analysis of anti-corrosion data on concrete reinforced,it is concluded that the concrete reinforced with fiber glass cloths has excellent property of corrosion protection and the result indicates that this technology can be used to reinforce building structure of concrete members subjected to corrosive environments.
As the developing of technology,more and more fiber glass cloths are used in the domain to reinforce concrete in recent years,but the reinforcing technology of fiber glass cloths was not used in corrosion protection project.By the analysis of anti-corrosion data on concrete reinforced,it is concluded that the concrete reinforced with fiber glass cloths has excellent property of corrosion protection and the result indicates that this technology can be used to reinforce building structure of concrete members subjected to corrosive environments.
2007, 37(7): 63-65.
doi: 10.13204/j.gyjz200707019
Abstract:
The excellent flexural toughness of steel fiber reinforced concrete has been testified by experimental studies and practice of project,and in Technical Specification of Fiber Reinforced Concrete Structure(CSCS 38∶2004),the toughness index is used in the designing of industrial structure ground and shoring of tunnel,but it is different that based on ASTM C1018.In this study,by the experiment on flexural toughness of the steel fiber reinforced concrete specimen,the index is calculated by various methods,and the influence of the volume ratio and concrete strength is studied.
The excellent flexural toughness of steel fiber reinforced concrete has been testified by experimental studies and practice of project,and in Technical Specification of Fiber Reinforced Concrete Structure(CSCS 38∶2004),the toughness index is used in the designing of industrial structure ground and shoring of tunnel,but it is different that based on ASTM C1018.In this study,by the experiment on flexural toughness of the steel fiber reinforced concrete specimen,the index is calculated by various methods,and the influence of the volume ratio and concrete strength is studied.
2007, 37(7): 66-69.
doi: 10.13204/j.gyjz200707020
Abstract:
The key to engineering and experiment is the bond performance between CFRP and the concrete.It was analyzed the bond-slip model for the CFRP-concrete interface from the theoretical viewpoint and was deduced the effective bond length and the bond stress formula.The results by the formulas were compared with the results of experiments and other articles,the values calculated by the effective bond length formula were found to closely match with the results of experiments. The further amendments of the bond stress formula were discussed according to the experiences and experiments.
The key to engineering and experiment is the bond performance between CFRP and the concrete.It was analyzed the bond-slip model for the CFRP-concrete interface from the theoretical viewpoint and was deduced the effective bond length and the bond stress formula.The results by the formulas were compared with the results of experiments and other articles,the values calculated by the effective bond length formula were found to closely match with the results of experiments. The further amendments of the bond stress formula were discussed according to the experiences and experiments.
2007, 37(7): 70-72.
doi: 10.13204/j.gyjz200707021
Abstract:
Some factors influencing dry-shrinkage factor and bulking factor of GRC plate and the corresponding levels were studied,and some key factors and influencing laws were found through orthogonal experiment.The influence sequence of these key factors and relationship with dry-shrinkage and bulking performance were presented by theoretical analysis.According to experimental,theoretical results and equilibrium analysis,several matched groups that could brought good dry-shrinkage and bulking performance were obtained,and the corresponding performance indexes were estimated.An experimental and theoretical gist for design and practical application of GRC plate desired to used for formwork could be provided.
Some factors influencing dry-shrinkage factor and bulking factor of GRC plate and the corresponding levels were studied,and some key factors and influencing laws were found through orthogonal experiment.The influence sequence of these key factors and relationship with dry-shrinkage and bulking performance were presented by theoretical analysis.According to experimental,theoretical results and equilibrium analysis,several matched groups that could brought good dry-shrinkage and bulking performance were obtained,and the corresponding performance indexes were estimated.An experimental and theoretical gist for design and practical application of GRC plate desired to used for formwork could be provided.
2007, 37(7): 73-77.
doi: 10.13204/j.gyjz200707022
Abstract:
Wind tunnel tests are the most important,direct and efficient means for wind engineering research.The construction and development of boundary layer wind tunnel will play a crucial role for the improvement of quality and efficiency of wind tunnel test.The development of wind tunnel in applications to civil engineering was introduced firstly,and then three wind tunnels which have the capability of simulating the combined actions of wind and wave was discussed.Finally,some advices were put forward for how to promote the construction of wind tunnel in China.
Wind tunnel tests are the most important,direct and efficient means for wind engineering research.The construction and development of boundary layer wind tunnel will play a crucial role for the improvement of quality and efficiency of wind tunnel test.The development of wind tunnel in applications to civil engineering was introduced firstly,and then three wind tunnels which have the capability of simulating the combined actions of wind and wave was discussed.Finally,some advices were put forward for how to promote the construction of wind tunnel in China.
2007, 37(7): 78-81.
doi: 10.13204/j.gyjz200707023
Abstract:
Based on the analyses of earthquake failure,the failure experiment on four full-size specimens of steel frame beam-column welding connections under cyclic loading is accomplished,taking account of influencing factor in form of scallop structure.According to a comparison of moment-plastic corner cure with moment-cumulative plastic deformation multiple cure,the test results show that scallop structure and steel tab are the primary factors influencing the plastic deformation capacity and failure mode of beam-column connections.Improving the scallop structure is an effective means,which can improve not only the aseismic behavior but also the construction technique is the same as the traditional connections.
Based on the analyses of earthquake failure,the failure experiment on four full-size specimens of steel frame beam-column welding connections under cyclic loading is accomplished,taking account of influencing factor in form of scallop structure.According to a comparison of moment-plastic corner cure with moment-cumulative plastic deformation multiple cure,the test results show that scallop structure and steel tab are the primary factors influencing the plastic deformation capacity and failure mode of beam-column connections.Improving the scallop structure is an effective means,which can improve not only the aseismic behavior but also the construction technique is the same as the traditional connections.
2007, 37(7): 82-84.
doi: 10.13204/j.gyjz200707024
Abstract:
A subspace iteration method is adopted in order to acquire frequencies and modes of steel suspending cofferdam that is usually used in the construction of bridge pier.And also dynamic response of this structure under wind load is obtained using spectrum analysis method.The analytic results show that pulsant wind load has little effect on dynamic response of structure,then suggestions are made that during structure design gust response factor should be adopted to calculate the displacement response of steel suspending cofferdam.
A subspace iteration method is adopted in order to acquire frequencies and modes of steel suspending cofferdam that is usually used in the construction of bridge pier.And also dynamic response of this structure under wind load is obtained using spectrum analysis method.The analytic results show that pulsant wind load has little effect on dynamic response of structure,then suggestions are made that during structure design gust response factor should be adopted to calculate the displacement response of steel suspending cofferdam.
2007, 37(7): 85-88.
doi: 10.13204/j.gyjz200707025
Abstract:
Based on the structure property of space truss,it is suggested to use vibration energy dissipation method for reducing earthquake response.The detailed precept includes the following two different ways: using fluid viscous damper as additional elements or using viscoelastic damper to replace the elements.In a case of a pyramid space truss model seismic response is compared before and after seismic mitigation.Calculation results show the methods mentioned above are effective.Furthermore the influence of change in damper locations on the vibration reduction is investigated.
Based on the structure property of space truss,it is suggested to use vibration energy dissipation method for reducing earthquake response.The detailed precept includes the following two different ways: using fluid viscous damper as additional elements or using viscoelastic damper to replace the elements.In a case of a pyramid space truss model seismic response is compared before and after seismic mitigation.Calculation results show the methods mentioned above are effective.Furthermore the influence of change in damper locations on the vibration reduction is investigated.
2007, 37(7): 89-91.
doi: 10.13204/j.gyjz200707026
Abstract:
Taking Tianjin Cihai Bridge as the background,a structural system composed of new cable-stayed bridge with giant wheel is studied to find a more reasonable structural system for Cihai Bridge.On the basis of introducing the general situation of Cihai Bridge,the structural characteristic and load transferring trait are analyzed.It is pointed out that the loads are mainly borne by axial force system.Two structure systems are put forward,one is two-side cable + truss structure system(structural system A),the other is four-side cable + suspension structure system(structural system B).The two structural systems are studied and compared from the aspect of composition,structure and construction.And it comes to that the structural system B is a more rational one.
Taking Tianjin Cihai Bridge as the background,a structural system composed of new cable-stayed bridge with giant wheel is studied to find a more reasonable structural system for Cihai Bridge.On the basis of introducing the general situation of Cihai Bridge,the structural characteristic and load transferring trait are analyzed.It is pointed out that the loads are mainly borne by axial force system.Two structure systems are put forward,one is two-side cable + truss structure system(structural system A),the other is four-side cable + suspension structure system(structural system B).The two structural systems are studied and compared from the aspect of composition,structure and construction.And it comes to that the structural system B is a more rational one.
2007, 37(7): 92-95.
doi: 10.13204/j.gyjz200707027
Abstract:
The longitudinal shuttle-shaped columns,as a new type of structural member loaded axially,have been extended into many public buildings recently because of their special and beautiful appearance.Which may be classified into a solid-web section shuttle-shaped column and a build-up section shuttle-shaped column.The latter is called generally as shuttle-shape latticed column formed by longitudinal steel tubes behaving as branches and horizontals steel tubes behaving as batten plates. Instability behavior and design method of both solid-web section shuttleshaped column and shuttle-shape latticed column are presented.The material and geometric nonlinear FE analysis program(ANSYS) is employed to investigate theoretically the influence of the geometric parameters on the buckling behavior and failure mechanism of both columns.These geometric parameters include column length,column slenderness ratio,single branch tube slenderness ratio,the number of diaphragms and thickness of diaphragms tube.By varying these parameters mentioned above the elastic buckling load and corresponding buckling mode of SLC are investigated respectively.And an ultimate strength of SLC is studied and concluded finally.A new and interesting failure mechanism is found from the numerical results obtained and a useful design method for checking overall instability is drawn for practical project design.
The longitudinal shuttle-shaped columns,as a new type of structural member loaded axially,have been extended into many public buildings recently because of their special and beautiful appearance.Which may be classified into a solid-web section shuttle-shaped column and a build-up section shuttle-shaped column.The latter is called generally as shuttle-shape latticed column formed by longitudinal steel tubes behaving as branches and horizontals steel tubes behaving as batten plates. Instability behavior and design method of both solid-web section shuttleshaped column and shuttle-shape latticed column are presented.The material and geometric nonlinear FE analysis program(ANSYS) is employed to investigate theoretically the influence of the geometric parameters on the buckling behavior and failure mechanism of both columns.These geometric parameters include column length,column slenderness ratio,single branch tube slenderness ratio,the number of diaphragms and thickness of diaphragms tube.By varying these parameters mentioned above the elastic buckling load and corresponding buckling mode of SLC are investigated respectively.And an ultimate strength of SLC is studied and concluded finally.A new and interesting failure mechanism is found from the numerical results obtained and a useful design method for checking overall instability is drawn for practical project design.
2007, 37(7): 96-99.
doi: 10.13204/j.gyjz200707028
Abstract:
It is very important to analyze the forces at concrete-CFRP sheets interface after the tension of CFRP sheets in the technology of strengthening a concrete beam with the prestressed CFRP sheets.The maximum initial prestress that can be applied to CFRP sheets is also concerned in the research.It is obtained the changing law of the tensioned CFRP sheets-concrete interfacial shear stress and its calculation method based on CFRP sheets-concrete bilinear shear-slip model.According to which it is proposed the maximum initial prestress that can be applied to CFRP sheets.
It is very important to analyze the forces at concrete-CFRP sheets interface after the tension of CFRP sheets in the technology of strengthening a concrete beam with the prestressed CFRP sheets.The maximum initial prestress that can be applied to CFRP sheets is also concerned in the research.It is obtained the changing law of the tensioned CFRP sheets-concrete interfacial shear stress and its calculation method based on CFRP sheets-concrete bilinear shear-slip model.According to which it is proposed the maximum initial prestress that can be applied to CFRP sheets.
2007, 37(7): 100-103.
doi: 10.13204/j.gyjz200707029
Abstract:
Under the long-term effects of various factors,materials of building will gradually aging;various levels of cracking,steel corrosion,spalling and carbonation of concrete appear at frame members,which leads to degeneration of structural properties and decline of structural reliability.Therefore,how to detect,reinforce and repair the historic building is worthy of study and discussion for engineers.Based on a building built in the early 1930s,the detection is implemented,and in accordance with the principle of renewals the function of the building but keeps the appearance of the building reservating,the related reinforcement design and methods are proposed to meet the requirements of good performances of this building.
Under the long-term effects of various factors,materials of building will gradually aging;various levels of cracking,steel corrosion,spalling and carbonation of concrete appear at frame members,which leads to degeneration of structural properties and decline of structural reliability.Therefore,how to detect,reinforce and repair the historic building is worthy of study and discussion for engineers.Based on a building built in the early 1930s,the detection is implemented,and in accordance with the principle of renewals the function of the building but keeps the appearance of the building reservating,the related reinforcement design and methods are proposed to meet the requirements of good performances of this building.
2007, 37(7): 104-107.
doi: 10.13204/j.gyjz200707030
Abstract:
According to the static tests of 8 rectangular timber beams strengthened with carbon fiber reinforced polymer(CFRP) sheets,the bending behaviors are studied such as failure characteristics,ultimate bearing capacity,rigidity,strain of timber section and CFRP sheets at the ends.The results show that CFRP sheets have a good strengthening effect for timber beam.This paper supplies a new method and test reference for repairing and strengthening of Chinese ancient timber buildings.
According to the static tests of 8 rectangular timber beams strengthened with carbon fiber reinforced polymer(CFRP) sheets,the bending behaviors are studied such as failure characteristics,ultimate bearing capacity,rigidity,strain of timber section and CFRP sheets at the ends.The results show that CFRP sheets have a good strengthening effect for timber beam.This paper supplies a new method and test reference for repairing and strengthening of Chinese ancient timber buildings.
2007, 37(7): 108-110.
doi: 10.13204/j.gyjz200707031
Abstract:
It is presented the inspection and strengthening to a RC structure in a waiting building of a bus station.After a thorough inspection,the causes of structural cracks and flaw are examined,furthermore the safety of structure is analyzed.A method of structural strengthening is proposed so that the safety and durability of the structure can be ensured under the normal uses.
It is presented the inspection and strengthening to a RC structure in a waiting building of a bus station.After a thorough inspection,the causes of structural cracks and flaw are examined,furthermore the safety of structure is analyzed.A method of structural strengthening is proposed so that the safety and durability of the structure can be ensured under the normal uses.
2007, 37(7): 111-114.
doi: 10.13204/j.gyjz200707032
Abstract:
The precast reinforced concrete slab house is a representative of industrialized production technology of houses in Japan,Yet it is very difficult for a high value-added production to meet the diversified design requirements of householders.The alteration of production can directly affect the development of future house production.Through the investigation on production of typical PC houses in Japan,it is expounded the reasons of high value-added production of PC houses and its alteration.Particularly there has a definite cognition of a subject for improving productivity of houses by excluding electric embedded parts,thus meeting the diversified design requirements of householders.
The precast reinforced concrete slab house is a representative of industrialized production technology of houses in Japan,Yet it is very difficult for a high value-added production to meet the diversified design requirements of householders.The alteration of production can directly affect the development of future house production.Through the investigation on production of typical PC houses in Japan,it is expounded the reasons of high value-added production of PC houses and its alteration.Particularly there has a definite cognition of a subject for improving productivity of houses by excluding electric embedded parts,thus meeting the diversified design requirements of householders.
2007, 37(7): 115-116.
doi: 10.13204/j.gyjz200707033
Abstract:
During the design of yangshan Xiyin Temple,it is attempted to give the readers the meaning of respecting the history,conforming to the landform,and protecting the environment.In this design,we also carry on the Buddhism temple's special layout and seek the deep significance of the Buddhist space.
During the design of yangshan Xiyin Temple,it is attempted to give the readers the meaning of respecting the history,conforming to the landform,and protecting the environment.In this design,we also carry on the Buddhism temple's special layout and seek the deep significance of the Buddhist space.
