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2007 Vol. 37, No. 1
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2007, 37(1): 1-3,7.
doi: 10.13204/j.gyjz200701001
Abstract:
Combined the creation of the national fencing exercise hall,it was elaborated how to carry out the basic design idea,that is form follows function.At the same time,the Chinese architects were called on to create the best construction works by the purest succinct design.Finally we could have our field in the world's architectural stage.
Combined the creation of the national fencing exercise hall,it was elaborated how to carry out the basic design idea,that is form follows function.At the same time,the Chinese architects were called on to create the best construction works by the purest succinct design.Finally we could have our field in the world's architectural stage.
2007, 37(1): 4-7,3.
doi: 10.13204/j.gyjz200701002
Abstract:
Taking ping-pong gyrnnasium for Beijing 2008 Olympic Games,Zhengzhou International Conference and Exhibition Center and Nantong Stadium for Examples,it is analyzed the structure technology and art expression of large-span roofs from three aspectsspirit,environment and nature.
Taking ping-pong gyrnnasium for Beijing 2008 Olympic Games,Zhengzhou International Conference and Exhibition Center and Nantong Stadium for Examples,it is analyzed the structure technology and art expression of large-span roofs from three aspectsspirit,environment and nature.
2007, 37(1): 8-11,46.
doi: 10.13204/j.gyjz200701003
Abstract:
The suspend-dome with span of 98m,rise of 9.3m and rise-span ratio 1/10 is adopted in Badminton Gym for 2008 Olympic Games.Analyses including force,displacement,eigenvalue buckling and nonlinear buckling to suspend-dome and single layer shell are conducted separately,the proof of selecting suspend-dome is provided.Programs with the axis force and joint displacement of upper dome as object function are developed respectively,the effective method of prestress level is researched.The influence of initial geometrical defect on the integral stability is studied and the method of applying initial geometrical defect is developed.
The suspend-dome with span of 98m,rise of 9.3m and rise-span ratio 1/10 is adopted in Badminton Gym for 2008 Olympic Games.Analyses including force,displacement,eigenvalue buckling and nonlinear buckling to suspend-dome and single layer shell are conducted separately,the proof of selecting suspend-dome is provided.Programs with the axis force and joint displacement of upper dome as object function are developed respectively,the effective method of prestress level is researched.The influence of initial geometrical defect on the integral stability is studied and the method of applying initial geometrical defect is developed.
2007, 37(1): 12-15.
doi: 10.13204/j.gyjz200701004
Abstract:
The roof structure system of the National Gymnasium is bidirectional truss string structure.As a new structure system,the shape and structural behavior of the joints are more complicated,the design of the joints is extremely difficult. The design process of the post end joints and the cast steel joints at the end of the cable is introduced.The calculation and experimental study about the slide-resistant behavior between the cable and the post down end joint are carried out.The joint plan and test data can be referenced by other similar projects.
The roof structure system of the National Gymnasium is bidirectional truss string structure.As a new structure system,the shape and structural behavior of the joints are more complicated,the design of the joints is extremely difficult. The design process of the post end joints and the cast steel joints at the end of the cable is introduced.The calculation and experimental study about the slide-resistant behavior between the cable and the post down end joint are carried out.The joint plan and test data can be referenced by other similar projects.
2007, 37(1): 16-19.
doi: 10.13204/j.gyjz200701005
Abstract:
It has been studied the prestressing construction technology of bidirectional truss string structure of the National Gymnasium.The two methods of tensioning cables are compared from three aspects: cable forces,axial stress and vertical displacements.From the experimental results it has been decided which method is better to complete prestressing construction.The conclusion can be referenced by other similar projects.
It has been studied the prestressing construction technology of bidirectional truss string structure of the National Gymnasium.The two methods of tensioning cables are compared from three aspects: cable forces,axial stress and vertical displacements.From the experimental results it has been decided which method is better to complete prestressing construction.The conclusion can be referenced by other similar projects.
2007, 37(1): 20-22,65.
doi: 10.13204/j.gyjz200701006
Abstract:
It is introduced the structural design of the gymnasium for University of Science and Technology of Beijingjudo and tae kwon do gymnasium for Beijing Olympic Games,including choice of structural system,features of structural global analysis,features of foundation and bases design,solutions of the problem of large dimensions of the structure,prestressed concrete design of large span plates,and so on.
It is introduced the structural design of the gymnasium for University of Science and Technology of Beijingjudo and tae kwon do gymnasium for Beijing Olympic Games,including choice of structural system,features of structural global analysis,features of foundation and bases design,solutions of the problem of large dimensions of the structure,prestressed concrete design of large span plates,and so on.
2007, 37(1): 23-25,19.
doi: 10.13204/j.gyjz200701007
Abstract:
By introducing the structural design features of large-span prestressed hollow plate with cast-in-situ concrete of shooting gym for Beijing Olympic Games,it is expounded section determination of the hollow plate,and is also described some structural measures and construction requirements.
By introducing the structural design features of large-span prestressed hollow plate with cast-in-situ concrete of shooting gym for Beijing Olympic Games,it is expounded section determination of the hollow plate,and is also described some structural measures and construction requirements.
2007, 37(1): 26-29.
doi: 10.13204/j.gyjz200701008
Abstract:
The Olympic Training Stadium is built for 2008 Olympic Games.The beam string structure with viable span is used for the stadium.The steel structure and prestressing construction technology are described in detail.According to the construction simulation results and site construction monitoring result,the features of prestress and steel structure construction of the structure are proposed.
The Olympic Training Stadium is built for 2008 Olympic Games.The beam string structure with viable span is used for the stadium.The steel structure and prestressing construction technology are described in detail.According to the construction simulation results and site construction monitoring result,the features of prestress and steel structure construction of the structure are proposed.
2007, 37(1): 30-33.
doi: 10.13204/j.gyjz200701009
Abstract:
For the project of erecting the steel structures of the national stadium,the main truss was divided into two lifting elements,i.e.space 3-D truss and 2-D truss according to the actual conditions.Therefore,the multiport-butt of 3-D truss,as well as the stability of turning over 2-D truss were the difficulties of the lifting project.
For the project of erecting the steel structures of the national stadium,the main truss was divided into two lifting elements,i.e.space 3-D truss and 2-D truss according to the actual conditions.Therefore,the multiport-butt of 3-D truss,as well as the stability of turning over 2-D truss were the difficulties of the lifting project.
2007, 37(1): 34-37,72.
doi: 10.13204/j.gyjz200701010
Abstract:
It it explored that some thinkings about architectural regionalization and modernization under special conditions,according to analyzing the design scheme of Naidong County Government Working Center in Shannan District of Tibet.It is attempted to seek the deep-level intension under the form of traditional architectures,and carry forward the contents with current meanings in the traditional architectures,so as to integrate tradition with modern times harmonically by multielement renewable method.
It it explored that some thinkings about architectural regionalization and modernization under special conditions,according to analyzing the design scheme of Naidong County Government Working Center in Shannan District of Tibet.It is attempted to seek the deep-level intension under the form of traditional architectures,and carry forward the contents with current meanings in the traditional architectures,so as to integrate tradition with modern times harmonically by multielement renewable method.
2007, 37(1): 38-41.
doi: 10.13204/j.gyjz200701011
Abstract:
The Dai's traditional buildings are known as environmental friendly.But the construction of the Dai's new houses are exertting a strong influence on the environment of the Dai's village.It is presented a tentative review to some structure systems which are popularly used in these newly built Dai's houses.Based on this and on the view of sustainable development,we are deeply thinking about the reviving of Dai's bamboo houses and presented some techanical tactics on the issues of how to resurge Dai's bamboo houses.
The Dai's traditional buildings are known as environmental friendly.But the construction of the Dai's new houses are exertting a strong influence on the environment of the Dai's village.It is presented a tentative review to some structure systems which are popularly used in these newly built Dai's houses.Based on this and on the view of sustainable development,we are deeply thinking about the reviving of Dai's bamboo houses and presented some techanical tactics on the issues of how to resurge Dai's bamboo houses.
2007, 37(1): 42-46,11.
doi: 10.13204/j.gyjz200701012
Abstract:
After analyzing the general regulation of temperature changes in nature,some climate factors that influence temperature effect to structure are analyzed.The climate factors are mainly sunshine radiation,the temperature,the wind speed.The research aimed at the reaction of different concrete structures,such as bridge structure,building structure,the mass concrete structure and special structure,to temperature changes caused by the sunshine temperature difference and by sudden decrease of temperature.Considering the situation that temperature effect is only considered by construction according to the present design code of concrete structure,it is proposed to consider temperature effect combination in the design of concrete structure.
After analyzing the general regulation of temperature changes in nature,some climate factors that influence temperature effect to structure are analyzed.The climate factors are mainly sunshine radiation,the temperature,the wind speed.The research aimed at the reaction of different concrete structures,such as bridge structure,building structure,the mass concrete structure and special structure,to temperature changes caused by the sunshine temperature difference and by sudden decrease of temperature.Considering the situation that temperature effect is only considered by construction according to the present design code of concrete structure,it is proposed to consider temperature effect combination in the design of concrete structure.
2007, 37(1): 47-51.
doi: 10.13204/j.gyjz200701013
Abstract:
With the application of concrete-filled steel tubular member to mega-frame structures,the connection forms of main beam-column can be classified as welded rigid connection,bolted gemel connection and semi-rigid connection.The results of a 24-story mega-frame structure with 4 spans were calculated by the universal finite element method of MIDAS,the different structural character values such as structural free vibration periods,structural displacements and structural moments were compared,the influence of connection form of main frame beam-column on behaviors of mega-frame structure were discussed,and smoe reasonable suggestions were put forward to guide engineering practice.
With the application of concrete-filled steel tubular member to mega-frame structures,the connection forms of main beam-column can be classified as welded rigid connection,bolted gemel connection and semi-rigid connection.The results of a 24-story mega-frame structure with 4 spans were calculated by the universal finite element method of MIDAS,the different structural character values such as structural free vibration periods,structural displacements and structural moments were compared,the influence of connection form of main frame beam-column on behaviors of mega-frame structure were discussed,and smoe reasonable suggestions were put forward to guide engineering practice.
2007, 37(1): 52-56.
doi: 10.13204/j.gyjz200701014
Abstract:
In the reliability estimation and inspection of existing structures,the working stress state of a RC structure is an important index related with structural behavior,but there was not a reliable testing method by which one can obtain the working stress in a RC structure.After having analyzed the common test methods of working stress briefly,the boring-electrical test method is proposed to test the working stress of RC compression member.The working stress of the RC compression member in existing structures can be calculated through measuring strain change before and after drilling the hole,determining the compressive strength and elastic modulus of concrete through the drilled sample and combining the calculating results of the finite element method.The tested results show that the actual release strains at the edges of the hole agreed well with those of computed by the finite element method,so the boring-electrical test method can be used to test working stress of practical RC compression member.
In the reliability estimation and inspection of existing structures,the working stress state of a RC structure is an important index related with structural behavior,but there was not a reliable testing method by which one can obtain the working stress in a RC structure.After having analyzed the common test methods of working stress briefly,the boring-electrical test method is proposed to test the working stress of RC compression member.The working stress of the RC compression member in existing structures can be calculated through measuring strain change before and after drilling the hole,determining the compressive strength and elastic modulus of concrete through the drilled sample and combining the calculating results of the finite element method.The tested results show that the actual release strains at the edges of the hole agreed well with those of computed by the finite element method,so the boring-electrical test method can be used to test working stress of practical RC compression member.
2007, 37(1): 57-61,68.
doi: 10.13204/j.gyjz200701015
Abstract:
Raft foundations are widely empolyed for high-rise buildings or multi-rise structures founded on soft ground.Therefore the interaction of superstructure,raft foundation and subsoil gets to be considerably significant in the analysis and design of major structures on soft ground with raft foundation.In actual,the conventional methods in engineering design cannot duly reproduce the interaction mechanism of the system and cannot accurately predict the variation characteristics of both internal forces and deformations of raft foundation.At the same time,the 2-D numerical analysis of interaction system cannot manifest the three-dimensional effect of the interaction.Therefore,both the elasto-plastic behaviour and the contributions of stiffness of superstructure and raft foundation are considered and three dimensional numerical analyses of interaction system consisting of superstructure,raft foundation and subsoil are conducted by using FEM.Through the comparactive studies,it is shown that while the spatial effect is taken into consideration,the stiffness of both superstructure and raft foundation has a definite effect on both internal forces and deformations of interaction system with different characteristics.However such an effect is limited to a certain extent.Furthermore,the effect of second stress and the transferring of loading sharing of superstructure cannot be overlooked in engineering design.
Raft foundations are widely empolyed for high-rise buildings or multi-rise structures founded on soft ground.Therefore the interaction of superstructure,raft foundation and subsoil gets to be considerably significant in the analysis and design of major structures on soft ground with raft foundation.In actual,the conventional methods in engineering design cannot duly reproduce the interaction mechanism of the system and cannot accurately predict the variation characteristics of both internal forces and deformations of raft foundation.At the same time,the 2-D numerical analysis of interaction system cannot manifest the three-dimensional effect of the interaction.Therefore,both the elasto-plastic behaviour and the contributions of stiffness of superstructure and raft foundation are considered and three dimensional numerical analyses of interaction system consisting of superstructure,raft foundation and subsoil are conducted by using FEM.Through the comparactive studies,it is shown that while the spatial effect is taken into consideration,the stiffness of both superstructure and raft foundation has a definite effect on both internal forces and deformations of interaction system with different characteristics.However such an effect is limited to a certain extent.Furthermore,the effect of second stress and the transferring of loading sharing of superstructure cannot be overlooked in engineering design.
2007, 37(1): 62-65,22.
doi: 10.13204/j.gyjz200701016
Abstract:
It is presented the application of spline element and state space precision method to analysze dynamic response of plates on elastic foundation.The spline element analysis is applied in space domain and the state space precision method is used in time domain.In the process of calculation,the computing program is convenient and efficient,there needs no solving of the linear equations and the space precision method is applied directly.The numerical examples are presented,and the results are compared with other methods.The computational results are quite good.
It is presented the application of spline element and state space precision method to analysze dynamic response of plates on elastic foundation.The spline element analysis is applied in space domain and the state space precision method is used in time domain.In the process of calculation,the computing program is convenient and efficient,there needs no solving of the linear equations and the space precision method is applied directly.The numerical examples are presented,and the results are compared with other methods.The computational results are quite good.
2007, 37(1): 66-68,61.
doi: 10.13204/j.gyjz200701017
Abstract:
By computation and practical example of running machine,it is shown that the frame foundation under high-frequency machine should not be designed in design principle of avoiding resonance,but should be designed in contral principle of vibration amplitude.Meanwhile,it is shown that the effect of variation of damping ratio on the vibration-amplitudes is only in a small degree in consequence of multi-vibration-model's attending the vibration.
By computation and practical example of running machine,it is shown that the frame foundation under high-frequency machine should not be designed in design principle of avoiding resonance,but should be designed in contral principle of vibration amplitude.Meanwhile,it is shown that the effect of variation of damping ratio on the vibration-amplitudes is only in a small degree in consequence of multi-vibration-model's attending the vibration.
2007, 37(1): 69-72,37.
doi: 10.13204/j.gyjz200701018
Abstract:
According to the characteristics of foundation pit and adjacent building and surrounding circumstance,some reasonable measures are given to protect the safety of adjacent building based on displacement control,such as prestressed anchor for limitation to lateral displacement of foundation pit,as well as root pile for foundation underpinning of adjacent building to increase its stiffness.
According to the characteristics of foundation pit and adjacent building and surrounding circumstance,some reasonable measures are given to protect the safety of adjacent building based on displacement control,such as prestressed anchor for limitation to lateral displacement of foundation pit,as well as root pile for foundation underpinning of adjacent building to increase its stiffness.
2007, 37(1): 73-76,102.
doi: 10.13204/j.gyjz200701019
Abstract:
In order to disscus the influencing factors of compressive strength of plastic concrete,the reasonable testing method of compressive strength of plastic concrete was given and series comparative tests have been accomplished aiming at raw materials and maintenance condition of plastic concrete.According to analysing the influencing factors of compressive strength of plastic concrete in detail,the influencing rule of each factor to the compressive strength of plastic concrete was drawn.The results indicate that less dosage of water,clay,bentonite and larger dosage of cement,and mixing coal ash and admixture can increase compressive strength of plastic concrete.
In order to disscus the influencing factors of compressive strength of plastic concrete,the reasonable testing method of compressive strength of plastic concrete was given and series comparative tests have been accomplished aiming at raw materials and maintenance condition of plastic concrete.According to analysing the influencing factors of compressive strength of plastic concrete in detail,the influencing rule of each factor to the compressive strength of plastic concrete was drawn.The results indicate that less dosage of water,clay,bentonite and larger dosage of cement,and mixing coal ash and admixture can increase compressive strength of plastic concrete.
2007, 37(1): 77-81,92.
doi: 10.13204/j.gyjz200701020
Abstract:
The usual fiber concrete is not widely used in high bridge tower due to bad pumping performance.Experiments were concentrated on pumpability,plastic shrinkage and drying shrinkage of the anchorage concrete.Based on the advanced multi-compound technique,the fiber concrete mix design was modified to ensure good pumpability.The effect of hot weather conditions on plastic shrinkage cracking of high performance concrete(HPC) and special high performance steel fiber-reinforced concrete(HPSFRC) have been analysised by the method of artificial imitation in the lab.The effect of fiber content and shrinkage-reducing agent(SRA) on plastic shrinkage cracking and drying shrinkage of HPC was also investigated.In the end,influence mechanisms have been explained.After 2 hours out of the machine,HPSFRC with the optimal mix proportion has good pumpability.The experimental results show that with the increase of content of fiber used in HPC,the total areas of plastic cracking decrease and the concrete anti-cracking grade improves.For HPC in which volume fraction of steel fibers is 0.8%,the free drying shrinkage could be diminished by about 50% in 90 days and the restrained drying shrinkage cracking could be avioded thoroughly within 66 days after casting,and accordingly reduce the cracking risk of concrete,and result in higher durability in anchorage zone.The test results also show that when 0.6% volume fraction of steel fibers together 1.5% SRA(by weight of cementitious material) are added into HPC,plastic shrinkage cracking and free drying shrinkage diminished obviously at early age.Furthermore,compared with the same strength of HPC,the experimental results indicate the addition of steel fiber improves the long term mechanical properties of HPC,especially the bending strength and splitting strength improve by 30%.
The usual fiber concrete is not widely used in high bridge tower due to bad pumping performance.Experiments were concentrated on pumpability,plastic shrinkage and drying shrinkage of the anchorage concrete.Based on the advanced multi-compound technique,the fiber concrete mix design was modified to ensure good pumpability.The effect of hot weather conditions on plastic shrinkage cracking of high performance concrete(HPC) and special high performance steel fiber-reinforced concrete(HPSFRC) have been analysised by the method of artificial imitation in the lab.The effect of fiber content and shrinkage-reducing agent(SRA) on plastic shrinkage cracking and drying shrinkage of HPC was also investigated.In the end,influence mechanisms have been explained.After 2 hours out of the machine,HPSFRC with the optimal mix proportion has good pumpability.The experimental results show that with the increase of content of fiber used in HPC,the total areas of plastic cracking decrease and the concrete anti-cracking grade improves.For HPC in which volume fraction of steel fibers is 0.8%,the free drying shrinkage could be diminished by about 50% in 90 days and the restrained drying shrinkage cracking could be avioded thoroughly within 66 days after casting,and accordingly reduce the cracking risk of concrete,and result in higher durability in anchorage zone.The test results also show that when 0.6% volume fraction of steel fibers together 1.5% SRA(by weight of cementitious material) are added into HPC,plastic shrinkage cracking and free drying shrinkage diminished obviously at early age.Furthermore,compared with the same strength of HPC,the experimental results indicate the addition of steel fiber improves the long term mechanical properties of HPC,especially the bending strength and splitting strength improve by 30%.
2007, 37(1): 82-86.
doi: 10.13204/j.gyjz200701021
Abstract:
The flexural strength of steel fiber recycled concrete (SRC) with different recycled coarse aggregate(RCA) replacement ratio and different water/cement(W/C) ratios was investigated,these SRC were mixed with RCA in weight percentage of(referred to total coarse aggregate) 0%,30%,50%,70% and 100%. Firstly,the basic performances of RCA were undertaken in the interior tests,mainly including the density,Los Angeles abrasion loss and crush index,etc.,and then the flexural strength of SRC has also been undertaken.The results indicated that the flexural strength of SRC can be greatly influenced by the content of RCA and different(W/C) ratios.On condition that the design flexural strength was 6.0 MPa and the content of steel fiber was 1.0%,when the content of RCA is less than 50% and W/C ratios is from 0.44 to 0.47,the 28d flexural strength of SRC is very approaching to the plain steel fiber concrete.However,if the data were not in these ranges,the flexural strength of SRC would have a remarkable decrease.Finally,the SRC content with 30% RCA has been applied in a trial pavement section,the data of flexural strength from in-situ could have met the demand of grade I.
The flexural strength of steel fiber recycled concrete (SRC) with different recycled coarse aggregate(RCA) replacement ratio and different water/cement(W/C) ratios was investigated,these SRC were mixed with RCA in weight percentage of(referred to total coarse aggregate) 0%,30%,50%,70% and 100%. Firstly,the basic performances of RCA were undertaken in the interior tests,mainly including the density,Los Angeles abrasion loss and crush index,etc.,and then the flexural strength of SRC has also been undertaken.The results indicated that the flexural strength of SRC can be greatly influenced by the content of RCA and different(W/C) ratios.On condition that the design flexural strength was 6.0 MPa and the content of steel fiber was 1.0%,when the content of RCA is less than 50% and W/C ratios is from 0.44 to 0.47,the 28d flexural strength of SRC is very approaching to the plain steel fiber concrete.However,if the data were not in these ranges,the flexural strength of SRC would have a remarkable decrease.Finally,the SRC content with 30% RCA has been applied in a trial pavement section,the data of flexural strength from in-situ could have met the demand of grade I.
2007, 37(1): 87-92,81.
doi: 10.13204/j.gyjz200701022
Abstract:
Solid65 element is defined for concrete material specially in the ANSYS software.The research results in analysis of RC structures,steel-concrete composite structures and FRP-strengthened concrete structures by using Solid65 element are reviewed.The methods of how to use this element and some matters needing attention are summarized and two typical examples are provided.The limitations in the analysis of concrete structures by using this element and the aspects which should be further researched in the future are pointed out in the end of the paper.
Solid65 element is defined for concrete material specially in the ANSYS software.The research results in analysis of RC structures,steel-concrete composite structures and FRP-strengthened concrete structures by using Solid65 element are reviewed.The methods of how to use this element and some matters needing attention are summarized and two typical examples are provided.The limitations in the analysis of concrete structures by using this element and the aspects which should be further researched in the future are pointed out in the end of the paper.
RELIABILITY ANALYSIS OF PLANAR PRESTRESSED STEEL TRUSSES BASED UPON REFLECTION TRANSFORMATION METHOD
2007, 37(1): 93-95.
doi: 10.13204/j.gyjz200701023
Abstract:
The method of reflection transformation is used to establish the computational model of reliability index of each element of planar prestressed steel structures with elastic restraint,and reliability index of the structural system is further obtained with the method of point evalution technique.Random parameters,including areas of cross sections of all the elements,area of cables,pretension of cables,external forces and stiffness of elastic restraint are considered.Finally,some computational examples are put forward and the results are discussed.It is concluded that effect of mean square deviation of pretension of the cables,on reliability index of the structures is relevant to characteristics of distribution of random variables,and the effect of the random variables being in normal distribution is commonly less than that in logarithmic normal distribution.On the other hand, effect of mean square deviation of random variables on reliability index of the structures is also linked to relativity coefficient -(NA),which lay some fundation for reliability design of the prestressed steel structural system.
The method of reflection transformation is used to establish the computational model of reliability index of each element of planar prestressed steel structures with elastic restraint,and reliability index of the structural system is further obtained with the method of point evalution technique.Random parameters,including areas of cross sections of all the elements,area of cables,pretension of cables,external forces and stiffness of elastic restraint are considered.Finally,some computational examples are put forward and the results are discussed.It is concluded that effect of mean square deviation of pretension of the cables,on reliability index of the structures is relevant to characteristics of distribution of random variables,and the effect of the random variables being in normal distribution is commonly less than that in logarithmic normal distribution.On the other hand, effect of mean square deviation of random variables on reliability index of the structures is also linked to relativity coefficient -(NA),which lay some fundation for reliability design of the prestressed steel structural system.
2007, 37(1): 96-100.
doi: 10.13204/j.gyjz200701024
Abstract:
Based on the finite element method,the interactive buckling of tapered H-section steel beams used in portal frame structures are analyzed by ANSYS,in which geometric and material non-linearity are considered.The H-section tapered beams with thin web are dispersed by Shell 181 element and analyzed considering the geometric initial imperfection and the residual stress in the whole course.According to the load-deflection curves obtained,ultimate load-carrying capacity,deformation and the area of plasticity etc,the geometric parameters are analyzed systematically,which include web width-thickness ratio,flange width-thickness ratio,span and web tapering ratio etc.The interactive buckling of tapered H-section steel beams is discussed.By comparing the results obtained from the method with those of current Chinese technical specification,some valuable conclusions are drawn.
Based on the finite element method,the interactive buckling of tapered H-section steel beams used in portal frame structures are analyzed by ANSYS,in which geometric and material non-linearity are considered.The H-section tapered beams with thin web are dispersed by Shell 181 element and analyzed considering the geometric initial imperfection and the residual stress in the whole course.According to the load-deflection curves obtained,ultimate load-carrying capacity,deformation and the area of plasticity etc,the geometric parameters are analyzed systematically,which include web width-thickness ratio,flange width-thickness ratio,span and web tapering ratio etc.The interactive buckling of tapered H-section steel beams is discussed.By comparing the results obtained from the method with those of current Chinese technical specification,some valuable conclusions are drawn.
2007, 37(1): 101-103,76.
doi: 10.13204/j.gyjz200701025
Abstract:
The requirements for allowable stress design of masonry were retained and strength design provisions were first included in the American Building Code Requirements for Masonry Structures(ACI 530-02/ASCE 5-02/TMS 402-02) in the 2002 edition.Allowable stress and strength design method for shearing member are briefly compared and introduced.The purpose is knowing more about building code for masonry structures in the United States.This will be helpful to compile new design code for masonry and enhance development of building code of masonry structures in China.
The requirements for allowable stress design of masonry were retained and strength design provisions were first included in the American Building Code Requirements for Masonry Structures(ACI 530-02/ASCE 5-02/TMS 402-02) in the 2002 edition.Allowable stress and strength design method for shearing member are briefly compared and introduced.The purpose is knowing more about building code for masonry structures in the United States.This will be helpful to compile new design code for masonry and enhance development of building code of masonry structures in China.
2007, 37(1): 104-106.
doi: 10.13204/j.gyjz200701026
Abstract:
Experiments were done on 16 circular concrete short columns wound with thin steel cable in different interval.The forced characteristics of this type of confined concrete under axial compression is researched.The result indicates that the compressive strength and ductility of the columns are improved efficiently by the external confining steel cable.
Experiments were done on 16 circular concrete short columns wound with thin steel cable in different interval.The forced characteristics of this type of confined concrete under axial compression is researched.The result indicates that the compressive strength and ductility of the columns are improved efficiently by the external confining steel cable.
2007, 37(1): 107-109.
doi: 10.13204/j.gyjz200701027
Abstract:
A six-storey dwelling house in serious declination with 556 mm maximum drift of the roof plate due to the differential settlement of the foundation of the building has been rectified by strengthening with statically pressed bolt pile and digging through the foundation plate.The conceptual design method, the procedure of construction supervision and control,and the way to steady settlement of the foundation are recommended which may be a reference for engineering design and technology research.
A six-storey dwelling house in serious declination with 556 mm maximum drift of the roof plate due to the differential settlement of the foundation of the building has been rectified by strengthening with statically pressed bolt pile and digging through the foundation plate.The conceptual design method, the procedure of construction supervision and control,and the way to steady settlement of the foundation are recommended which may be a reference for engineering design and technology research.
2007, 37(1): 110-112.
doi: 10.13204/j.gyjz200701028
Abstract:
The detection for concrete column cracking of a dwelling building by detecting chlorine ion in the concrete,concrete cover thickness and degree of steel-bar corrosion was completed.The result of detection and analysis indicated that the main reason of column cracking was that the content of chlorine ion in concrete was higher.The distributive rules of chlorine ion in concrete column were also discussed.
The detection for concrete column cracking of a dwelling building by detecting chlorine ion in the concrete,concrete cover thickness and degree of steel-bar corrosion was completed.The result of detection and analysis indicated that the main reason of column cracking was that the content of chlorine ion in concrete was higher.The distributive rules of chlorine ion in concrete column were also discussed.
2007, 37(1): 113-114.
doi: 10.13204/j.gyjz20070130
Abstract:
For the foreign building culture,it is proposed that the doctrine of taking and copying should be adopted,namely assimilate the essence and reject the dross,at the same time when absorbing a new thing,people should remember the inheritance and drawing of the Chinese traditional culture.Only by doing so,can we form the building design theories having the Chinese special features.
For the foreign building culture,it is proposed that the doctrine of taking and copying should be adopted,namely assimilate the essence and reject the dross,at the same time when absorbing a new thing,people should remember the inheritance and drawing of the Chinese traditional culture.Only by doing so,can we form the building design theories having the Chinese special features.
2007, 37(1): 115-117.
doi: 10.13204/j.gyjz20070131
Abstract:
The city residential quarters with water landscape are developing rapidly.However,they need to be understood more completely.It is explored the role of water landscapes in urban residential quarters and the approaches of water landscapes design.Finally,the approaches are analysed by taking a practial project as example.
The city residential quarters with water landscape are developing rapidly.However,they need to be understood more completely.It is explored the role of water landscapes in urban residential quarters and the approaches of water landscapes design.Finally,the approaches are analysed by taking a practial project as example.
