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2008 Vol. 38, No. 10
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2008, 38(10): 1-3.
doi: 10.13204/j.gyjz20081001
Abstract:
By means of the introduction to the architectural design characteristics and creation ideas of the heavy machinery workshop and RD center of Beijing No.1 Machine Tool Plant,it is proposed that the issues to be concerned and faced with in the design of a modern industrial building.And it is also obtained that the importance and imminence for studying the development trend of modern industrial buildings.
By means of the introduction to the architectural design characteristics and creation ideas of the heavy machinery workshop and RD center of Beijing No.1 Machine Tool Plant,it is proposed that the issues to be concerned and faced with in the design of a modern industrial building.And it is also obtained that the importance and imminence for studying the development trend of modern industrial buildings.
2008, 38(10): 4-7,19.
doi: 10.13204/j.gyjz20081002
Abstract:
Through the renovation process of 1933 old buildings, the regeneration of the old buildings with cultural value is exhibited;and the design of a commercial buildings can be done by means of cultural ethos and values.
Through the renovation process of 1933 old buildings, the regeneration of the old buildings with cultural value is exhibited;and the design of a commercial buildings can be done by means of cultural ethos and values.
2008, 38(10): 8-10.
doi: 10.13204/j.gyjz20081003
Abstract:
Flexible modular design concept provides a good solution to the problems of design of an airport freight station construction in the process,fire protection,architecture and structure etc,which makes its building have the flexible layout,fast and effective process,aesthetic image,safe structure and fire protection for the architecture,thus adapting to the aviation needs of the development of the logistics industry.A new vitality and connotation are given to the airport freight buildings,which can improve an enterprises adaptive capacity and competitiveness.
Flexible modular design concept provides a good solution to the problems of design of an airport freight station construction in the process,fire protection,architecture and structure etc,which makes its building have the flexible layout,fast and effective process,aesthetic image,safe structure and fire protection for the architecture,thus adapting to the aviation needs of the development of the logistics industry.A new vitality and connotation are given to the airport freight buildings,which can improve an enterprises adaptive capacity and competitiveness.
2008, 38(10): 11-14.
doi: 10.13204/j.gyjz20081004
Abstract:
The newly constructed Ameco A380 hangar is for line maintenance for all types of aircrafts including A380 aircraft.This hangar is provided with multifunctional and highly flexible aircraft maintenance facilities.All designs(including process layout,equipment allocation,plan layout,building appearance,and structure systems) are based on the service for the functional demands on the hangar.This paper reveals the intrinsic laws and functional features of aircraft maintenance hangars,and further discusses what designers should consider for this type of specially functioned buildings.
The newly constructed Ameco A380 hangar is for line maintenance for all types of aircrafts including A380 aircraft.This hangar is provided with multifunctional and highly flexible aircraft maintenance facilities.All designs(including process layout,equipment allocation,plan layout,building appearance,and structure systems) are based on the service for the functional demands on the hangar.This paper reveals the intrinsic laws and functional features of aircraft maintenance hangars,and further discusses what designers should consider for this type of specially functioned buildings.
2008, 38(10): 15-19.
doi: 10.13204/j.gyjz20081005
Abstract:
It is made that a re-study and re-consideration of the nature as well as design and construction of modern industrial buildings.Based on the design of a project,it is analyzed the execution of energy conservation,ecological balance,green design and environmentally friendly concepts,and it is highlighted that the energy conservation designs and specific use of corresponding techniques for industrial buildings.
It is made that a re-study and re-consideration of the nature as well as design and construction of modern industrial buildings.Based on the design of a project,it is analyzed the execution of energy conservation,ecological balance,green design and environmentally friendly concepts,and it is highlighted that the energy conservation designs and specific use of corresponding techniques for industrial buildings.
2008, 38(10): 20-22.
doi: 10.13204/j.gyjz20081006
Abstract:
The pre-phase analysis and the succedent conjunction process are virtually necessary for every design of projects.It is probably not possible to creat outstanding designs without these two processes.However,whether the design will finally become a 'unique' one or an 'eye opening' piece of work will largely depend on the architect himself.This is a very 'subjective' factor that is non-rational,directly related to the acquirements and nature of the architect,and also,related to the design start point that is adopted during the pre-phase analysis and conjunction processes.
The pre-phase analysis and the succedent conjunction process are virtually necessary for every design of projects.It is probably not possible to creat outstanding designs without these two processes.However,whether the design will finally become a 'unique' one or an 'eye opening' piece of work will largely depend on the architect himself.This is a very 'subjective' factor that is non-rational,directly related to the acquirements and nature of the architect,and also,related to the design start point that is adopted during the pre-phase analysis and conjunction processes.
2008, 38(10): 23-25.
doi: 10.13204/j.gyjz20081007
Abstract:
A good industrial building is not only with reasonable process flow,but also concerns a lot for its users on aspects of space,color and environment.The design of the production complex building of National Sports Lottery Printing Co., Ltd in Beijing does well in this respect.The building,as headquarters of the enterprise,will also be a landmark of the region.The design will lead people to a new understanding of industrial buildings.
A good industrial building is not only with reasonable process flow,but also concerns a lot for its users on aspects of space,color and environment.The design of the production complex building of National Sports Lottery Printing Co., Ltd in Beijing does well in this respect.The building,as headquarters of the enterprise,will also be a landmark of the region.The design will lead people to a new understanding of industrial buildings.
2008, 38(10): 26-29.
doi: 10.13204/j.gyjz20081008
Abstract:
It is discussed the scientific and rational research/analysis method that is based on rational analyses of existing conditions,acquisition of rational concepts and rational expressions of planning schemes.It is also attempted to create a functionally reasonable and featured design,which is also adapted to typical Chinese philosophy.
It is discussed the scientific and rational research/analysis method that is based on rational analyses of existing conditions,acquisition of rational concepts and rational expressions of planning schemes.It is also attempted to create a functionally reasonable and featured design,which is also adapted to typical Chinese philosophy.
2008, 38(10): 30-32.
doi: 10.13204/j.gyjz20081009
Abstract:
Lead has a good deformability.Based on the properties of this deformability and recovering without strain-hardening,a rod-like lead shear damper,which is installed at the end(plastic hinge)of a beam for a framed joint,is presented, and it is primarily used in the dissipation of earthquake energy.Based on the finite element method(FEM) analytical results,it is found that this type of damper can effectively increase the damping ratio of a beam during a earthquake,and the performance is stable.
Lead has a good deformability.Based on the properties of this deformability and recovering without strain-hardening,a rod-like lead shear damper,which is installed at the end(plastic hinge)of a beam for a framed joint,is presented, and it is primarily used in the dissipation of earthquake energy.Based on the finite element method(FEM) analytical results,it is found that this type of damper can effectively increase the damping ratio of a beam during a earthquake,and the performance is stable.
2008, 38(10): 33-37.
doi: 10.13204/j.gyjz20081010
Abstract:
Ultra-short columns will endure more lateral load because of their large stiffness compared to general columns in an earthquake.The deformation behavior and ductility of extremely short columns are poor due to the shear failure,which decreases the seismic performance of the concrete structure.The seismic performance of four ultra-short columns(two reinforced concrete ultra-short columns and two steel reinforced concrete ultra-short columns) are studied in this paper.The rational suggestions on design are proposed according to the current codes both at home and abroad.
Ultra-short columns will endure more lateral load because of their large stiffness compared to general columns in an earthquake.The deformation behavior and ductility of extremely short columns are poor due to the shear failure,which decreases the seismic performance of the concrete structure.The seismic performance of four ultra-short columns(two reinforced concrete ultra-short columns and two steel reinforced concrete ultra-short columns) are studied in this paper.The rational suggestions on design are proposed according to the current codes both at home and abroad.
2008, 38(10): 38-41.
doi: 10.13204/j.gyjz20081011
Abstract:
Developing the safe,economical and practical anchorage system is the foundation of applying the structure prestressed by the FRP tendons.On the basis of the tension and anchorage equipments of prestressed structures inland,it has been carried out that the experimental studies on such four FRP tendon anchorage systems as sleeve-glue pattern,wedged jaw pattern with burned-on-sand,extruded pattern with glue and wedged jaw pattern with sleeve.According to our research results,the following conclusions are drawn.When the length of sleeve is more than 200mm,the sleeve-glue pattern anchorage system will meet the anchorage needs.The anchorage performances of the systems of the wedged jaw pattern with burned-on-sand and the extruded pattern with glue are unsteady.The wedged jaw pattern system with sleeve is satisfactory when the surface of the FRP tendon has been pretreated.
Developing the safe,economical and practical anchorage system is the foundation of applying the structure prestressed by the FRP tendons.On the basis of the tension and anchorage equipments of prestressed structures inland,it has been carried out that the experimental studies on such four FRP tendon anchorage systems as sleeve-glue pattern,wedged jaw pattern with burned-on-sand,extruded pattern with glue and wedged jaw pattern with sleeve.According to our research results,the following conclusions are drawn.When the length of sleeve is more than 200mm,the sleeve-glue pattern anchorage system will meet the anchorage needs.The anchorage performances of the systems of the wedged jaw pattern with burned-on-sand and the extruded pattern with glue are unsteady.The wedged jaw pattern system with sleeve is satisfactory when the surface of the FRP tendon has been pretreated.
2008, 38(10): 42-47.
doi: 10.13204/j.gyjz20081012
Abstract:
The arch transfer floor may be a new type of transfer story structure. As a result of the sudden change of rigidity of superstructure and substructure,the earthquake response may be considerably sharp.The effect of the equivalent lateral rigidity ratio on frequent earthquake response is analyzed in this new transfer floor,and some design proposals are presented,which can be referred in the design of engineering.
The arch transfer floor may be a new type of transfer story structure. As a result of the sudden change of rigidity of superstructure and substructure,the earthquake response may be considerably sharp.The effect of the equivalent lateral rigidity ratio on frequent earthquake response is analyzed in this new transfer floor,and some design proposals are presented,which can be referred in the design of engineering.
2008, 38(10): 48-52.
doi: 10.13204/j.gyjz20081013
Abstract:
The traditional tenon connection of precast monolithic R.C.frame columns is improved.In which the concrete-filled steel tubular tenon instead of the R.C.tenon and the longitudinal steel bars connected by rolled parallel thread sleeve instead of welding or sleeve-cold-extruding connection technologies.The test results of 6 frame column specimens subjected to low-cycle reversed horizontal load and the test results of construction technologies show that the suggested tenon connection of frame columns is reliable and convenient,and it can be used in the practical engineering.Some suggestions on design and construction are also proposed.
The traditional tenon connection of precast monolithic R.C.frame columns is improved.In which the concrete-filled steel tubular tenon instead of the R.C.tenon and the longitudinal steel bars connected by rolled parallel thread sleeve instead of welding or sleeve-cold-extruding connection technologies.The test results of 6 frame column specimens subjected to low-cycle reversed horizontal load and the test results of construction technologies show that the suggested tenon connection of frame columns is reliable and convenient,and it can be used in the practical engineering.Some suggestions on design and construction are also proposed.
2008, 38(10): 53-56.
doi: 10.13204/j.gyjz20081014
Abstract:
Numerical analysis was executed to study the in-plane stability capacity of extruded aluminium alloy beam-columns of single symmetric sections,and a modified coefficient _2 in the interaction expression was calculated by parameter analysis.Based on above analysis,_2 was proposed to be 1.15 for weak hardening alloy and 1.25 for strong hardening alloy,which have been verified by comparison with numerical calculation results.
Numerical analysis was executed to study the in-plane stability capacity of extruded aluminium alloy beam-columns of single symmetric sections,and a modified coefficient _2 in the interaction expression was calculated by parameter analysis.Based on above analysis,_2 was proposed to be 1.15 for weak hardening alloy and 1.25 for strong hardening alloy,which have been verified by comparison with numerical calculation results.
2008, 38(10): 57-60.
doi: 10.13204/j.gyjz20081015
Abstract:
It was discussed the method of the estimation on essential nature vibration period of reinforced concrete frame structure of high-rise construction,and was established the formulas having simpler calculation and lesser average discrepancy between actual value and the estimated one.
It was discussed the method of the estimation on essential nature vibration period of reinforced concrete frame structure of high-rise construction,and was established the formulas having simpler calculation and lesser average discrepancy between actual value and the estimated one.
2008, 38(10): 61-64.
doi: 10.13204/j.gyjz20081016
Abstract:
Two typical swamp soils in Sanjiang Plain,Northeast China are studied through physical,mechanical and microstructure tests.Another wetland soil in Cuihu,Beijing is used to compare with the swamp soil.Test results show that moisture content,liquidity index,void ratio,void volume,void number and consolidation deformation of the black swamp soil are far more than that of the white swamp soil and the wetland soil.The shear strength of the black swamp soil is the least among three soils that are all less than 0.5 kPa of the c values.The properties of the white swamp soil are near to that of the wetland soil.But the indexes of the black swamp soil are very special.Study results in this paper enrich present research findings of soft soil,which can provide references for engineering construction in swamp regions.
Two typical swamp soils in Sanjiang Plain,Northeast China are studied through physical,mechanical and microstructure tests.Another wetland soil in Cuihu,Beijing is used to compare with the swamp soil.Test results show that moisture content,liquidity index,void ratio,void volume,void number and consolidation deformation of the black swamp soil are far more than that of the white swamp soil and the wetland soil.The shear strength of the black swamp soil is the least among three soils that are all less than 0.5 kPa of the c values.The properties of the white swamp soil are near to that of the wetland soil.But the indexes of the black swamp soil are very special.Study results in this paper enrich present research findings of soft soil,which can provide references for engineering construction in swamp regions.
2008, 38(10): 65-70.
doi: 10.13204/j.gyjz20081017
Abstract:
Based on the analysis of the displacement field of buried pipeline between the two deep excavation,the effect factors on buried pipeline during excavation of two adjacent foundation are simulated and analyzed using 3D FEM.Several factors such as buried depth,distance from two adjacent excavations,pipeline materials,substratum,the ratio of the elastic modulus of pipeline to adjacent soil,etc.are analyzed primarily,and their influences on pipeline are checked by the horizontal and vertical displacement.Some valuable conclusions for construction practice are drawn.
Based on the analysis of the displacement field of buried pipeline between the two deep excavation,the effect factors on buried pipeline during excavation of two adjacent foundation are simulated and analyzed using 3D FEM.Several factors such as buried depth,distance from two adjacent excavations,pipeline materials,substratum,the ratio of the elastic modulus of pipeline to adjacent soil,etc.are analyzed primarily,and their influences on pipeline are checked by the horizontal and vertical displacement.Some valuable conclusions for construction practice are drawn.
2008, 38(10): 71-75.
doi: 10.13204/j.gyjz20081018
Abstract:
A new type umbrella-shaped anti-float device is designed and manufactured to perfect the traditional anchors and the model test is adopted to analyze the pull capacity.There are two groups of pull-out tests for umbrella-shaped anchor with and without grouting at anchor head.And a group of vertical pile drawing tests is done.The results indicate that the anti-float performance of the new type anchors is superior to that of over traditional vertical piles.Moreover,umbrella-shaped anchor with grouting at anchor head is better.And the reliability of the results is proved through finite element analysis.According to the mechanical analysis of the umbrella-shaped anchor,it is pointed out that the bearing capacity depends on the weight of soil pole wrapped by the anchor head and the shear strength along the interface of soil pole.Therefore the ultimate bearing capacity estimation formula of the umbrella-shaped anchor can be presented,which establishes the foundation for the engineering application of umbrella-shaped anchors.
A new type umbrella-shaped anti-float device is designed and manufactured to perfect the traditional anchors and the model test is adopted to analyze the pull capacity.There are two groups of pull-out tests for umbrella-shaped anchor with and without grouting at anchor head.And a group of vertical pile drawing tests is done.The results indicate that the anti-float performance of the new type anchors is superior to that of over traditional vertical piles.Moreover,umbrella-shaped anchor with grouting at anchor head is better.And the reliability of the results is proved through finite element analysis.According to the mechanical analysis of the umbrella-shaped anchor,it is pointed out that the bearing capacity depends on the weight of soil pole wrapped by the anchor head and the shear strength along the interface of soil pole.Therefore the ultimate bearing capacity estimation formula of the umbrella-shaped anchor can be presented,which establishes the foundation for the engineering application of umbrella-shaped anchors.
2008, 38(10): 76-79.
doi: 10.13204/j.gyjz20081019
Abstract:
Based on FEM analysis,the deformation of bedding rock slope with single free face or double free face is studied.More attention is paid to the influcence of angle between strike of slope and strata on slope stability and the index regarding the strike angle used to distinguish between bedding rock slope and non-bedding rock slope is developed.Furthermore,the FEM results related to the case of single free face are verified by the model test.All the results show that referring to bedding rock slope with single free face and with double free face,when the angle between strike of slope and strata is more than 30 and 50 respectively,the slope may not be regarded as bedding rock slope any more.
Based on FEM analysis,the deformation of bedding rock slope with single free face or double free face is studied.More attention is paid to the influcence of angle between strike of slope and strata on slope stability and the index regarding the strike angle used to distinguish between bedding rock slope and non-bedding rock slope is developed.Furthermore,the FEM results related to the case of single free face are verified by the model test.All the results show that referring to bedding rock slope with single free face and with double free face,when the angle between strike of slope and strata is more than 30 and 50 respectively,the slope may not be regarded as bedding rock slope any more.
2008, 38(10): 80-84.
doi: 10.13204/j.gyjz20081020
Abstract:
The long-term mechanical properties of recycled aggregate concrete(RAC) are of great importance for insuring the construction quality and safety of buildings made with this material.For this reason,the development of mechanical properties of RAC of different strength grades over time was extensively investigated,mainly including the compressive strength,the tensile splitting strength,the flexural strength and the modulus of elasticity.The changing law of the long-term mechanical properties of RAC was analyzed and the adaptability of the predict method for the long-term mechanical properties of conventional concrete to RAC was evaluated.The test results indicated that the developments of the mechanical properties of RAC over time are different from that of conventional concrete.Higher strength and modulus of elasticity gain were observed for RAC.The predict methods for the long-term mechanical properties of conventional concrete are not suitable for RAC.Based on the test results in this paper,alternative predicting methods for the long-term mechanical properties of were proposed.
The long-term mechanical properties of recycled aggregate concrete(RAC) are of great importance for insuring the construction quality and safety of buildings made with this material.For this reason,the development of mechanical properties of RAC of different strength grades over time was extensively investigated,mainly including the compressive strength,the tensile splitting strength,the flexural strength and the modulus of elasticity.The changing law of the long-term mechanical properties of RAC was analyzed and the adaptability of the predict method for the long-term mechanical properties of conventional concrete to RAC was evaluated.The test results indicated that the developments of the mechanical properties of RAC over time are different from that of conventional concrete.Higher strength and modulus of elasticity gain were observed for RAC.The predict methods for the long-term mechanical properties of conventional concrete are not suitable for RAC.Based on the test results in this paper,alternative predicting methods for the long-term mechanical properties of were proposed.
2008, 38(10): 85-89.
doi: 10.13204/j.gyjz20081021
Abstract:
It is studied that the effects on anti-permeability,frost resistance,durability and dry shrinkage deformation of concrete by adding different volume percentage contents of carbon fibre,different content and fineness of granulated slag.The results show that ultrafine slag and carbon fibre can improve the anti-permeability and frost resistance of concrete within a fixed content range,under the same ratio of slag and ash,anti-permeability can be improved gradually with the increased fineness of slag,the dry shrinkage value of slag-carbon fibre multiphase electric conduction concrete is slightly larger than that of an ordinary concrete.
It is studied that the effects on anti-permeability,frost resistance,durability and dry shrinkage deformation of concrete by adding different volume percentage contents of carbon fibre,different content and fineness of granulated slag.The results show that ultrafine slag and carbon fibre can improve the anti-permeability and frost resistance of concrete within a fixed content range,under the same ratio of slag and ash,anti-permeability can be improved gradually with the increased fineness of slag,the dry shrinkage value of slag-carbon fibre multiphase electric conduction concrete is slightly larger than that of an ordinary concrete.
2008, 38(10): 90-93.
doi: 10.13204/j.gyjz20081022
Abstract:
This paper get C30 and C50 self-compacting concrete according to the manual of SCC desgn and construction.The experimental research on mechanics performance included the cubic compression strength experiment,the prismy compression strength and the splitting strength experiment.Through the analysis of experimental result the cubic compression strength,the prismy compression strength,the splitting strength,elastic module,peak strain,utmost strain and poisson ratio are obtained,and the formula of stress-strain curves is proposed.These mechanics performance conclusions will provide references for establishing related regulations of SCC structure.
This paper get C30 and C50 self-compacting concrete according to the manual of SCC desgn and construction.The experimental research on mechanics performance included the cubic compression strength experiment,the prismy compression strength and the splitting strength experiment.Through the analysis of experimental result the cubic compression strength,the prismy compression strength,the splitting strength,elastic module,peak strain,utmost strain and poisson ratio are obtained,and the formula of stress-strain curves is proposed.These mechanics performance conclusions will provide references for establishing related regulations of SCC structure.
2008, 38(10): 94-98.
doi: 10.13204/j.gyjz20081023
Abstract:
At present,there has been an increase in the use of the technology of concrete structures strengthened with carbon fibre reinforced polymer(CFRP).However,because the glass transition temperature(T_g) of the organic matrix/adhesive is only about 100C,the CFRP-concrete bond strength will be severely degraded in fire,and then the effective of the CFRP strengthening systems will be lost.Therefore,it is very important to study the fire performance of CFRP strengthened reinforced concrete structures.By sorting out and analyzing the relative research results at home and abroad,this paper reviews present research situation of the fire behavior of CFRP and CFRP strengthened reinforced concrete structures,and presents the prospect of future research in this field to provide references for further study.
At present,there has been an increase in the use of the technology of concrete structures strengthened with carbon fibre reinforced polymer(CFRP).However,because the glass transition temperature(T_g) of the organic matrix/adhesive is only about 100C,the CFRP-concrete bond strength will be severely degraded in fire,and then the effective of the CFRP strengthening systems will be lost.Therefore,it is very important to study the fire performance of CFRP strengthened reinforced concrete structures.By sorting out and analyzing the relative research results at home and abroad,this paper reviews present research situation of the fire behavior of CFRP and CFRP strengthened reinforced concrete structures,and presents the prospect of future research in this field to provide references for further study.
2008, 38(10): 99-101.
doi: 10.13204/j.gyjz20081024
Abstract:
This paper presents results from a wind tunnel study of wind pressures on an extra-long-span roof structure.In this study,mean,root-mean-square and peak wind pressure coefficient distributions on the roof are presented and discussed.The result presents maximum mean and peak pressure coefficient at corner of the roof.Major intermittent wind energy distribution is presented when the 3-D power spectrum density(PSD) of some typical measuring points on the roof is discussed.
This paper presents results from a wind tunnel study of wind pressures on an extra-long-span roof structure.In this study,mean,root-mean-square and peak wind pressure coefficient distributions on the roof are presented and discussed.The result presents maximum mean and peak pressure coefficient at corner of the roof.Major intermittent wind energy distribution is presented when the 3-D power spectrum density(PSD) of some typical measuring points on the roof is discussed.
2008, 38(10): 102-107.
doi: 10.13204/j.gyjz20081025
Abstract:
A theoretical study is carried out on the current design approach of encased steel column bases.The load transfer within encased bases must be analyzed.Because of the studs,part of the axial load is transferred from steel to exterior concrete.An analytical solution is presented for the axial load in the concrete.Through calculated examples it is found that the axial force in the concrete is 20%～30% of the total axial force of the column at the bottommost base.The design of the encased steel column bases requires the bending moment being transferred to exterior reinforced concrete fully at the bottom,In this situation it is found that the shear force in the cross-section of steel is reverse to the external shear force of the column,therefore the shear force carried by the exterior concrete is even greater that the external shear force.According to this phenomenon,a new design against the shear force is proposed.Finally a detailed design procedure is proposed.
A theoretical study is carried out on the current design approach of encased steel column bases.The load transfer within encased bases must be analyzed.Because of the studs,part of the axial load is transferred from steel to exterior concrete.An analytical solution is presented for the axial load in the concrete.Through calculated examples it is found that the axial force in the concrete is 20%～30% of the total axial force of the column at the bottommost base.The design of the encased steel column bases requires the bending moment being transferred to exterior reinforced concrete fully at the bottom,In this situation it is found that the shear force in the cross-section of steel is reverse to the external shear force of the column,therefore the shear force carried by the exterior concrete is even greater that the external shear force.According to this phenomenon,a new design against the shear force is proposed.Finally a detailed design procedure is proposed.
2008, 38(10): 108-111.
doi: 10.13204/j.gyjz20081026
Abstract:
It is researched that the forced features of the joints of the multi-story spanned diagonal bracing system for Chengda Tower in Chengdu.Based on the results of overall structural analysis under various load cases,sectional forces in members,beams,columns and adjacent braces,relating to a certain joint are recorded. Typical joints are then modeled in details for the stress analysis using shell elements.According to the finite element analysis,several measures for joint design are proposed.Subsequent FE analysis indicates that strengthening techniques proposed in this study are feasible and efficient.
It is researched that the forced features of the joints of the multi-story spanned diagonal bracing system for Chengda Tower in Chengdu.Based on the results of overall structural analysis under various load cases,sectional forces in members,beams,columns and adjacent braces,relating to a certain joint are recorded. Typical joints are then modeled in details for the stress analysis using shell elements.According to the finite element analysis,several measures for joint design are proposed.Subsequent FE analysis indicates that strengthening techniques proposed in this study are feasible and efficient.
2008, 38(10): 112-114.
doi: 10.13204/j.gyjz20081027
Abstract:
Experimental study for a set of endplate-connections of rectangular hollow steel columns and I-type beams which are widely used in engineering are put forward.The practical situation that the circular opening is set at one side of the rectangular hollow steel column are considered for the tests.The openings are usually called hand-opening which are for convience of the bolts being installed.Through the experiments,the stiffness of connections and its variation,bearing capacity of moment of the connection and the curves of moment-rotation are all obtained,which can be used as basis of practical design of the connections.The experimental results show that the rotational stiffness of the endplate connections greatly vary for different constructional parameters of the joints,which tell us the important facts that all the endplate connections are considered as rigid connections in practical design is not proper.
Experimental study for a set of endplate-connections of rectangular hollow steel columns and I-type beams which are widely used in engineering are put forward.The practical situation that the circular opening is set at one side of the rectangular hollow steel column are considered for the tests.The openings are usually called hand-opening which are for convience of the bolts being installed.Through the experiments,the stiffness of connections and its variation,bearing capacity of moment of the connection and the curves of moment-rotation are all obtained,which can be used as basis of practical design of the connections.The experimental results show that the rotational stiffness of the endplate connections greatly vary for different constructional parameters of the joints,which tell us the important facts that all the endplate connections are considered as rigid connections in practical design is not proper.
2008, 38(10): 115-117.
doi: 10.13204/j.gyjz20081028
Abstract:
The project is about the modification engineering of a frame-shear wall building with twelve floors.Because of the construction,the strength of concrete is only C15(design strength is C30).Several treatments are applied to the structural strengthening,including adding shear walls to decrease axial compression ratio,strengthening of beams with CFRP and haunched beam ends.The results will supply some good references for strengthening design of similar peojects.
The project is about the modification engineering of a frame-shear wall building with twelve floors.Because of the construction,the strength of concrete is only C15(design strength is C30).Several treatments are applied to the structural strengthening,including adding shear walls to decrease axial compression ratio,strengthening of beams with CFRP and haunched beam ends.The results will supply some good references for strengthening design of similar peojects.
2008, 38(10): 118-120.
doi: 10.13204/j.gyjz20081029
Abstract:
As the construction of steel structure of Guangzhou Opera House is very special,the builders adopt a 250t track hoister walking on the concrete floor to cooperate with tower cranes in hoisting and installation.So the concrete floor has to be reinforced.ANSYS is used to calculate the reinforced floor,whose results are contrasted with the site test data.The result of experiment is in accordance with the theoretical prediction.The method of analyzing reinforced floor is effective and will be worthful for construction.
As the construction of steel structure of Guangzhou Opera House is very special,the builders adopt a 250t track hoister walking on the concrete floor to cooperate with tower cranes in hoisting and installation.So the concrete floor has to be reinforced.ANSYS is used to calculate the reinforced floor,whose results are contrasted with the site test data.The result of experiment is in accordance with the theoretical prediction.The method of analyzing reinforced floor is effective and will be worthful for construction.
THE SUGGESTIONS ON COMPUTING CRITICAL REINFORCEMENT RATIO FOR CONCRETE BEAM REINFORCED WITH FRP BARS
2008, 38(10): 121-122.
doi: 10.13204/j.gyjz20081030
Abstract:
Based on the definition of two failure modes of concrete beam reinforced with FRP bars,the suggestions on computing critical reinforcement ratio for concrete beam reinforced with FRP bars and that of concrete beam reinforced with prestressed FRP bars are presented,which may be use for reference to further study and design.
Based on the definition of two failure modes of concrete beam reinforced with FRP bars,the suggestions on computing critical reinforcement ratio for concrete beam reinforced with FRP bars and that of concrete beam reinforced with prestressed FRP bars are presented,which may be use for reference to further study and design.
