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2008 Vol. 38, No. 6
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2008, 38(6): 1-2,47.
doi: 10.13204/j.gyjz200806001
Abstract:
The design of life cycle energy-saving architecture is a kind of measure and working process of energy-saving buildings for the standardization of design procedures and quantification of optimal plans.According to design conception of life cycle for an architecture and based on the theory of niche,by integrating its rules of energy-saving design and the plans for standard workshops,the design techniques and plans will be raised in considering the functional applications,the advanced techniques and its environmental harmony.
The design of life cycle energy-saving architecture is a kind of measure and working process of energy-saving buildings for the standardization of design procedures and quantification of optimal plans.According to design conception of life cycle for an architecture and based on the theory of niche,by integrating its rules of energy-saving design and the plans for standard workshops,the design techniques and plans will be raised in considering the functional applications,the advanced techniques and its environmental harmony.
2008, 38(6): 3-5.
doi: 10.13204/j.gyjz200806002
Abstract:
The basic status of climatic design of residential pitched roof in the area of being hot in summer and cold in winter is analyzed.A pitched roof system of ventilation in summer as well as heat preservation in winter is proposed in the light of the passive solar energy principle.The test data indicate that this design method is effective on improving the thermal environment of pitched roof and can reduce the usage of non-renewable resource.
The basic status of climatic design of residential pitched roof in the area of being hot in summer and cold in winter is analyzed.A pitched roof system of ventilation in summer as well as heat preservation in winter is proposed in the light of the passive solar energy principle.The test data indicate that this design method is effective on improving the thermal environment of pitched roof and can reduce the usage of non-renewable resource.
2008, 38(6): 6-8.
doi: 10.13204/j.gyjz200806003
Abstract:
In order to overconce the buildings exterior wall insulations defects such as energy-saving structure is not precise,energy-saving rate is low and easy shedding cracking,the methods of case studies,data analysis and theoretical interpretation are used to identify the crux of the problem: the energy-saving design is confined to solid thermal conductivity;although the release is noted in crack control mechanism,yet still resistance mainly;the thermal bridge treatment is not completely,and so on.A number of energy-saving improvements on the construction of the external walls is proposed: To development of radiation-based energy-saving heat exchanger that can restrict heat radiation;giving full play to air cavity in the winter insulation performance and the summer thermal exchange and flow characteristics;setting up small seam of deformation,creating release in crack control mechanism;thermal bridge treatment should be perfected,and attention should be paid to the improvement on connectors material and so on.The exterior energy-saving structure still need further improvements;bold innovations and care are necessary.
In order to overconce the buildings exterior wall insulations defects such as energy-saving structure is not precise,energy-saving rate is low and easy shedding cracking,the methods of case studies,data analysis and theoretical interpretation are used to identify the crux of the problem: the energy-saving design is confined to solid thermal conductivity;although the release is noted in crack control mechanism,yet still resistance mainly;the thermal bridge treatment is not completely,and so on.A number of energy-saving improvements on the construction of the external walls is proposed: To development of radiation-based energy-saving heat exchanger that can restrict heat radiation;giving full play to air cavity in the winter insulation performance and the summer thermal exchange and flow characteristics;setting up small seam of deformation,creating release in crack control mechanism;thermal bridge treatment should be perfected,and attention should be paid to the improvement on connectors material and so on.The exterior energy-saving structure still need further improvements;bold innovations and care are necessary.
2008, 38(6): 9-11,101.
doi: 10.13204/j.gyjz200806004
Abstract:
Starting from the domestic and international building energy-saving trend and the present development,a representative public building is selecteda hospital for investigation and audit,then audited actually the hospital building energy consumption.Based on the result of the investigation,it is analyzed the composition and features of the hospital building energy consumption,and the reason of high energy consumption.According to the hospital located and itself characteristics,combining the thought of comprehensive building energy-saving,reformcontents of building energy-saving,process,and the cost control etc,it is also put forward the energy-saving measures to attain the purpose of energy-saving,which provides theoretic method and measures for similar large buildings.
Starting from the domestic and international building energy-saving trend and the present development,a representative public building is selecteda hospital for investigation and audit,then audited actually the hospital building energy consumption.Based on the result of the investigation,it is analyzed the composition and features of the hospital building energy consumption,and the reason of high energy consumption.According to the hospital located and itself characteristics,combining the thought of comprehensive building energy-saving,reformcontents of building energy-saving,process,and the cost control etc,it is also put forward the energy-saving measures to attain the purpose of energy-saving,which provides theoretic method and measures for similar large buildings.
2008, 38(6): 12-15.
doi: 10.13204/j.gyjz200806005
Abstract:
Through discussion on the form of using solar photo-voltaics in building energy-saving,as well as the analysis of typical examples,it is pointed out that the environmental protection effect of using solar energy technology in buildings, and the important role in mitigating energy tension,energy-saving and emission reduction.The integration of giant building industry with photovoltaic generation has a bright future.
Through discussion on the form of using solar photo-voltaics in building energy-saving,as well as the analysis of typical examples,it is pointed out that the environmental protection effect of using solar energy technology in buildings, and the important role in mitigating energy tension,energy-saving and emission reduction.The integration of giant building industry with photovoltaic generation has a bright future.
2008, 38(6): 16-19.
doi: 10.13204/j.gyjz200806006
Abstract:
Through bringing in the concept of architecture surface modulus and by analyzing the cause of urban heat island effect,it is enunciated the influence brought by architecture surface absorbing the radiation which causes and enhances the urban heat island effect.Then it is analysed the relationship between architecture energy-saving and the urban heat island effect nowadays,and it is put forward some technical strategies on reducing the urban heat island effect based on ecological architecture surface.
Through bringing in the concept of architecture surface modulus and by analyzing the cause of urban heat island effect,it is enunciated the influence brought by architecture surface absorbing the radiation which causes and enhances the urban heat island effect.Then it is analysed the relationship between architecture energy-saving and the urban heat island effect nowadays,and it is put forward some technical strategies on reducing the urban heat island effect based on ecological architecture surface.
2008, 38(6): 20-22,26.
doi: 10.13204/j.gyjz200806007
Abstract:
The policy of small and medium houses with 90 m2 and adhere to the scientific development and build a harmonious society is of great significance to the design of residential buildings in China.Making solar energy and other related systems use widely in houses with 90 m2,is the requirements of this contest,which is a valuable subject of studying current design of residential buildings.It is introduced the uses of solar energy technology and other energy-saving technology in houses with 90 m2 of multi-story buildings.
The policy of small and medium houses with 90 m2 and adhere to the scientific development and build a harmonious society is of great significance to the design of residential buildings in China.Making solar energy and other related systems use widely in houses with 90 m2,is the requirements of this contest,which is a valuable subject of studying current design of residential buildings.It is introduced the uses of solar energy technology and other energy-saving technology in houses with 90 m2 of multi-story buildings.
2008, 38(6): 23-26.
doi: 10.13204/j.gyjz200806008
Abstract:
According to the features of building elimate in Hunan,it is discussed that the design main points of energy-saving windows from rational choice of a window form as well as heat insulation and airtightness of windows to the area ratio of window and wall,and also the use of solar energy etc.
According to the features of building elimate in Hunan,it is discussed that the design main points of energy-saving windows from rational choice of a window form as well as heat insulation and airtightness of windows to the area ratio of window and wall,and also the use of solar energy etc.
2008, 38(6): 27-29.
doi: 10.13204/j.gyjz200806009
Abstract:
It is introduced that the fundamental conterits and the features of the third stage standard for energy efficiency of residential buildings in Hebei Province.Which is compared with the second stage standard,with the aim of revealing the essence of the new standard,and then making it be used more exactly and widely for the energy-saving design of new residential buildings.
It is introduced that the fundamental conterits and the features of the third stage standard for energy efficiency of residential buildings in Hebei Province.Which is compared with the second stage standard,with the aim of revealing the essence of the new standard,and then making it be used more exactly and widely for the energy-saving design of new residential buildings.
SEISMIC BEHAVIOR EXPERIMENT AND DAMAGE ANALYSIS ON RC L-SHAPED COLUMNS SUBJECTED TO CYCLICAL LOADING
2008, 38(6): 30-34,57.
doi: 10.13204/j.gyjz200806010
Abstract:
Anti-seismic behavior and damage analysis of L-shaped section cross column are investigated based on 3 groups of 6 specimens subjected to cyclic loading.The include mechanical performances such as bearing capacity, failure pattern,hysteretic property,declining stiffness etc,are analyzed by the experiments.Research results indicate anti-seismic calculations of the columns should be according to direction of engineering axial and degree 45.
Anti-seismic behavior and damage analysis of L-shaped section cross column are investigated based on 3 groups of 6 specimens subjected to cyclic loading.The include mechanical performances such as bearing capacity, failure pattern,hysteretic property,declining stiffness etc,are analyzed by the experiments.Research results indicate anti-seismic calculations of the columns should be according to direction of engineering axial and degree 45.
2008, 38(6): 35-70.
doi: 10.13204/j.gyjz200806011
Abstract:
Based on the characteristics that the rigidity of the upper masonry structure is much bigger than the rigidity of laminated rubber bearings and frame structure.It can be referred to as system having a two degree of freedom.The dynamic behavior of this building is analyzed,the isolated vibration mode controls the response of system.The influence regulations among the composite damping ratio,the stiffness ratio and the mass ratio are investigated.A practical method for dynamical behavior analysis to masonry building with frame structure in the first storey with laminated rubber bearings between the first and second storey is presented,which submits efficient path to found applicable design means and to generalize interlayer seismic isolation structure.
Based on the characteristics that the rigidity of the upper masonry structure is much bigger than the rigidity of laminated rubber bearings and frame structure.It can be referred to as system having a two degree of freedom.The dynamic behavior of this building is analyzed,the isolated vibration mode controls the response of system.The influence regulations among the composite damping ratio,the stiffness ratio and the mass ratio are investigated.A practical method for dynamical behavior analysis to masonry building with frame structure in the first storey with laminated rubber bearings between the first and second storey is presented,which submits efficient path to found applicable design means and to generalize interlayer seismic isolation structure.
2008, 38(6): 38-42.
doi: 10.13204/j.gyjz200806012
Abstract:
The principle and procedure of 3D pushover analysis with N2 method are studied,Then,3D pushover analysis is performed for a 12-story reinforced concrete asymmetric frame structure,whose result is evaluated by the elastic-plastic time history analysis.The comparative result shows that the N2 method with reversed-triangle and simplified modal lateral load pattern can predict the more rationally maximal interstory drift,and that the pushover's result underestimates the elastic-plastic interstory torsion rotations.
The principle and procedure of 3D pushover analysis with N2 method are studied,Then,3D pushover analysis is performed for a 12-story reinforced concrete asymmetric frame structure,whose result is evaluated by the elastic-plastic time history analysis.The comparative result shows that the N2 method with reversed-triangle and simplified modal lateral load pattern can predict the more rationally maximal interstory drift,and that the pushover's result underestimates the elastic-plastic interstory torsion rotations.
2008, 38(6): 43-47.
doi: 10.13204/j.gyjz200806013
Abstract:
Open-spandrel rigid arch bridge is a new type of beam-arch composite structure system,and this new structure has been used in Minjiang River in Fuzhou.In order to investigate the structural behaviors of the open spandrel rigid arch,the tests of plexiglass model with geometrical similarity under varied loading are carried out.
Open-spandrel rigid arch bridge is a new type of beam-arch composite structure system,and this new structure has been used in Minjiang River in Fuzhou.In order to investigate the structural behaviors of the open spandrel rigid arch,the tests of plexiglass model with geometrical similarity under varied loading are carried out.
2008, 38(6): 48-53.
doi: 10.13204/j.gyjz200806014
Abstract:
Based on the triaxial test results of soft soil and the neural network technology,the BP model of soft soil in different stress paths and the creep BP model of soft soil are set up.The reliability of the models is validated by the data of other tests.It shows that neural network model is an effective way to set up constitutive model of soils.Through the contrast training and forecasting,some useful conclusions could be drawn.Neural network model is most suitable for interpolation forecasting,and it can be used as a supplementary way for deformation test of soft soil.In addition,the magnitude and reliability of the training samples are important impacts on model precision.
Based on the triaxial test results of soft soil and the neural network technology,the BP model of soft soil in different stress paths and the creep BP model of soft soil are set up.The reliability of the models is validated by the data of other tests.It shows that neural network model is an effective way to set up constitutive model of soils.Through the contrast training and forecasting,some useful conclusions could be drawn.Neural network model is most suitable for interpolation forecasting,and it can be used as a supplementary way for deformation test of soft soil.In addition,the magnitude and reliability of the training samples are important impacts on model precision.
2008, 38(6): 54-57.
doi: 10.13204/j.gyjz200806015
Abstract:
The time effect process of bearing capacity of preformed pile is an important and unsolved geotechnical subject.Based on the initial increasing rate and the maximum increment of bearing capacity,half time of bearing capacity process is defined and employed to study the time effect model.Shortcoming of hyperbolic model is validated in terms of it.According to mechanical analysis and some energy dissipating postulates,the governing differential equation for bearing capacity increasing process is developed,and a 3-parameter model for this process is established.Mathematical analysis shows that the hyperbolic model and its half-value time are corresponding degraded expressions of the established 3-parameter model,respectively.The 3-parameter model overcomes the shortcoming of hyperbolic model.Finally,good agreements have been found between simulated results of the proposed model and two field tests.
The time effect process of bearing capacity of preformed pile is an important and unsolved geotechnical subject.Based on the initial increasing rate and the maximum increment of bearing capacity,half time of bearing capacity process is defined and employed to study the time effect model.Shortcoming of hyperbolic model is validated in terms of it.According to mechanical analysis and some energy dissipating postulates,the governing differential equation for bearing capacity increasing process is developed,and a 3-parameter model for this process is established.Mathematical analysis shows that the hyperbolic model and its half-value time are corresponding degraded expressions of the established 3-parameter model,respectively.The 3-parameter model overcomes the shortcoming of hyperbolic model.Finally,good agreements have been found between simulated results of the proposed model and two field tests.
2008, 38(6): 58-61.
doi: 10.13204/j.gyjz200806016
Abstract:
The increase of water content will cause swelling deformation of expansive soil foundation.The swelling rate and pressure are raised linearly with water content.The change of water content of expansive soil foundation decreases linearly with depth within the atmosphere effect depth.The expansive rate is elliptic with overburden pressure.A formula of expansive rate is obtained.A calculation method for swelling deformation of expansive soil foundation is proposed with layer-wise summation method.The results of proposed method are identical with that of the model test,and the results of the code are on the large side.
The increase of water content will cause swelling deformation of expansive soil foundation.The swelling rate and pressure are raised linearly with water content.The change of water content of expansive soil foundation decreases linearly with depth within the atmosphere effect depth.The expansive rate is elliptic with overburden pressure.A formula of expansive rate is obtained.A calculation method for swelling deformation of expansive soil foundation is proposed with layer-wise summation method.The results of proposed method are identical with that of the model test,and the results of the code are on the large side.
2008, 38(6): 62-66.
doi: 10.13204/j.gyjz200806017
Abstract:
The bearing capacity characteristics and internal force distribution of transmission digging foundation with plumb and batter angle foundations under inclined loads are studied using extensive numerical modeling.The results reveal that the vertical bearing capacity of plumb foundations are changed less under the load inclination less than 10,while the vertical bearing capacity remarkably decreases when the load inclination is greater than 10.The vertical bearing capacity of foundation with positive batter angles is greater than the vertical and negative batter angles under the same inclined loading,meanwhile,the bending moment and shear force of foundation with positive batter angles are the less than the negative batter angles.In case of foundation batter angles are same with the load inclination proved to be the best configurations,the vertical bearing capacity is not decreased,on the other hand,the bending moment of this configuration is almost zero.
The bearing capacity characteristics and internal force distribution of transmission digging foundation with plumb and batter angle foundations under inclined loads are studied using extensive numerical modeling.The results reveal that the vertical bearing capacity of plumb foundations are changed less under the load inclination less than 10,while the vertical bearing capacity remarkably decreases when the load inclination is greater than 10.The vertical bearing capacity of foundation with positive batter angles is greater than the vertical and negative batter angles under the same inclined loading,meanwhile,the bending moment and shear force of foundation with positive batter angles are the less than the negative batter angles.In case of foundation batter angles are same with the load inclination proved to be the best configurations,the vertical bearing capacity is not decreased,on the other hand,the bending moment of this configuration is almost zero.
2008, 38(6): 67-70.
doi: 10.13204/j.gyjz200806018
Abstract:
Based on the transverse ribs distributed symmetrically and unsymmetrically rebar pull-out test,the bond-anchorage properties of the transverse ribs distributed symmetrically and unsymmetrically rebar have been investigated.The results show that: the conditions of anchorage,concrete strength and anchorage length are the same effects to bond-anchorage strength of the transverse ribs distributed symmetrically and unsymmetrically rebar.The bond-anchorage strength of the transverse ribs distribute symmetrically and unsymmetrically rebar is about the same,anchorage stress-ship curve(-) haven't the prominent difference.
Based on the transverse ribs distributed symmetrically and unsymmetrically rebar pull-out test,the bond-anchorage properties of the transverse ribs distributed symmetrically and unsymmetrically rebar have been investigated.The results show that: the conditions of anchorage,concrete strength and anchorage length are the same effects to bond-anchorage strength of the transverse ribs distributed symmetrically and unsymmetrically rebar.The bond-anchorage strength of the transverse ribs distribute symmetrically and unsymmetrically rebar is about the same,anchorage stress-ship curve(-) haven't the prominent difference.
2008, 38(6): 71-73,78.
doi: 10.13204/j.gyjz200806019
Abstract:
Based on the pullout bond tests for the GFRP bars embedded in cement mortar,the influence of the GFRP diameter,the cement mortar strength and the bond length on the bond properties of GFRP bars to cement mortar is studied.The experimental results illustrate that the average bond strength increases with the increase in bond length or the cement mortar strength,while it decreases with the increase in diameter of GFRP bar.In addition,the shear rigidity increases with the increase in diameter of GFRP bar or the cement mortar strength,while it decreases with the bond length.
Based on the pullout bond tests for the GFRP bars embedded in cement mortar,the influence of the GFRP diameter,the cement mortar strength and the bond length on the bond properties of GFRP bars to cement mortar is studied.The experimental results illustrate that the average bond strength increases with the increase in bond length or the cement mortar strength,while it decreases with the increase in diameter of GFRP bar.In addition,the shear rigidity increases with the increase in diameter of GFRP bar or the cement mortar strength,while it decreases with the bond length.
2008, 38(6): 74-78.
doi: 10.13204/j.gyjz200806020
Abstract:
A high performance reactive powder concrete(RPC) has been prepared by low-cost natural particles through the standard casting procedure and the hot-water curing condition.The cubic compressive strength,cylindrical uniaxial compressive strength,split tensile strength,flexural tensile strength and elastic modulus of RPC have been investigated in detail.The tendency of these quantities evolving with the increment of volumetric content of steel fibers has been analyzed.It is shown that the volumetric content of steel fibers has to be within 1%～2% in order to meet the requirements of the high performance,good workability and economy simultaneously.In addition,the relationships between the measured strengths and the elastic modulus of RPC and the volumetric contents of steel fibers have been empirically formulated.
A high performance reactive powder concrete(RPC) has been prepared by low-cost natural particles through the standard casting procedure and the hot-water curing condition.The cubic compressive strength,cylindrical uniaxial compressive strength,split tensile strength,flexural tensile strength and elastic modulus of RPC have been investigated in detail.The tendency of these quantities evolving with the increment of volumetric content of steel fibers has been analyzed.It is shown that the volumetric content of steel fibers has to be within 1%～2% in order to meet the requirements of the high performance,good workability and economy simultaneously.In addition,the relationships between the measured strengths and the elastic modulus of RPC and the volumetric contents of steel fibers have been empirically formulated.
2008, 38(6): 79-81,121.
doi: 10.13204/j.gyjz200806021
Abstract:
In order to treat the early cracking of airport concrete pavement properly,based on analyzing the causes and the forms of the pavement early cracking,different treatment methods of various cracks were gained systematically,and the technical requirements of grouting repair method and sawcut repair method for pavement early cracking were presented to give references for design and construction.
In order to treat the early cracking of airport concrete pavement properly,based on analyzing the causes and the forms of the pavement early cracking,different treatment methods of various cracks were gained systematically,and the technical requirements of grouting repair method and sawcut repair method for pavement early cracking were presented to give references for design and construction.
2008, 38(6): 82-85,91.
doi: 10.13204/j.gyjz200806022
Abstract:
The effects of different amount of water and pisolite on the workability and mechanical properties of pisolite grouting material(PGM) were studied.The results showed that the workability of PGM with 13% water content was better,the mechanics indexeal of PGM decreased with the increment of water,and increased with the enhancement of pisolite when the amount of water less than 14% and pisolite less than 35%,moreover,tensile strength of PGM was approximately 40% higher than that of ordinary concrete.Finally,based on the experimental data,the regression formulas among mechanical indexes were put forward.
The effects of different amount of water and pisolite on the workability and mechanical properties of pisolite grouting material(PGM) were studied.The results showed that the workability of PGM with 13% water content was better,the mechanics indexeal of PGM decreased with the increment of water,and increased with the enhancement of pisolite when the amount of water less than 14% and pisolite less than 35%,moreover,tensile strength of PGM was approximately 40% higher than that of ordinary concrete.Finally,based on the experimental data,the regression formulas among mechanical indexes were put forward.
2008, 38(6): 86-91.
doi: 10.13204/j.gyjz200806023
Abstract:
Based on the analysis of the static property of rigid shell of Anhui University Gymnasium,and from the working mechanism of beam string structure,the composition of cable-strut-supported shell structure is discussed and the characters of cable-strut-supported shell structure are analyzed.Inverse analysis method of construction process is extended on the ground of the definite status of structures.The optimization analysis of construction process of the cable-strut-supported shell structure is carried out with the inverse analysis method.Analysis result shows that whole cable-strut-supported shell structure is much better than partial structure.For the structures with large prestress,prestress should be applied by multiple steps,and the quantity of every step should be lowered to minimize the inner force and deformation,and to lower the difficulty of construction.The construction process should be finished slowly.
Based on the analysis of the static property of rigid shell of Anhui University Gymnasium,and from the working mechanism of beam string structure,the composition of cable-strut-supported shell structure is discussed and the characters of cable-strut-supported shell structure are analyzed.Inverse analysis method of construction process is extended on the ground of the definite status of structures.The optimization analysis of construction process of the cable-strut-supported shell structure is carried out with the inverse analysis method.Analysis result shows that whole cable-strut-supported shell structure is much better than partial structure.For the structures with large prestress,prestress should be applied by multiple steps,and the quantity of every step should be lowered to minimize the inner force and deformation,and to lower the difficulty of construction.The construction process should be finished slowly.
2008, 38(6): 92-95,29.
doi: 10.13204/j.gyjz200806024
Abstract:
Suzhou Hope Door is connected to a whole one by the pile foundation,big and small elliptical arches and cables,which influence and restrict each other under static and dynamic loads.The design theory and method of this special type of steel structure are summarized,as well as the design recommendations for this type of structure are proposed.
Suzhou Hope Door is connected to a whole one by the pile foundation,big and small elliptical arches and cables,which influence and restrict each other under static and dynamic loads.The design theory and method of this special type of steel structure are summarized,as well as the design recommendations for this type of structure are proposed.
2008, 38(6): 96-101.
doi: 10.13204/j.gyjz200806025
Abstract:
The roof of Samoa Aquatic Center is a complex hyperboloid.The roof structure is run-through steel truss composed of circular or rectangular hollow section steel tubes.Some curves are built to form the double-curved surface of the roof.A great lot of bracing members are arranged in the steel structure of roof because the wind load amounts to 1.89 kN/m2 in this area.At the same time,the shear force of main truss support joint is large,which is out of the requirements of code.The three-dimensional finite-element model is established and calculation is repeated.The result shows that the arrangement of structure and bracing satisfy the requirements of safety and economy.The sloping platform above the RC column is taken to transform part of the shear force of the main truss support to lift or compression force.As a result,the shear value can satisfy the requirements of calculation and construction.According to the requirements of calculation result,transportation and installation,several important joints are designed based on above results.
The roof of Samoa Aquatic Center is a complex hyperboloid.The roof structure is run-through steel truss composed of circular or rectangular hollow section steel tubes.Some curves are built to form the double-curved surface of the roof.A great lot of bracing members are arranged in the steel structure of roof because the wind load amounts to 1.89 kN/m2 in this area.At the same time,the shear force of main truss support joint is large,which is out of the requirements of code.The three-dimensional finite-element model is established and calculation is repeated.The result shows that the arrangement of structure and bracing satisfy the requirements of safety and economy.The sloping platform above the RC column is taken to transform part of the shear force of the main truss support to lift or compression force.As a result,the shear value can satisfy the requirements of calculation and construction.According to the requirements of calculation result,transportation and installation,several important joints are designed based on above results.
2008, 38(6): 102-105.
doi: 10.13204/j.gyjz200806026
Abstract:
Based on the similarity of T-stub connections and tension zone of extended end plate connections,this paper presents a three-dimensional(3D) nonlinear analysis finite element to study numerically the stiffness and strength of the T-stub connection as part of a comprehensive research program to investigate the behavior of endplate bolted connections.The moment-rotation curves,deformation of connections,distribution of prying force and variation with external force are analyzed.And the data on finite element are fully compared with those on the test.The research shows that the finite element method can exactly simulate the behavior of T-stub connections,the usual stiffener can't act effectively and distribution and change of prying force are deeply affected by the shape and thickness of endplate stiffeners.
Based on the similarity of T-stub connections and tension zone of extended end plate connections,this paper presents a three-dimensional(3D) nonlinear analysis finite element to study numerically the stiffness and strength of the T-stub connection as part of a comprehensive research program to investigate the behavior of endplate bolted connections.The moment-rotation curves,deformation of connections,distribution of prying force and variation with external force are analyzed.And the data on finite element are fully compared with those on the test.The research shows that the finite element method can exactly simulate the behavior of T-stub connections,the usual stiffener can't act effectively and distribution and change of prying force are deeply affected by the shape and thickness of endplate stiffeners.
2008, 38(6): 106-109.
doi: 10.13204/j.gyjz200806027
Abstract:
The distortional buckling performance of cold-formed C and Z section flexural members with upright and inclined edge stiffeners has been studied by finite element program of ANSYS.The results show that most of the bending strength of members with upright edge stiffeners is slightly higher than that of members with inclined edge stiffeners.And the bending strength of C and Z section members almost the same when the section parameters are the same.Comparison of the computed results with the results of direct strength method shows that most of the computed results are higher than that of direct strength method.
The distortional buckling performance of cold-formed C and Z section flexural members with upright and inclined edge stiffeners has been studied by finite element program of ANSYS.The results show that most of the bending strength of members with upright edge stiffeners is slightly higher than that of members with inclined edge stiffeners.And the bending strength of C and Z section members almost the same when the section parameters are the same.Comparison of the computed results with the results of direct strength method shows that most of the computed results are higher than that of direct strength method.
2008, 38(6): 110-112,116.
doi: 10.13204/j.gyjz200806028
Abstract:
The contents of simplified calculation method for fire design based on members and simplified judgment method for concrete spalling subjected to fire in EC2-1-2 are briefly introduced.Some issues that to be further investigated are presented.It can be served as reference for reinforced concrete(RC) and prestressed concrete(PC) structural fire design and for revising relevant standards in China.
The contents of simplified calculation method for fire design based on members and simplified judgment method for concrete spalling subjected to fire in EC2-1-2 are briefly introduced.Some issues that to be further investigated are presented.It can be served as reference for reinforced concrete(RC) and prestressed concrete(PC) structural fire design and for revising relevant standards in China.
2008, 38(6): 113-116.
doi: 10.13204/j.gyjz200806029
Abstract:
It is introduced a 130 m high RC smokestack reinforcement project in which self compacting concrete was applied.The reinforcement scheme,construction technology and quality control measures are emphasized.The reinforcement effect is good in practice.
It is introduced a 130 m high RC smokestack reinforcement project in which self compacting concrete was applied.The reinforcement scheme,construction technology and quality control measures are emphasized.The reinforcement effect is good in practice.
2008, 38(6): 117-121.
doi: 10.13204/j.gyjz200806030
Abstract:
The temperature field of insulated carbon FRP-strengthened concrete members exposing to fire was analyzed based on determination of fire insulation systems,and the temperature contours of sections were achieved.The calculated results are shown to agree well with the experimental data.It is possible for further researches on the mechanical behavior and fire performance of carbon FRP-strengthened concrete members under fire condition.
The temperature field of insulated carbon FRP-strengthened concrete members exposing to fire was analyzed based on determination of fire insulation systems,and the temperature contours of sections were achieved.The calculated results are shown to agree well with the experimental data.It is possible for further researches on the mechanical behavior and fire performance of carbon FRP-strengthened concrete members under fire condition.
