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2010 Vol. 40, No. 5
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2010, 40(5): 7-12,38.
doi: 10.13204/j.gyjz201005001
Abstract:
SRC frame-RC core wall hybrid structure exhibits good aseismic performance. A parametric model is established for hybrid structures with various stiffness characteristic value and core tube aspect ratio H/b selected as parameters. Cooperative bearing performance of hybrid structure in high seismic intensity region is stuided by nonlinear static analysis method,including distribution and redistribution rules of horizontal shear and overturning moment etc. Based on the aforementioned research,some suggestions on design controlling index of shear force sharing rate of outer frame are proposed.
SRC frame-RC core wall hybrid structure exhibits good aseismic performance. A parametric model is established for hybrid structures with various stiffness characteristic value and core tube aspect ratio H/b selected as parameters. Cooperative bearing performance of hybrid structure in high seismic intensity region is stuided by nonlinear static analysis method,including distribution and redistribution rules of horizontal shear and overturning moment etc. Based on the aforementioned research,some suggestions on design controlling index of shear force sharing rate of outer frame are proposed.
2010, 40(5): 13-18,27.
doi: 10.13204/j.gyjz201005002
Abstract:
In order to explore the forced behavior of vertical members for SRC frame-RC core wall hybrid structure,a parametric model is established for hybrid structures with various stiffness characteristic value and core tube aspect ratio H/b selected as parameters. Mechanical behavior of vertical members for hybrid structure is stuided by using nonlinear static analysis method,including the internal force state,change trend and failure confine etc. of core wall and outer frame column. Based on the aforementioned research,some suggestions on vertical menber design and member axial compression ratio controlling index are proposed.
In order to explore the forced behavior of vertical members for SRC frame-RC core wall hybrid structure,a parametric model is established for hybrid structures with various stiffness characteristic value and core tube aspect ratio H/b selected as parameters. Mechanical behavior of vertical members for hybrid structure is stuided by using nonlinear static analysis method,including the internal force state,change trend and failure confine etc. of core wall and outer frame column. Based on the aforementioned research,some suggestions on vertical menber design and member axial compression ratio controlling index are proposed.
2010, 40(5): 19-23,50.
doi: 10.13204/j.gyjz201005003
Abstract:
Twenty-nine finite element models of a ten-story frame structure were set up to investigate the influences on its natural vibrating period of the filled wall. The main influential factors included the walls material,its spatial arrangement,and its quantity in weak story. Results indicate that the performance of filled walls materials has little influence on the frames natural vibrating period. The quantity of filled walls in weak floor and the location of weak floor are the two main influence factors. Based on numerical analysis,the modified models for calculating the frames natural vibrating period are presented,where the influences of filled wall are given.
Twenty-nine finite element models of a ten-story frame structure were set up to investigate the influences on its natural vibrating period of the filled wall. The main influential factors included the walls material,its spatial arrangement,and its quantity in weak story. Results indicate that the performance of filled walls materials has little influence on the frames natural vibrating period. The quantity of filled walls in weak floor and the location of weak floor are the two main influence factors. Based on numerical analysis,the modified models for calculating the frames natural vibrating period are presented,where the influences of filled wall are given.
2010, 40(5): 24-27.
doi: 10.13204/j.gyjz201005004
Abstract:
A static test for one 4-story composite structure of short-limb shear with the masonry filler wall is conducted under low-cyclic loading. Based on the experimental results,the bearing capacity,deterioration process of stiffness,ductility,hysteretic curves,energy dissipation and failure characters are analyzed. The analysis results show that the values of initial stiffness,yielding load and ultimate bearing capacity have been improved obviously.The short-limb shear with the masonry filler wall has the advantage of dual function structure,which is a new aseismic shear wall. Some suggestions for engineering design are also presented in this paper.
A static test for one 4-story composite structure of short-limb shear with the masonry filler wall is conducted under low-cyclic loading. Based on the experimental results,the bearing capacity,deterioration process of stiffness,ductility,hysteretic curves,energy dissipation and failure characters are analyzed. The analysis results show that the values of initial stiffness,yielding load and ultimate bearing capacity have been improved obviously.The short-limb shear with the masonry filler wall has the advantage of dual function structure,which is a new aseismic shear wall. Some suggestions for engineering design are also presented in this paper.
2010, 40(5): 28-32.
doi: 10.13204/j.gyjz201005005
Abstract:
Based on practical project,a pseudo-static test was conducted on a 6-story RC frame model with special-shaped columns,which is 1/3 in size of the prototype under 8 degree seismic intensity. The anti-seismic property is appraised comprehensively by analyzing the hysteretic behavior,ductility,plastic hinges of beams and columns,strength and rigidity deterioration regression. The results show that RC frame with special-shaped columns has good anti-seismic property. Finite element analysis of the RC frame was conducted. The analytic result agreed well with the test result. Hence the FE model was reasonable,which could be used for the research on the RC frame structure with special-shaped columns.
Based on practical project,a pseudo-static test was conducted on a 6-story RC frame model with special-shaped columns,which is 1/3 in size of the prototype under 8 degree seismic intensity. The anti-seismic property is appraised comprehensively by analyzing the hysteretic behavior,ductility,plastic hinges of beams and columns,strength and rigidity deterioration regression. The results show that RC frame with special-shaped columns has good anti-seismic property. Finite element analysis of the RC frame was conducted. The analytic result agreed well with the test result. Hence the FE model was reasonable,which could be used for the research on the RC frame structure with special-shaped columns.
2010, 40(5): 33-38.
doi: 10.13204/j.gyjz201005006
Abstract:
By using full-scale model test method,the seismic behavior indexes of prestressed precast concrete beamcolumn assemblies under low-cyclic reversed load are studied,such as failure pattern,hysteretic characteristic,skeleton curve,stiffness deterioration,energy dissipation and rotation of the beam end. The results indicate that this kind of assembly has better energy dissipation and enough displacement restoring capacity by prestressed tendons. It is also suggested that some measures should be taken to improve its seismic behavior.
By using full-scale model test method,the seismic behavior indexes of prestressed precast concrete beamcolumn assemblies under low-cyclic reversed load are studied,such as failure pattern,hysteretic characteristic,skeleton curve,stiffness deterioration,energy dissipation and rotation of the beam end. The results indicate that this kind of assembly has better energy dissipation and enough displacement restoring capacity by prestressed tendons. It is also suggested that some measures should be taken to improve its seismic behavior.
2010, 40(5): 39-42.
doi: 10.13204/j.gyjz201005007
Abstract:
A new type controllable damping-viscous damper is designed and manufactured,whose dynamic property is tested by a full-size model. It is examined that its working frequency range and its dynamic mechanical characteristics. The results of this test show that the hysteretic curves have a full figure,state of working is stable,and its typical characteristics of transformable damping can be found easily.
A new type controllable damping-viscous damper is designed and manufactured,whose dynamic property is tested by a full-size model. It is examined that its working frequency range and its dynamic mechanical characteristics. The results of this test show that the hysteretic curves have a full figure,state of working is stable,and its typical characteristics of transformable damping can be found easily.
2010, 40(5): 43-46.
doi: 10.13204/j.gyjz201005008
Abstract:
A new type controllable damping-viscous damper is designed and manufactured,at present it's impossible to proceed computational analysis by available softwares. In this paper the structural dynamic equations of MDOFsystem sturetures with supplemental controllable damping-viscous damper are created,a practicable analysis method is proposed,the solution of time history method is deduced. A corresponding program is completed by Matlab languages; the results of calculations with some examples shows that the effect of vibration absorption is remarkable,especially for the high and supple MDOF-system sturetures with supplemental controllable damping-viscous damper.
A new type controllable damping-viscous damper is designed and manufactured,at present it's impossible to proceed computational analysis by available softwares. In this paper the structural dynamic equations of MDOFsystem sturetures with supplemental controllable damping-viscous damper are created,a practicable analysis method is proposed,the solution of time history method is deduced. A corresponding program is completed by Matlab languages; the results of calculations with some examples shows that the effect of vibration absorption is remarkable,especially for the high and supple MDOF-system sturetures with supplemental controllable damping-viscous damper.
2010, 40(5): 47-50.
doi: 10.13204/j.gyjz201005009
Abstract:
It was studied that the aseismic behavior,such as crack distribution,failure mode,hysteretic curve and displacement ductility etc of a precast prestressed reinforced concrete frame through low-cyclic reversed load test. The pushover analysis of a model of the frame was done by SAP 2000 software. The result showed that such reinforced frame had good aseimic behavior; and the tested ultimate bearing capacity and the position of plastic hinge agreed well with the results of pushover analysis.
It was studied that the aseismic behavior,such as crack distribution,failure mode,hysteretic curve and displacement ductility etc of a precast prestressed reinforced concrete frame through low-cyclic reversed load test. The pushover analysis of a model of the frame was done by SAP 2000 software. The result showed that such reinforced frame had good aseimic behavior; and the tested ultimate bearing capacity and the position of plastic hinge agreed well with the results of pushover analysis.
2010, 40(5): 51-54.
doi: 10.13204/j.gyjz201005010
Abstract:
According to the characteristics of an irregular-shaped pillar framework as well as the structural damage mechanism,this thesis analyses the aseismic measures for controlling the irregular-shaped pillar framework and how to calculate the bearing capacity of its cross-section,thereby enhancing the overall a seismic capability of the irregular-shaped pillar framework and ensuring its structural integrity.
According to the characteristics of an irregular-shaped pillar framework as well as the structural damage mechanism,this thesis analyses the aseismic measures for controlling the irregular-shaped pillar framework and how to calculate the bearing capacity of its cross-section,thereby enhancing the overall a seismic capability of the irregular-shaped pillar framework and ensuring its structural integrity.
2010, 40(5): 55-58.
doi: 10.13204/j.gyjz201005011
Abstract:
This paper,by taking the university of Tokyo hospital as the research object,mostly analyzes the design methods and the concepts,and how to realize a balance between function integration and space optimization for the hospital extension,from three aspects of hospital street,humanisation space and intelligent system,which can provide a reference for the future modern large-scale general hospital building design.
This paper,by taking the university of Tokyo hospital as the research object,mostly analyzes the design methods and the concepts,and how to realize a balance between function integration and space optimization for the hospital extension,from three aspects of hospital street,humanisation space and intelligent system,which can provide a reference for the future modern large-scale general hospital building design.
2010, 40(5): 59-61,69.
doi: 10.13204/j.gyjz201005012
Abstract:
Liyuan Buildings,the special residential buildings,are one of the characteristics of Qingdao. It has a close relationship with the local culture,which also represents the history of this city. However,the current process of urbanization is a serious threat to the existence of such unique buildings. Therefore,it is urgent to protect the Liyuan Residence,and pass on and revitalize theLiyuan Culture. The methods of dynamic protection and regional linkage are used to reconstructLiyuan Buildignsfrom material,economy and cultures,thus realizing the goal of protection and sustainable development of Liyuan Building, which will be renewed and revitalized in the multiarchitectural and cultural era,and also become a dynamic mechanism of urban modernization.
Liyuan Buildings,the special residential buildings,are one of the characteristics of Qingdao. It has a close relationship with the local culture,which also represents the history of this city. However,the current process of urbanization is a serious threat to the existence of such unique buildings. Therefore,it is urgent to protect the Liyuan Residence,and pass on and revitalize theLiyuan Culture. The methods of dynamic protection and regional linkage are used to reconstructLiyuan Buildignsfrom material,economy and cultures,thus realizing the goal of protection and sustainable development of Liyuan Building, which will be renewed and revitalized in the multiarchitectural and cultural era,and also become a dynamic mechanism of urban modernization.
2010, 40(5): 62-69.
doi: 10.13204/j.gyjz201005013
Abstract:
Based on cavity expansion theory,with the assumption that compaction stress acted on the wall of the pile was constant,some scholars proposed analytical answer to the setup of jacked-in piles in cohesive soil. But in-situ tests showed that compaction stress was decayed constantly. A series of triaxial strain-holding tests were conducted,and the results of tests showed that the compaction stress decayed linearly with logarithmic time appreciatively,the effective stress decreased at the beginning and then increased later during consolidation of the soil near to the piles,and the increment of the effective stress was only 0.20～0.27 times the excess pore pressure. So it would be overestimatied pile bearing capacity by assuming that compaction stress was constant.
Based on cavity expansion theory,with the assumption that compaction stress acted on the wall of the pile was constant,some scholars proposed analytical answer to the setup of jacked-in piles in cohesive soil. But in-situ tests showed that compaction stress was decayed constantly. A series of triaxial strain-holding tests were conducted,and the results of tests showed that the compaction stress decayed linearly with logarithmic time appreciatively,the effective stress decreased at the beginning and then increased later during consolidation of the soil near to the piles,and the increment of the effective stress was only 0.20～0.27 times the excess pore pressure. So it would be overestimatied pile bearing capacity by assuming that compaction stress was constant.
2010, 40(5): 70-73.
doi: 10.13204/j.gyjz201005014
Abstract:
Based on the one-dimension stress wave theory,the low strain dynamic test of concrete pile whose top is restricted or not is studied by finite element explicit analysis method. The dynamic tests of top-restricted concrete pile are affected not only by the soil around pile,but also by the upper structure,and the signal of 3D effect reflected by the pile is stronger. Then,the interference of the upper structure is filtered through signal progress. Finally,the simulated curves are in good agreement with those obtained from field measurements. So the simulation of concrete pile dynamic test is reliable and the conclusion may be a guidance of increasing the accuracy of the low strain dynamic test of concrete pile.
Based on the one-dimension stress wave theory,the low strain dynamic test of concrete pile whose top is restricted or not is studied by finite element explicit analysis method. The dynamic tests of top-restricted concrete pile are affected not only by the soil around pile,but also by the upper structure,and the signal of 3D effect reflected by the pile is stronger. Then,the interference of the upper structure is filtered through signal progress. Finally,the simulated curves are in good agreement with those obtained from field measurements. So the simulation of concrete pile dynamic test is reliable and the conclusion may be a guidance of increasing the accuracy of the low strain dynamic test of concrete pile.
2010, 40(5): 74-78,81.
doi: 10.13204/j.gyjz201005015
Abstract:
Based on the documentation [1],the implicity calculation formula of composite pile-soil stress ratio was simplified by analyzing the deformation character of composite foundation of rigid pile with cap and taking no account of the compression deformation of composite pile,the explicit calculation formula also was deduced for the composite foundation of end bearing pile with cap and friction pile with cap,the settlement calculation formula was obtained according to the mode of soil besides pile cap for composite foundation of rigid pile with cap. At last,by comparing the calculation results with those form documentation [1],it was verified that the feasibility and effectivence of the calculation method.
Based on the documentation [1],the implicity calculation formula of composite pile-soil stress ratio was simplified by analyzing the deformation character of composite foundation of rigid pile with cap and taking no account of the compression deformation of composite pile,the explicit calculation formula also was deduced for the composite foundation of end bearing pile with cap and friction pile with cap,the settlement calculation formula was obtained according to the mode of soil besides pile cap for composite foundation of rigid pile with cap. At last,by comparing the calculation results with those form documentation [1],it was verified that the feasibility and effectivence of the calculation method.
2010, 40(5): 79-81.
doi: 10.13204/j.gyjz201005016
Abstract:
The hyperbolic function is used to fit the e-p data of consolidation tests,with which,the hyperbolic model of the void ratio and effective consolidation stress is presented. On the basis of the permeability coefficient and the void ratio,the relationship between consolidation coefficient and effective consolidation stress of soft clay under compression is derived through the e-p hyperbolic model. The results of the indoor experimental of seepage pressure show that the calculation model is reasonable. In this paper,the calculation model reflects well the relationship between consolidation coefficient and effective consolidation stress, which provides a useful reference for the engineering design.
The hyperbolic function is used to fit the e-p data of consolidation tests,with which,the hyperbolic model of the void ratio and effective consolidation stress is presented. On the basis of the permeability coefficient and the void ratio,the relationship between consolidation coefficient and effective consolidation stress of soft clay under compression is derived through the e-p hyperbolic model. The results of the indoor experimental of seepage pressure show that the calculation model is reasonable. In this paper,the calculation model reflects well the relationship between consolidation coefficient and effective consolidation stress, which provides a useful reference for the engineering design.
2010, 40(5): 82-86,113.
doi: 10.13204/j.gyjz201005017
Abstract:
It is recognized by concrete frame theory that a concrete is consisted of coarse aggregate,mortar and transition layer between coarse aggregate and mortar. Concrete frame theory was expounded,and conception of standard concrete was proposed in the paper. It was obtained compressive of standard concrete in different ages and strength equation between standard concrete and cement mortar strength. The frame effect of coarse aggregate was researched from mortar ratio deviation with literature review,based on which math model was established,and the influence of different coarse aggregates on concrete strength and workability was analyzed. Math model was further tested with recycled aggregate,lightweight concrete and fly ash concrete. It was concluded that there was a good correlation between strength and mortar ratio deviation,and mortar ratio deviation is an important parameter to research concrete frame theory.
It is recognized by concrete frame theory that a concrete is consisted of coarse aggregate,mortar and transition layer between coarse aggregate and mortar. Concrete frame theory was expounded,and conception of standard concrete was proposed in the paper. It was obtained compressive of standard concrete in different ages and strength equation between standard concrete and cement mortar strength. The frame effect of coarse aggregate was researched from mortar ratio deviation with literature review,based on which math model was established,and the influence of different coarse aggregates on concrete strength and workability was analyzed. Math model was further tested with recycled aggregate,lightweight concrete and fly ash concrete. It was concluded that there was a good correlation between strength and mortar ratio deviation,and mortar ratio deviation is an important parameter to research concrete frame theory.
2010, 40(5): 87-91.
doi: 10.13204/j.gyjz201005018
Abstract:
Based on the workability test of fiber reinforced self-compacting concrete， this paper presents theexperimental study on flexural behavior of seven sets of hybrid fiber reinforced self-compacting concrete beams withoutreinforcement and five sets of hybrid fiber reinforced self-compacting concrete beams with low reinforcement ratios.The influence of fiber aspect ratio and fiber type on crack load，yield load，ultimate load and flexural toughness are analyzed. The results indicate that the flexural toughness increases with increasing of fiber aspect ratio. The flexural toughness of hybrid fiber reinforced self-compacting concrete beams is better than that of steel fiber，which indicates positive hybrid effect. Compared to RC beam with a minimum longitudinal reinforcement，the yield load and ultimate load of fiber reinforced RC beams are greatly improved. The ultimate load of 40 + 4kg /m3 hybrid fiber reinforced RC beam with a minimum longitudinal reinforcement is similar to that of RC beam with 1.5 times of a minimum longitudinal reinforcement.
Based on the workability test of fiber reinforced self-compacting concrete， this paper presents theexperimental study on flexural behavior of seven sets of hybrid fiber reinforced self-compacting concrete beams withoutreinforcement and five sets of hybrid fiber reinforced self-compacting concrete beams with low reinforcement ratios.The influence of fiber aspect ratio and fiber type on crack load，yield load，ultimate load and flexural toughness are analyzed. The results indicate that the flexural toughness increases with increasing of fiber aspect ratio. The flexural toughness of hybrid fiber reinforced self-compacting concrete beams is better than that of steel fiber，which indicates positive hybrid effect. Compared to RC beam with a minimum longitudinal reinforcement，the yield load and ultimate load of fiber reinforced RC beams are greatly improved. The ultimate load of 40 + 4kg /m3 hybrid fiber reinforced RC beam with a minimum longitudinal reinforcement is similar to that of RC beam with 1.5 times of a minimum longitudinal reinforcement.
2010, 40(5): 92-94,103.
doi: 10.13204/j.gyjz201005019
Abstract:
The aggregate in a concrete，in particular，the coarse aggregate has a restriction on the contraction of the cement，which is the main component resisting the contraction of the cement in the concrete. Coarse and fine aggregate，however，as a local material，has a relative poor stability. In this paper，through the plate test，it is studied the effects of aggregate species，sand percentage，clay content，volume levels ect on the early anticracking of concrete.
The aggregate in a concrete，in particular，the coarse aggregate has a restriction on the contraction of the cement，which is the main component resisting the contraction of the cement in the concrete. Coarse and fine aggregate，however，as a local material，has a relative poor stability. In this paper，through the plate test，it is studied the effects of aggregate species，sand percentage，clay content，volume levels ect on the early anticracking of concrete.
2010, 40(5): 95-99.
doi: 10.13204/j.gyjz201005020
Abstract:
The construction monitoring method of cast-in-situ cantilever rigid frame bridge is introduced，which includes structure analysis，data collection in field，parameter identification，model modifying and construction instruction. By data cellection in field，model modifying，command-giving，the designing status of the bridge is guaranteed. Taking the Dapo Guijiang bridge of Majiang-Wuzhou Expressway Project for example，it is introduced the monitoring method. The measured data show that excellent effect has been got by the monitoring method.
The construction monitoring method of cast-in-situ cantilever rigid frame bridge is introduced，which includes structure analysis，data collection in field，parameter identification，model modifying and construction instruction. By data cellection in field，model modifying，command-giving，the designing status of the bridge is guaranteed. Taking the Dapo Guijiang bridge of Majiang-Wuzhou Expressway Project for example，it is introduced the monitoring method. The measured data show that excellent effect has been got by the monitoring method.
2010, 40(5): 100-103.
doi: 10.13204/j.gyjz201005021
Abstract:
During the tunnel construction，uncertainty of forward geological condition leads to incipient faults of construction and geological disasters. Thus，it is significantly necessary to study geologic prediction. This paper not only introduces the basic principle，data collection and data analysis of tunnel seismic prediction(TSP) system，but also presents its application to the construction of Yinzuiyan Tunnel. Through the comparisons among geological analysis，result of TSP system and the actual situation，the advantages of TSP system are proved，such as accuracy and fast prediction speed. Besides，some shortages of TSP system are summarized.
During the tunnel construction，uncertainty of forward geological condition leads to incipient faults of construction and geological disasters. Thus，it is significantly necessary to study geologic prediction. This paper not only introduces the basic principle，data collection and data analysis of tunnel seismic prediction(TSP) system，but also presents its application to the construction of Yinzuiyan Tunnel. Through the comparisons among geological analysis，result of TSP system and the actual situation，the advantages of TSP system are proved，such as accuracy and fast prediction speed. Besides，some shortages of TSP system are summarized.
2010, 40(5): 104-108.
doi: 10.13204/j.gyjz201005022
Abstract:
The seismic behaviors experiments of the Olympic Games badminton gymnasium suspendome structure 1∶10 model by the multiple vibration table array system were conducted in this paper. Frequencies of different mode steps，modes and damp ratios of the model were tested by ambient excitation method and sine excitation method. The responses and rules of acceleration，displacement and stress of the structure under the earthquake were gained. The experiment results indicated that material of the structure was in elastic phase，and had good anti-seismic performance under 8 degree strong earthquake.
The seismic behaviors experiments of the Olympic Games badminton gymnasium suspendome structure 1∶10 model by the multiple vibration table array system were conducted in this paper. Frequencies of different mode steps，modes and damp ratios of the model were tested by ambient excitation method and sine excitation method. The responses and rules of acceleration，displacement and stress of the structure under the earthquake were gained. The experiment results indicated that material of the structure was in elastic phase，and had good anti-seismic performance under 8 degree strong earthquake.
2010, 40(5): 109-113.
doi: 10.13204/j.gyjz201005023
Abstract:
If the dimension of rectangular openings designed suitably in practical projects，pipes and wires will not only expediently pass through the beam web to reduce the story height of a building and increase economic benefits，but also move the plastic hinge far away from the connection. In this way，it can avoid the connection failure before the members，and ensures the structural integrity and make it no collapse. The dimension of openings and the distance between the opening and the column surface are determined by the restriction requirement for beam web by flange，the shear-bearing requirements of web，the ratio of the moment at beam end to the moment at reduced section and preventing compressive plate local buckling. While with openings on web，the element stiffness matrix of frame element and the internal force and displacements of structure will be affected out of question. Therefore，it is necessary to research the element stiffness matrix of frame element. In order to decrease the amount of calculation，the beam is handled as a link element. Virtual work theory is used to derive the element stiffness matrix of frame element with openings on web，and compared with the result of finite analysis method. It shows a satisfactory agreement between calculated and finite analysis results.
If the dimension of rectangular openings designed suitably in practical projects，pipes and wires will not only expediently pass through the beam web to reduce the story height of a building and increase economic benefits，but also move the plastic hinge far away from the connection. In this way，it can avoid the connection failure before the members，and ensures the structural integrity and make it no collapse. The dimension of openings and the distance between the opening and the column surface are determined by the restriction requirement for beam web by flange，the shear-bearing requirements of web，the ratio of the moment at beam end to the moment at reduced section and preventing compressive plate local buckling. While with openings on web，the element stiffness matrix of frame element and the internal force and displacements of structure will be affected out of question. Therefore，it is necessary to research the element stiffness matrix of frame element. In order to decrease the amount of calculation，the beam is handled as a link element. Virtual work theory is used to derive the element stiffness matrix of frame element with openings on web，and compared with the result of finite analysis method. It shows a satisfactory agreement between calculated and finite analysis results.
2010, 40(5): 114-118,108.
doi: 10.13204/j.gyjz201005024
Abstract:
Six concrete filled double-skin steel tubular (CFDST) columns were tested under bi-eccentric loading condition,in order to study the effects of slenderness ratio,load eccentricity and load angle on the mechanical behavior of the specimens. The test results show that the deformation of the specimens agrees basically with the planesection assumption; the larger the slenderness ratio and load eccentricity,the lower the bearing capacity; load angle has little effect on the load-deformation relationship curves. Finally,load-deformation relationship curves of CFDST subjected to biaxial compression are analyzed by fiber element method. The calculated results are compared with the experimental results,and they agreed well with each other.
Six concrete filled double-skin steel tubular (CFDST) columns were tested under bi-eccentric loading condition,in order to study the effects of slenderness ratio,load eccentricity and load angle on the mechanical behavior of the specimens. The test results show that the deformation of the specimens agrees basically with the planesection assumption; the larger the slenderness ratio and load eccentricity,the lower the bearing capacity; load angle has little effect on the load-deformation relationship curves. Finally,load-deformation relationship curves of CFDST subjected to biaxial compression are analyzed by fiber element method. The calculated results are compared with the experimental results,and they agreed well with each other.
2010, 40(5): 119-123.
doi: 10.13204/j.gyjz201005025
Abstract:
In this study，two methods of out-of-plane stiffening are introduced，one is reinforced concrete plate stiffening，and the other is rigid plate stiffening. The shear strength，stiffness，ductility and energy dissipation capacity of stiffened and unstiffened slit walls under shear loading are studied by means of nonlinear finite element analysis using ABAQUS software. Large-deflection effects and out-of-plane initial imperfection are considered. The effect of two stiffening methods on the out-of-plane buckling and stress patterns of slit steel panels are also investigated. The analysis results show that using reinforced concrete plate as a stiffening panel can effectively prevent the elastic buckling as well as development of diagonal tension field action，and significantly increase the shear strength，ductility and energy dissipation capacity. Considering the brittle shear failure of concrete itself，to better restrain the out-of-plane buckling of slit steel panels，it is suggested that the reinforced concrete plate should not be engaged in resisting the lateral-force from early stages.
In this study，two methods of out-of-plane stiffening are introduced，one is reinforced concrete plate stiffening，and the other is rigid plate stiffening. The shear strength，stiffness，ductility and energy dissipation capacity of stiffened and unstiffened slit walls under shear loading are studied by means of nonlinear finite element analysis using ABAQUS software. Large-deflection effects and out-of-plane initial imperfection are considered. The effect of two stiffening methods on the out-of-plane buckling and stress patterns of slit steel panels are also investigated. The analysis results show that using reinforced concrete plate as a stiffening panel can effectively prevent the elastic buckling as well as development of diagonal tension field action，and significantly increase the shear strength，ductility and energy dissipation capacity. Considering the brittle shear failure of concrete itself，to better restrain the out-of-plane buckling of slit steel panels，it is suggested that the reinforced concrete plate should not be engaged in resisting the lateral-force from early stages.
2010, 40(5): 124-128,132.
doi: 10.13204/j.gyjz201005026
Abstract:
The finite element (FE) modeling method for steel reinforced high performance concrete (SRHPC) composite structure taking account of the interfacial bond-slip is proposed in this research. A comparison between FE results and test results validates the accuracy of the proposed method. The SRHPC structure is numerically analyzed by varying the design parameters，such as axial compression ratio，concrete strength，steel ratio and steel strength.The influence of these parameters on structural performance is discussed. The results show that structural performance is sensitive to steel strength. Bearing capacity and deformation capacity can be effectively improved as steel strength increases. The axial load has negative influence on the structural deformation capacity. However，if axial compression ratio is less than 0.4，the structural bearing capacity increases to some extent ration. If axial compression ratio is larger than 0.4，the structural performance，especially the negative stiffness，decreases rapidly as axial compression ratio increases.
The finite element (FE) modeling method for steel reinforced high performance concrete (SRHPC) composite structure taking account of the interfacial bond-slip is proposed in this research. A comparison between FE results and test results validates the accuracy of the proposed method. The SRHPC structure is numerically analyzed by varying the design parameters，such as axial compression ratio，concrete strength，steel ratio and steel strength.The influence of these parameters on structural performance is discussed. The results show that structural performance is sensitive to steel strength. Bearing capacity and deformation capacity can be effectively improved as steel strength increases. The axial load has negative influence on the structural deformation capacity. However，if axial compression ratio is less than 0.4，the structural bearing capacity increases to some extent ration. If axial compression ratio is larger than 0.4，the structural performance，especially the negative stiffness，decreases rapidly as axial compression ratio increases.
2010, 40(5): 129-132.
doi: 10.13204/j.gyjz201005027
Abstract:
The large-span industrial building is one of the most positive architectural forms in the transformation practice of industrial buildings in post-industrial era. Due to the big size and flexible interior space,the large-span industrial building is easy to split into different functional spaces and transformed into various forms. This thesis tries to explore the technical strategy in the process of the reuse of large-span industrial buildings in terms of structure reformation,constitution retrofit,equipment replacement and material integrating.
The large-span industrial building is one of the most positive architectural forms in the transformation practice of industrial buildings in post-industrial era. Due to the big size and flexible interior space,the large-span industrial building is easy to split into different functional spaces and transformed into various forms. This thesis tries to explore the technical strategy in the process of the reuse of large-span industrial buildings in terms of structure reformation,constitution retrofit,equipment replacement and material integrating.
2010, 40(5): 133-136,145.
doi: 10.13204/j.gyjz201005028
Abstract:
In the progress of rapid urbanization,the old industrial buildings are vanishing with the change in industries. The conservation and reuse of the old industrial buildings having a history memory of the city have become important issues faced with architects. With one old industrial building in Changsha as the case,the paper points out that the conservation and reuse of the old industrial buildings should be started on urban sections according to their nature of value,and thus they can be renewed.
In the progress of rapid urbanization,the old industrial buildings are vanishing with the change in industries. The conservation and reuse of the old industrial buildings having a history memory of the city have become important issues faced with architects. With one old industrial building in Changsha as the case,the paper points out that the conservation and reuse of the old industrial buildings should be started on urban sections according to their nature of value,and thus they can be renewed.
Recovering．Rebuilding．Continuity：A review of reconstruction design of 642 Fuxing Zhonglu in Shanghai
2010, 40(5): 137-139,54.
doi: 10.13204/j.gyjz201005029
Abstract:
In recent years,the detail of architecture design with creativity has been a key factor of the entire design,which is due to the continuous increasing of requirements for protection,use and even repair and maintenance of historic buildings. Usually,rebuilding by means of being recovered reflects the historic continuity through detail of the building.
In recent years,the detail of architecture design with creativity has been a key factor of the entire design,which is due to the continuous increasing of requirements for protection,use and even repair and maintenance of historic buildings. Usually,rebuilding by means of being recovered reflects the historic continuity through detail of the building.
2010, 40(5): 140-142.
doi: 10.13204/j.gyjz201005030
Abstract:
A strengthening design of pre-stressed concrete plate with cracks is made according to results of structure diagnosis,and calculation model is put forward. Basalt fiber sheets are used to strengthen pre-stressed concrete plate and the analysis of all course is done,whose results are evaluated by calculation,which indicated that the bearing capacity of the said plate is raised.
A strengthening design of pre-stressed concrete plate with cracks is made according to results of structure diagnosis,and calculation model is put forward. Basalt fiber sheets are used to strengthen pre-stressed concrete plate and the analysis of all course is done,whose results are evaluated by calculation,which indicated that the bearing capacity of the said plate is raised.
2010, 40(5): 143-145.
doi: 10.13204/j.gyjz201005031
Abstract:
Six columns on the first and second floors of a commercial building in Qingdao are required to be removed for functional purpose. The structural form of the building is RC frame,having 2 stories in the basement and 3 stories above the ground (4 stories partially) . Due to the columns removed,the span of the corresponding beam is increased to 18 meters. Bonded prestress technique is used to strengthen the original frame beam in order to sustain the increased loads,good result is obtained. The method used in this project can be referred by the reinforcing design of similar projects.
Six columns on the first and second floors of a commercial building in Qingdao are required to be removed for functional purpose. The structural form of the building is RC frame,having 2 stories in the basement and 3 stories above the ground (4 stories partially) . Due to the columns removed,the span of the corresponding beam is increased to 18 meters. Bonded prestress technique is used to strengthen the original frame beam in order to sustain the increased loads,good result is obtained. The method used in this project can be referred by the reinforcing design of similar projects.
2010, 40(5): 146-148.
doi: 10.13204/j.gyjz201005032
Abstract:
According to summarizing the influencing factors of the colors of the folk houses in Huizhou,whose causes are analysed to tap their cultural connotation. A systematic summary of the color system of the folk houses in Anhui is given,which can provide a basis and guidance for creating regional features in a city.
According to summarizing the influencing factors of the colors of the folk houses in Huizhou,whose causes are analysed to tap their cultural connotation. A systematic summary of the color system of the folk houses in Anhui is given,which can provide a basis and guidance for creating regional features in a city.
