Simulation Analysis On The Stiffness Degradation And Shear Force Redistribution Of Spatial Coordinated Interaction Among Beams,Columns,Plates And Walls Of R.C Frame-shear Wall Structure

In frame-shear wall structure,the frame and shear wall are combined together to work through connection of the floor under the horizontal load.Due to the different performance of them,internal force redistribution would appear in structure.In order to study the influence of different parameters on the lateral performance of R.C frame-shear wall structure.The nonlinear finite element method based on degenerated three-dimension solid virtual laminated element theory is introduced.Firstly,by using the method,a seismic test of single-layer R.C frame-shear structure is simulated and analyzed.Through comparing,the simulated results are basically same with the experimental results.So the method is rational and applicable to analyze the lateral performance of frame-shear wall structure.And lay the foundation for the following study.After simulation analysis of the influence on the lateral performance of R.C frame and shear wall when considering the sectional feature and axial compression ratio.Results show that lateral stiffness degradation rate of frames with square columns is slower than rectangular column.The lateral stiffness degradation rate of shear wall is accelerated with the decrease of the wall section.The horizontal ultimate bearing capacity and initial lateral stiffness of R.C frame and shear wall increase with greater axial compression ratio.but its lateral stiffness degradation accelerated.In addition,as greater the axial compression ratio,the stiffness degradation coefficient limit become lower.Introducing influences of stiffness characteristic value and single and double sides of the shear wall,the nonlinear finite element analysis of R.C frame-shear wall structure analysis model was carried out by using the negative combination of axial compression ratio and sectional feature of shear-wall and column.By comparing the load displacement curve,stiffness degradation and shear distribution curve of frame-shear wall structure with different stiffness characteristic value,the damage process,the law of internal force redistribution and its mechanism,the influence on the bearing capacity of the structure under different stiffness characteristic value are analyzed in detail.When stiffness characteristic value is too small,the frame is not sufficient to act as the second line of defense.Secondly,compared with nonlinear analysis results of single and double side floor of shear-wall,relative to wall layout onboth sides of R.C frame shear structure,horizontal ultimate bearing capacity of structure with double side floor of shear-wall is higher,and degradation degree of frame is lower.The degradation degree of shear-wall is also lower etc.Finally,by collating the results to draw some useful conclusions to engineering design.