Researches On Characteristic Parameters Skeleton Curve Of Reinforced Concrete Shear Wall Under Horizontal Load

As a main lateral and vertical load resisting structural membe,reinforced concrete structural walls,is playing a important role in the high-building.The purpose of the paper is to study the skeleton curve of the reinforced concrete structural wall and make sure the simplified trilinear model of it,which is the base of using multi-layer shell element to do the elastic and plastic earthquake reaction analysis of the reinforced concrete structural walls.So deep understanding the skeleton curve of the,reinforced concrete structural walls,it is great significance for safety and reasonable seismic design of the reinforced concrete structural walls.which can provide reference to the engineering design later.This paper mainly researches on the following several aspects:(1)According to the seismic performance test of reinforced concrete shear wall made by predecessors,the finite element models of reinforced concrete structural walls are established by nonlinear finite element software MSC.Marc.The test results of fine fimite element anaysis results and a large number of domestic and foreign reinforced concrete structural wall are in good agreement.It is very helpful for the further study on the seismic behavior of the reinforced concrete structural walls.(2)Parameter study is conducted on reinforced concrete shear wall by MSC.Marc,the influence of the shear-span-to-wall-length ratio,axial compression ratio,the yield tensile strength of longitudinal bars in wall boundaries,the longitudinal reinforcement content in wall boundaries and the concrete strength on the effective stiffness.A simplified equation to evaluate the effective stiffness of reinforced concrete shear wall.is proposed on the basis of parametric study.(3)Parameter study is conducted on reinforced concrete shear wall by MSC.Marc,the different effects of the shear-span-to-wall-length ratio,the axial load ratio,the volumetric ratio of the web horizontal reinforcement,the concrete strength,the yield tensile strength of longitudinal bars in wall boundaries,the longitudinal reinforcement content in wall boundaries on the plastic hinge length of reinforced concrete shear wall.In light of the parametric investigation,a plastic hinge length expression was proposed,to determine the plasticity displacement of shear wall.(4)Based on the research results,a trilinear model of skeleton curve relationship is presented,and thestatistical formulas of characteristic model parameters are established.The trilinear model of skeleton curve has good agreement with the test results.The skeleton curve model can provide reference for seismic design of shear wall in futureThis thesis is sponsored by National Natural Science Foundation of China(NSFC)and the Natural Science Foundation of Hunan Province,China.(Grant No.51478174,14JJ3054).Their supports are greatly appreciated.