Application Of Damage Constitutive Model For Concrete To The Nonlinear Response Analysis For Shear Wall System

In recent years, high-rise buildings and skyscrapers have been developed very quickly in China. Among these high-rise buildings, the shear wall structure dominates the structural forms. Despite many researches on the shear wall system, it is far from well developed to the end of refined design of structures. Therefore, in order to make design of structures keep up with the development in the future, it is essential to do further researches on the nonlinear behaviors of the shear wall system.The constitutive law plays a significant role in the analysis for structures. What constitutive model has been applied to analysis of structures will directly influence the development process of load-displacement curve of the global structure. Based on this consideration, in the present thesis an advanced elastoplastic constitutive model based on damage energy release rate has been introduced into the structural analysis. The characteristics of stress distribution in the elements of shear walls are studied. Then a macroscopic shear wall model is employed, where the stiffness of the axial springs and the shear springs are calibrated by applying the damage constitutive law to the membrance elements under the assumption that the shear stress is uniformly distributed. Further, the element stiffness matrix can be determined. This macroscopic element can been used to nonlinear response analysis of shear wall structures. The major difference between the present researches and the researches in the existing literatures is that the two-dimensional damage constitutive law, instead of one-dimensional equivalent constitutive law, is introduced in calibrating parameters of the springs. Computer codes on nonlinear response analysis based on arc-length method is programmed. Two shear walls are studied by the proposed approach. Comparison between the experimental results and the numerical results demonstrates that the proposed approach is effective.Based on the above investigations on calibration of skeleton curves, hysterestic relationships of the axial and shear springs are respectively computed.Finally, some concluding remarks are made. Future research demands are discussed.