Elasto plastic Analysis of Reinforced Concrete Shear Walls Based on Cyclic Soften Membrane Model

Abstract:

The reinforced concrete (RC) shear wall and composite shear wall is one of the predominant structural components used extensively in high rise buildings to resist lateral loads induced by earthquakes. How to simulate the hysteretic behavior of RC shear walls effectively under earthquakes is one of the key issues of seismic performance evaluation of high rise buildings. According to the features of elasto plastic responses of RC shear walls, several analytical models which could be classified into two groups, microscopic models and macroscopic models, were developed for RC shear walls. The theory of cyclic soften membrane model (CSMM) was introduced. Based on this theory, the modeling procedures for different kinds of shear walls were presented by using OpenSees program. The models were validated by comparing the calculated responses with the experimental results of 11 isolated walls with different failure modes and various steel encased profiles under cyclic loadings. Numerical simulation results indicate that such analytical method can predict effectively the global and local inelastic behavior (such as overall hysteretic behavior and local material strain) of the wall system, and it provides a reference to seismic performance assessment of high rise buildings.

Key words:cyclic soften membrane model; reinforced concrete shear wall; steel concealed truss concrete composite shear walls; steel plate reinforced concrete composite shear walls; seismic performance