Research On Seismic Behavior Of High Redundant Shear Walls With Concealed Bracings

Reinforced concrete (RC) shear walls are widely recognized for providing adequate lateral load resistance and drift control for multi-story, high-rise and super high-rise buildings. In recent years, the theory of redundancy gained wide attention in many fields, especially after the“9-11”event. For example, some researchers attempted to set energy dissipation parts to increase the redundancy of RC shear-wall, which separated the energy dissipation structure from the main structure. However, there has been little study to increase redundancy by combining two deferent systems of shear-walls. In this study, the redundancy in a new type of high-redundancy RC shear-wall was studied in this paper. This high-redundancy RC shear-wall involved the wall-frame and shear walls with concealed bracings.In this paper, two specimens with different aspect ratio of 0.67 and 1.22 were tested under low reverse cyclic loads. The main research objective was to establish the cyclic behavior of the walls including failure pattern, ultimate capacity, stiffness degradation, strength degradation, and deformation capacity.A finite element model was developed by ABAQUS to simulate the whole process of the experimentation. Compared with the results of the tests, a suitable numerical model for the high-redundant RC shear walls was developed for the lateral simulation studies.A further numerical simulation had been performed with the above model, which was on the basis of the theory of performance seismic design to predict the remaining resisting ability of it when one of the resist systems was almost out of work.The results of this paper have enriched the research on redundancy RC shear-wall, and provided reference data for the future research on this kind of shear-wall.