Wall-Slab-Gravity Columns Interaction in Multi-Storey Shear Wall Buildings

Abstract eng:
In multi-story shear wall buildings with gravity columns and slabs, structural walls serve as the main lateral force resisting elements while frames are designed to resist only gravity loads which will have to ensure deformation compatibility with the lateral resisting system. It is common practice to assess the seismic performance of a whole structural system based on the seismic behavior of isolated structural walls mainly because slabs and gravity columns have low elastic lateral stiffness compared to structural walls and conducting 3D analysis of shear wall building system with floor slab and gravity system is tedious and demanding. This study aims to investigate the effect of strength and stiffness of slabs on seismic performance of the whole system and the structural wall itself. A parametric study with varying out-of-plane bending stiffness of slabs around the structural walls is conducted to assess the contribution of the slab-wall-gravity column interaction in the overall response of the whole system. These results demonstrate that concrete slabs increase the lateral strength of multi-storey shear wall buildings. However, this increase in lateral strength of the whole system is equivalent to the increase in shear forces on structural walls which may affect their failure modes or drift capacity.

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