Nonlinear 3D Solid Finite Element Analysis of RC Shear Wall Subassemblages under Lateral Loads

Kyung Ran HWANG and Han Seon LEE (Korea University, Korea)

This paper presents results of nonlinear 3D solid finite element analyses of a 2-, 3-, 5-, and 10-story RC shear wall subassemblage under lateral loads, and effects of the number of stories and the existence of slabs and coupling beams on the stiffness, strength, ductility, and failure mode are investigated. The following conclusions are drawn from analytical results: (1) The higher the number of stories, the lower initial stiffness and ductility the model has. By contrast, strengths are similar regardless of the number of stories. The damage and failure modes of all the models appear to be the combined mode of flexural and shear failure. (2) The effect of the existence of slabs on the initial stiffness and the strength is almost negligible, but the ductility of models with slabs is generally higher than that without slabs. Cracks and damages of the wall are not generally concentrated at the lower portion of the wall, but distributed over the significant range of the whole wall height regardless of the existence of slabs. Finally, (3) coupling beams are effective in increasing the initial stiffness and strength of models, but they do not improve the ductility capacity of models. Overturning moment resistance contributed by tension-compression coupling forces at the base accounts for approximately 30~40% of the total overturning moment capacity. This ratio does not change significantly with regard to the number of stories.

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