A New Approach for Seismic Design of the Asymmetric Shear Wall Concrete Buildings Located Within Near-Fault Ground Motions

摘要

Near-fault ground motions impose large demands on structures compared to far-fault ground motions. Most seismic codes of the world provide design guidelines for strength distribution based on the traditional conception that the element stiffness and strength are independent parameter. Recent studies have pointed out that the stiffness and strength of the ductile RC structural walls are dependent parameters. A realistic modeling of the non-linear ductile behavior of the RC walls is considered in combination with the characteristics of the dynamic torsional response of asymmetric buildings. Based on the proposed approach, the strength assigned between the resisting elements. Minimum torsional response in one-storey and multi-storey under near-fault and far-fault ground motions are determined. It is shown that under near-fault ground motion, structural systems with the stiffness center and the strength center located on the opposite sides of the mass center will have minimum torsional response. While the structure subjected to far-fault ground motion, according to the codes provisions, stiffness eccentricity would dominate parameter in evaluation of the minimum torsional response. A new displacement-base design method by considering criteria such as characteristics of the dynamic torsional response, the ductility of the RC walls, the system ductility and the story-drift at the softer edge of the building under the design earthquake are exhibited. With respect to the displacement profile, post yield displacement and curvature ductility factor of elements are defined. Therefore, confinement of concrete in boundary would control.