Seismic Behavior of Flanged Reinforced Concrete Shear Walls under Cyclic Loading

摘要

Five large-scale flanged reinforced concrete shear walls, includingfour T-shaped walls and one L-shaped wall, were tested underuniaxial and biaxial cyclic loading. The objectives o f the tests wereto provide insight into the failure mechanism and seismic behavioro f unsymmetrical shear walls, and to investigate the influence o floading procedure, detailing o f boundary elements, and sectionshape on the cyclic response o f the walls. All the specimens expertenceda flexure-dominant failure with the damage concentrated at thefree end o f the web. Test results showed that higher bearing capacityand stiffness but significant stiffness and strength degradations wereobserved for the case with the flange in tension, whereas betterenergy dissipation capacity and deformation capacity were achievedfor the case with the flange in compression. The failure mechanismsuggested that special boundary element could be omitted at theweb- flange intersection, and optimal design should be conducted forthe boundary element o f the web opposite the flange.