Structural deformation control under earthquakes has been conducted recently by connecting steel shear walls or steel wall-type dampers with steel frames. The steel shear walls or steel wall-type dampers provided with proper rib-plates exhibit high ultimate strength and plenty of plastic deformations following shear buckling of the walls. We analyze numerically elastic-plastic behaviors of the steel shear walls and steel wall-type dampers using the FEM program. In the analyses, 400Mpa-grade and 100Mpa-grade steels are adopted, and various divisions by the rib-plates for the walls are considered. From the analytical results, we propose a design formula for obtaining the required rigidity of the rib-plates to ensure that the steel shear walls and steel wall-type dampers would have enough elastic stiffness and ultimate strength according to their materials
