抄録
The steel plate shear wall is the one of the seismic resistance devices which is installed in the frame of building to improve the horizontal stiffness and strength. Shear force is loaded on the steel plate shear wall when the horizontal force acts the building. In order to prevent the overall buckling, some stiffeners are welded on the shear wall in front and back cross arrangement. Therefore, the design of stiffeners is very important to prevent strength deterioration and to maintain restoring force characteristics.
Authors have proposed the new design method of the stiffeners arranged in front and back crossing of the steel plate shear wall. The purpose of this study is to directly estimate plastic buckling strength and plastic deformation capacity by using the width-thickness ratio β generalized by yield strength and elastic buckling coefficient. The estimation formula of the buckling characteristic has been established based on the results of FEM analysis, and three target performance have been classified based on the width-thickness ratio β. Their validities have been confirmed by loading tests of basic square specimens. In addition, as an example, the necessary flexural rigidity has been calculated for each target performance.
Results are summarized as follows:
1) The plastic buckling strength has linear relation with the width-thickness ratio β. The relationship between plastic buckling strength and β is formulated by linear function.
2) The relationship between plastic deformation capacity and β is formulated based on the minimum value of the results of FEM analysis. The proposed estimation formula can evaluate the plastic deformation capacity conservatively.
3) In the loading tests, it has been confirmed that the performance of specimens was higher than the target performance which evaluated by the estimation formula.
4) The necessary flexural rigidity can be calculated depending on the material strength and the target performance. The stiffeners can be designed more rationally than previous design method.
