偏平な付帯柱を有する連層耐震壁の曲げ降伏後の靭性に関する実験的研究

抄録

The experimental study had shown that the final stages beyond flexural yielding of multistory shear walls (MSW) were mostly determined by compressive crushing of the columns and the panels. Therefore, the ratio (η_c) of compressive strength of the boundary columns to the compressive forces acting at the critical section under the yielding mechanism, was considered one of important factors to determine the deformation capacity of MSW. The five MSW specimens that were 1/4 scale models, showed lower 7 stories of a 11-story prototype building, and mainly focused on the effect of the ratio (η_c) on the deformation capacity were tested under reversing static loads. And the deformation behavior of MSW beyond flexural yielding was analytically investigated based on the test results. Major conclusions obtained from the investigations are as follows: (1) The ratio of the compressive strength of the boundary columns, to the axial force, definitely influences on the deformation capacity of MSW. (2) Beyond flexural yielding of MSW, there is a stable region of the deformation in which the deformation profiles along the height are uniform. In this stable region, MSW deform by rotational mechanism having the center of rotation at the base of the boundary columns under compression. (3) The drift angle Rt above the hinging region is nearly equal to the drift angle R_p and to the rotation θ_p at the top of the hinging region. However, this relation of R_i=R_p=θ_p disappears beyond the limit of the stable region of the deformation. So, the estimation of R_i in this region requires both θ_p and R_p.