降伏点強度の偏心による建物のねじれ振動に関する研究(その2) : 弾塑性応答解析結果 : 静的偏心距離が零の場合

Abstract

The torsional vibration is exited by the eccentricity of the mass, the stiffness and the yield strength of the earthquake resistant elements. In this paper, when the eccentricity exits for the yield strength of the earthquake resistant elements, the torsional vibration is evaluated by the dynamic eccentricity ratio and the ductility factor. For the analytical, the static eccentricity ratio in relation to the mass and the stiffness is zero. Accordingly the torsional vibration which is treated in this paper, is all occurred by the eccentricity of the yield strength. From the results of the elasto-plastic response analysis, it is clear that the dynamic eccentricity ratio and the ductility factor strongly depend on the eccentricity of the yield strength. For the another parameters, the both side stiffness ratio η of the earthquake resistant element affects considerably the dynamic eccentricity ratio, but does not affect the ductility factor. The ratio of the building plane shape, β does not hardly affect the dynamic eccentricity ratio and the ductility factor. And it is clear that the influence of the earthquake resistant elements for the perpendicular direction, η_p affects considerably the dynamic eccentricity ratio within the range which the eccentricity of the yield strength is large, but does not hardly the affect the ductility factor.