周期地動を受ける梁降伏型平面骨組の動的崩壊

概要

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The symmetry limit analysis performed by the present senior author predicted that an unknown type of collapse behavior characterized by cyclic growth of a bow-shaped overall deflection mode is possible to occur in multistory multibay weak-beam planar frames subjected to statically repeated top horizontal displacement, if the column axial compressive force is larger than a certain limit. In this paper, the dynamic collapse behavior of weak-beam planar frames subjected to cyclic ground motion is investigated by an exact numerical response analysis. The results will show that under constant axial loads in excess of the symmetry limit, a bow-shaped deflection mode can appear and grow with gradually increasing overall sway, and that generation of plastic hinges in columns due to the growth of the bow-shaped mode induces a very severe deteriorating behavior.
社団法人日本建築学会の論文
1995-08-30