原田 幸博

In many previous studies, it has been already indicated that maximum deformation of building under strong earthquake is affected by instantaneous energy input of ground motion. The purpose of the present study is to investigate whether damage distribution in multi-story moment frame induced by strong earthquake is affected by magnitude of instantaneous energy input. In this study, real and simulated earthquake records are adopted as input ground motion for the response analysis. The results of response analyses prove that the effect on damage concentration in multi-story moment frame by instantaneous energy input is negligibly small.

The strength and local rotational stiffness of the beam-to-column connection reinforced by increasing column thickness without any diaphragms are presented. The column thickness at the beam-to-column connection area is increased partially by the induction heating process. The structural behaviors of the beam-to-column connection of this type are investigated experimentally and compared with those of the connection with inner diaphragms by the cyclic reversal loading tests of the beam-and-column subassemblage specimens. Also, the elasto-plastic behaviors of the beam-and-column subassemblages and each element are analyzed by the finite clement analysis. The local full plastic and ultimate strength of the beam-to-column connection is evaluated by the yield line theory taking account of the area of the increasing column thickness