座屈拘束ブレース接合部の必要耐力に関する一考察: 芯材を建築構造用圧延鋼材とした場合

摘要

地震等による構造物の応答を制御することを目的として，エネルギー吸収要素であるダンパーは活用されており,鋼材の塑性変形能力を活用した鋼材ダンパーはその一つである。鑭材ダンパーの一つである座屈拘束ブレースは，ダンパー塑性化部位（以下，ダンパー芯材）の軸方向変形で地震エネルギーを吸収する制振デバイスである。%To ensure the structural behavior of the passive controlled structure, where buckling-restrained braces (BRB) are installed in the system, the BRB connection must have sufficient strength. In this paper, required strength at the BRB connections are investigated based on testing and numerical simulation. Cyclic loading test are conducted to clarify the strain-hardening behavior of the rolled steels for building structures; the relationship between material properties and strain-hardening are investigated. To simulate the dispersion of the strength at plastic region, Monte-Carlo simulation is carried out. Average stress and standard deviation are calculated from this simulation. Finally, required strength at the BRB connection is proposed based on statistics.