極低降伏点鋼を用いた履歴型制震ダンパーの開発
本報では、建物の地震応答を制御する制震ダンパーとして、極低降伏点鋼を用いた4種類の形状のダンパーを新たに提案している。これらのダンパーの弾塑性加力実験によりダンパーの力学的性状を把握するとともに、ダンパーを設置した建物の地震応答解析を行い建物の地震応答性状ならびにダンパーの応答低減効果を検討している。その結果、本報で提案したダンパーは、小振幅から大変形にわたり安定した履歴性状およびエネルギー吸収能力を示し、建物の地震応答の低減に有効であることを明らかにしている。
Development of Low-yield-point Hysteretic Steel Dampers for Seismic Response Control
New types of steel dampers for controlling the earthquake response of structures have been developed. This paper reports on lateral loading tests of such dampers and the earthquake response analyses of structures combined with the dampers. The lateral loading tests were conducted using sub-structure frames containing the dampers. The specimens were subjected to incremental alternative lateral loads. Each specimen showed a stable load carrying capacity and a large inelastic energy absorption capacity. A series of elasto-plastic dynamic response analyses of frames were conducted using numerical models of the hysteresis characteristics of each type of damper. From the results, it has been cleared that the responses of the buildings to seismic activities can be reduced significantly by attaching the dampers.