ラーメン構造の耐震特性を考慮した変位制御型ワイヤブレース構造

摘要

This paper presents a new seismic resisting system for moment-resisting frames using wire-rope bracing. The braces used in this system can increase the lateral strength without reducing ductility of the moment frame. By delaying the bracing action, energy dissipation capacity is kept large and further the story-displacement can be reduced within a specified amplitude range. Comparison of the loading test results for the portal steel moment frames with and without the braces shows the fundamental characteristics of the proposed bracing system. Numerical response analyses are performed for the three-story moment-resisting frames with and without the bracing members. The analysis results reveal that the proposed wire-rope bracing system has a re-centering effect on the vibration center and a deformation dispersion effect along the height of the frame that can suppress deformation concentration into local stories.%近年発生した地震被害および将来発生が予想される地震災害を背 景に，建物の耐震性能の向上が急務とされている。建築構造形式の 1つであるラーメン構造は柱梁部材の曲げ変形により地震荷重に抵 抗する。