丸鋼芯材を二重鋼管により座屈拘束したブレースに関する実験的研究

摘要

This paper presents an experimental study on the budding-restrained brace (BRB), in which round steel bars and double steel tubes are employed for core members and buckling-restraining members, respectively. The inner tube restrains buckling of the core members directly and the outer tube restrains buckling of the inner tube through the spacers. The core member of round steel is divided into two bars, and they are connected with a central coupler. The outer tube is connected to the central coupler by welding for preventing the outer tube from falling by self-weight. This bracing system has plural contraction allowance parts permitting the plasticity contraction of the core member. The authors carried out the element tests of the core member, and also carried out the full-scale cyclic loading tests of the brace. The test results revealed that the proposed BRB has sufficient capability as a hysteretic damper under the control of the compressive axial force by the number of contraction allowance parts and the fixing methods of inner tubes.%地震エネルギーを吸収し制振効果を発揮する部材の一つとして座屈rn拘束ブレースがあり，これまでに様々なものが開発され実用化されrnている。既存の座屈拘束ブレースは芯材に鋼板や鋼管を用いて高いrn軸力に対応した座屈拘束ブレースが多く，それらは主に高層建築物rn等の大規模建築に用いられ，中低層建築物における制振構造の適用rnは少ない。