著者

吉敷 祥一 高山 大 山田 哲 エネ ディアナ 小西 克尚 川村 典久 寺嶋 正雄

出版者

Architectural Institute of Japan

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.77, no.680, pp.1579-1588, 2012

被引用文献数

6

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Evaluation of bi-directional characteristics of base-isolation devices is a very important issue for base-isolated structures. This paper describes a bi-directional loading test of U-shaped steel dampers widely-used for energy dissipation in base-isolated structures. The major findings obtained from the test are as follows: (1) torsion-induced residual deformation leads to contact with damper connections; (2) evaluation method of cyclic deformation capacity, which divides bi-directional orbit into deformations in 0 and 90 degree, is proposed and the validity is verified; (3) cyclic deformation capacity is reduced by cumulative torsion; (4) two indices <i>J_c</i> and <i>J_f</i> proposed in this paper can evaluate the limitation of cumulative torsion until contact with connections and the tendency of torsioninduced reduction of cyclic deformation capacity.