- 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
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<sub>c</sub></i> and <i>J<sub>f</sub></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.