Base-isolated steel structure with spring limiters under near-fault earthquakes: Experiment

Miao Han, Yuandong Wang, Hongkai Du, Xiangyang Chu, Mingzhu Cui and Lingshuai Meng

Abstract

The seismic performance of a steel frame base-isolated structure with steel spiral spring limiters is experimentally investigated under near-fault ground motions. A series of shake table simulator tests are carried out to analyze the dynamic response of isolation layer and superstructure. The test setup consists of a one-eighth scale five-story steel frame with steel spiral spring limiters that are designed and modeled in different parameters and stiffness, as well as various reserved gap sizes between the testing structure and limiters. The main output parameters are the maximum deformation at the isolation level, the maximum vertical force of isolation bearings, and inter-story drift. The results further reveal the seismic impact on the isolation layer and superstructure dynamic response caused by the limiter stiffness and reserved gap size.

Key Words

base isolation; base limiter; near-fault ground motions; shake table tests; vibration mode

Address

Miao Han: Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing, China Yuandong Wang: The Dennis Group, Salt Lake City, U.S.A. Hongkai Du: Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing, China/ Department of Civil and Environmental Engineering, University of Utah, Salt Lake City, U.S.A. Xiangyang Chu: Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing, China Mingzhu Cui: Hefei University of Technology, Anhui, China Lingshuai Meng: China State Decoration Group Co. Ltd., Beijing, China

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