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Effectiveness of an eccentric rolling isolation system with friction damping

2011; SAGE Publishing; Volume: 18; Issue: 14 Linguagem: Inglês

10.1177/1077546311428633

1741-2986

Cho‐Yen Yang, Cheng-Hsin Hsieh, Lap-Loi Chung, Hung-Ming Chen, Lai‐Yun Wu,

Vibration and Dynamic Analysis

Recently, the benefit of nonlinear isolation systems under resonance or near-fault earthquake has been investigated. In this paper, an eccentric rolling isolation system (ERIS) with additional friction damping is proposed. The isolation object is eccentrically pinned on a set of circular isolators so that the restoring force is nonlinear. To investigate the advantage of the ERIS, a corresponding isolation system with linear restoring force is also considered for comparison. The friction parameters of the two systems with linear and nonlinear restoring force are designed under the far-field El Centro earthquake. The performances of the two isolation systems are inspected under excitations other than the design one. In free vibration, the response of the ERIS decays faster than the corresponding linear system. In resonance sinusoidal excitation, the responses are divergent for the linear system but convergent for the ERIS. The linear system is ineffective but the ERIS is effective due to the nonlinearity under the near-fault Chi-Chi earthquake with various peak ground accelerations.