Hysteretic behavior of high damping rubber bearings under multiaxial excitation. Issue 163 (December 2022)

• Record Type: Journal Article
• Authors: Li, Tao; Yang, Yijian; Xu, Jun; Dai, Kaoshan; Ge, Qingzi; Wang, Jianze; Chen, Peng; Wang, Bin; Huang, Zhenhua
• Is Part Of: Soil dynamics and earthquake engineering. Issue 163(2022)
• Publication Date: 2022-12
• Subjects: Seismic isolation -- High damping rubber bearings -- Six-degree-of-freedom -- Quasi-static test -- Hysteretic behavior -- Coupling effect; Soil dynamics -- Periodicals; Earthquake engineering -- Periodicals; Sols -- Dynamique -- Périodiques; Génie parasismique -- Périodiques; 624.176205
• DOI: 10.1016/j.soildyn.2022.107549
• Languages: English
• ISSNs: 0267-7261

Abstract

Abstract: The high damping rubber bearing (HDRB) is an advanced seismic isolation component currently used in building structures with excellent energy dissipation capacity. To explore a deeper understanding of the HDRBs' performance and effectiveness, a series of six-degree-of-freedom (6DOF) quasi-static tests were designed and conducted on three HDRB specimens with different dimensions. The main purposes of the tests are to reveal the hysteresis characteristics of the bearings in the rotational degrees of freedom, and to assess the influence of axial pressure and multiaxial coupling effect on the horizontal performance of the HDRBs. During the tests, the rotational, unidirectional, and bidirectional horizontal (coupled and uncoupled) hysteretic responses were obtained. Additionally, several important mechanical parameters are recommended and calculated to evaluate the coupling effect of axial load and rotation on HDRB performance. The results indicate that the axial pressure has a significant impact on the horizontal performance, while the effect of coupling the rotational degrees of freedom is not obvious. In addition, the tests also observed a significant level of stiffness degradation in the horizontal directions after multiple loading cycles. Highlights: The hysteretic behavior of the HDRBs in the rotational degrees of freedom is revealed. Axial pressure has significant influence on horizontal and rotational hysteretic performances of HDRBs. HDRBs show obvious stiffness degradation after cyclic loading tests.