Earthquakes and Structures

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Experimental and numerical investigation on the seismic behavior of the sector lead rubber damper

  • Xin Xu (School of Civil Engineering, Guangzhou University) ;
  • Yun Zhou (School of Civil Engineering, Guangzhou University) ;
  • Zhang Yan Chen (School of Civil Engineering, Guangzhou University) ;
  • Song Wang (School of Civil Engineering, Guangzhou University) ;
  • Ke Jiang (Department of Civil and Natural Resources Engineering, University of Canterbury)
  • Received : 2023.12.13
  • Accepted : 2024.01.29
  • Published : 2024.03.25
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Abstract

Beam-column joints in the frame structure are at high risk of brittle shear failure which would lead to significant residual deformation and even the collapse of the structure during an earthquake. In order to improve the damage issue and enhance the recoverability of the beam-column joints, a sector lead rubber damper (SLRD) has been developed. The SLRD can increase the bearing capacity and energy dissipation capacity, and also demonstrating recoverability of seismic performance following cyclic loading. In this paper, the hysteretic behavior of SLRD was experimentally investigated in terms of the regular hysteretic behavior, large deformation behavior and fatigue behavior. Furthermore, a parametric analysis was performed to study the influence of the primary design parameters on the hysteretic behavior of SLRD. The results show that SLRD resist the exerted loading through the shear capacity of both rubber parts coupled with the lead cores in the pre-yielding stage of lead cores. In the post-yielding phase, it is only the rubber parts of the SLRD that provide the shear capacity while the lead cores primarily dissipate the energy through shear deformation. The SLRD possesses a robust capacity for large deformation and can sustain hysteretic behavior when subjected to a loading rotation angle of 1/7 (equivalent to 200% shear strain of the rubber component). Furthermore, it demonstrates excellent fatigue resistance, with a degradation of critical behavior indices by no more than 15% in comparison to initial values even after 30 cycles. As for the designing practice of SLRD, it is recommended to adopt the double lead core scheme, along with a rubber material having the lowest possible shear modulus while meeting the desired bearing capacity and a thickness ratio of 0.4 to 0.5 for the thin steel plate.

Keywords

Acknowledgement

The authors would like to acknowledge the financial support provided by the National Natural Science Foundation of China (grant number 52178466), and Basic Innovation Program for graduate students of Guangzhou University (grant number 2017GDJC-D19). Also, a special appreciation goes to Heng Shui Zhen Tai Isolation Equipment Co., Ltd. for their support in the fabrication of the tested dampers.

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