Earthquakes and Structures

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Dynamic loading tests and analytical modeling for high-damping rubber bearings

  • Kyeonghoon Park (Department of Civil Engineering, Kyushu University) ;
  • Taiji Mazda (Department of Civil Engineering, Kyushu University) ;
  • Yukihide Kajita (Department of Civil Engineering, Kyushu University)
  • Received : 2023.05.15
  • Accepted : 2023.08.14
  • Published : 2023.09.25
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Abstract

High-damping rubber bearings (HDRB) are commonly used as seismic isolation devices to protect civil engineering structures from earthquakes. However, the nonlinear hysteresis characteristics of the HDRB, such as their dependence on material properties and hardening phenomena, make predicting their behavior during earthquakes difficult. This study proposes a hysteretic model that can accurately predicts the behavior of shear deformation considering the nonlinearity when designing the seismic isolation structures using HDR bearings. To model the hysteretic characteristics of the HDR, dynamic loading tests were performed by applying sinusoidal and random waves on scaled-down specimens. The test results show that the nonlinear characteristics of the HDR strongly correlate with the shear strain experienced in the past. Furthermore, when shear deformation occurred above a certain level, the hardening phenomenon, wherein the stiffness increased rapidly, was confirmed. Based on the experimental results, the dynamic characteristics of the HDR, equivalent stiffness, equivalent damping ratio, and strain energy were quantitatively evaluated and analyzed. In this study, an improved bilinear HDR model that can reproduce the dependence on shear deformation and hardening phenomena was developed. Additionally, by proposing an objective parameter-setting procedure based on the experimental results, the model was devised such that similar parameters could be set by anyone. Further, an actual dynamic analysis could be performed by modeling with minimal parameters. The proposed model corresponded with the experimental results and successfully reproduced the mechanical characteristics evaluated from experimental results within an error margin of 10%.

Keywords

Acknowledgement

This research is part of the results of research conducted in collaboration with the HDR Study Group (Kawakin CoreTech Co., Ltd., Sumitomo Riko Co., Ltd., NIPPON CHUZO.K.K., Bridgestone Corporation, The Yokohama Rubber Co., Ltd.). This research was supported by the JST SPRING (Grant No. JPMJSP2136).

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