Numerical and experimental study of mechanical behaviors of the steel-confined rubber bearing

作者：Wu, Di; Xiong, Yan; Yang, Zhenyu^*

来源：CONSTRUCTION AND BUILDING MATERIALS, 2022, 352: 128900.

DOI：10.1016/j.conbuildmat.2022.128900

• Steel-confined
• Three-dimensional seismic isolation
• Isolator
• Rubber bearing
• Quasi-static test

The conventional laminated rubber bearing is primarily for the horizontal seismic input. To achieve three-dimensional seismic isolation, the horizontal laminated steel plates in rubber bearings are replaced by externally confined steel plates, which is the steel-confined rubber bearing (SCRB). The external steel cover effectively increases the stability of the rubber bearing, while acting as a U-shaped steel cover and improving the energy dissipation capacity of the isolator. The mechanical properties of the SCRBs were investigated based on finite element analysis and experiments. The test and numerical results show that the SCRB has a low horizontal and vertical stiffness, while the external steel cover provides additional damping for the rubber isolator. The modified Bouc-Wen model was introduced to simulate the horizontal and vertical force-displacement hysteresis relationship of the SCRB. Based on FE model simulations, the effects of area coverage, quantity and length of steel cover on vertical stiffness, horizontal stiffness and equivalent damping ratio of the SCRB were analyzed in detail. A design procedure of the SCRB based on the stiffness is proposed. Finally, the effectiveness of the SCRB on reducing horizontal and vertical seismic responses is validated using a single-degree-of-freedom system.

• 单位
  test; TEST; 广州大学