软着陆保护橡胶支座隔震体系振动台试验研究与比较

Shaking table test and comparison of rubber bearing isolation system with soft landing protection

本文对一基础隔震模型进行了软着陆保护振动台模拟地震动试验,展示了该隔震体系在发生水平向大变形条件下,在不同后备支座以及滑移面摩擦系数不同情况下,轴压力从承载支座向后备支座转移的情况。结果表明:软着陆隔震保护体系不仅保护了承载支座免遭大变形失稳破坏,同时还能提供摩擦阻尼,将隔震层位移和上部结构层间位移控制在允许范围内。文中对隔震层位移、上部结构最大层间位移及绝对加速度等进行了分析,所得理论曲线与试验拟合曲线吻合较好。具有很大的应用前景。

In this paper, a shaking table model test of the soft landing protection of base isolation is completed. Under the condition of large lateral deformation, the features of the axial pressure conveying from the loaded rubber bearings to the back up supports by shaking - table test under different conditions of back up supports and friction coefficients are illustrated. The results show that the back up support not only prevents the loaded bearing from instable failure caused by large deformation but also provides friction damping and exerts better effect on the aspect of reducing horizontal displacement of isolation layer. At the same time, the isolation layer displacements, the maximum acceleration responses and story drifts etc of the superstructure are also discussed in this paper. The theoretical and experimental curves figured out are closely coincident with each other.