论文部分内容阅读
通过对基础隔震的单层柱面网壳缩尺模型进行正弦波扫频和多组实际地震波激励的振动台试验,系统研究了水平地震作用下HDR支座的隔震性能.分别测试了无隔震网壳和基础隔震网壳模型的动力特性、一致激励和行波激励下结构的加速度、位移及杆件应变等动力响应,分析了行波效应对隔震大跨网壳屋盖地震响应的影响.试验结果表明:HDR支座基础隔震有效延长大跨网壳结构的自振周期,大幅度降低隔震层以上结构地震响应,隔震后上部结构的运动趋于同步;行波激励下,结构地震响应沿地震波传播方向相对逐渐增大,地震波传出端附近的隔震支座剪切变形明显增大,按一致激励设计偏于不安全.
The seismic isolation performance of HDR bearing under horizontal earthquake is studied systematically by shaking table test of single-layer cylindrical reticulated shell scale model with sine wave and multiple sets of actual seismic wave excitation. The dynamic characteristics of the isolated shell and the base isolated shell model, the dynamic response of the structure under constant excitation and traveling wave excitation, the displacement and the strain of the rod are analyzed. The effects of traveling wave on the seismic response of the long- The experimental results show that the base isolation of HDR bearings effectively prolongs the natural period of the large-span reticulated shell structure and greatly reduces the seismic response of the superstructure above the isolation layer. The movement of superstructure tends to be synchronized after isolation. Under the excitation, the seismic response of the structure increases along the propagation direction of the seismic waves, and the shear deformation of the isolated bearings near the outgoing end of the seismic waves obviously increases. As a result, the uniform excitation design is unsafe.