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球面网壳结构是典型的大跨度空间结构,地震时水平和竖向地面运动分量对其地震响应的影响均十分显著。为了提高其抗震性能,采用SMA—橡胶支座和碟形弹簧形成分段隔震机制以降低结构的多维地震响应。本文建立了SMA—橡胶支座和碟形弹簧的隔震计算模型。进而,根据球面网壳结构多维隔震的动力方程,针对某单层球面网壳结构,开展了其在不同地震作用下的多维隔震控制研究。由时程响应的数值模拟结果可见,多维隔震网壳结构的杆件内力、加速度响应和位移响应较无控结构有了显著的降低,从而验证了所提出的多维隔震技术对于保护球面网壳结构免遭地震灾害破坏的有效性。
Spherical reticulated shell structure is a typical large-span spatial structure, and the influence of horizontal and vertical ground motion components on the seismic response is very significant. In order to improve its seismic performance, the SMA-rubber bearing and disc spring are used to form the sectional isolation mechanism to reduce the multi-dimensional seismic response of the structure. This paper established a SMA-rubber bearing and disc spring isolation calculation model. Furthermore, according to the dynamic equation of the multi-dimensional isolation of the spherical reticulated shell, aiming at the single-layer spherical reticulated shell structure, the multi-dimensional seismic isolation control under different earthquakes is carried out. From the numerical simulation of time-history response, it can be seen that the internal force, acceleration response and displacement response of the multi-dimensional isolated reticulated shell have a significant reduction compared with the uncontrolled structure, which verifies that the proposed multi-dimensional seismic isolation technology is effective in protecting the spherical net Effectiveness of the shell structure from being destroyed by the earthquake disaster.