【摘要】 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。为了提高网壳结构的抗震性能,可采用支座型隔震装置形成分段式多维隔震机制。在这类多维隔震体系中,碟形弹簧支座可用于结构的竖向隔震,同时,可将其与适用于水平隔震的摩擦摆(FPS)或SMA-橡胶支座配合使用。基于上述概念设计,提出了水平和竖向隔震装置的构造和计算模型。进而,根据网壳结构多维隔震的动力方程,开展了El Centro波作用下双层球面网壳和单层球面网壳结构多维隔震控制的数值模拟。计算结果表明,多维隔震球面网壳结构的杆件内力、加速度和位移的减振效果能达到50%以上,验证了所提多维隔震技术对保护球面网壳结构免遭地震破坏的有效性。更多还原

【Abstract】 Spherical lattice shell is a typical long-span space structure and its seismic response is evidently influenced by horizontal and vertical components of ground motion.Bearing-type isolation devices can be utilized to form a segmented multidimensional isolation mechanism to improve the seismic performance of the spherical lattice shell structures.In such structures,disc spring bearings can be introduced to constitute a vertical isolation system and cooperate with two types of horizontal isolation device:(1)the friction pendulum system(FPS) bearings;(2)the SMA-rubber bearings.Based on conceptual design mentioned above,the configuration plans of the vertical and horizontal isolation bearing were developed,and the corresponding calculation models were established.According to dynamic equations for the lattice shell structures with multidimensional seismic isolation system,seismic analysis was executed for both double-layer and single-layer spherical lattice shell under El Centro wave.The numerical simulation results show that the vibration-reduction effectiveness of the internal force,acceleration and displacement of such seismically isolated structures is up to 50% or more.Therefore,the presented multidimensional isolation technology can be effectively used to protect the spherical lattice shell structures from damages of earthquake.更多还原