桩-土-结构相互作用下新型抗拔摩擦摆支座对单层柱面网壳结构地震响应的影响

来源期刊:中南大学学报(自然科学版)2016年第3期

论文作者:刘毅 薛素铎 潘克君 李雄彦

文章页码:967 - 977

关键词:单层柱面网壳结构;桩-土-结构相互作用;竖向抗拔摩擦摆支座;地震响应;入射角度

Key words:single-layer cylindrical reticulated shell; pile-soil-structure interaction; vertical anti-uplift friction pendulum bearing; seismic response; incident angle isolation

摘    要:基于设计提出的铜基面抗拔摩擦摆支座(FPB)试验研究和数值模拟,将铜基面抗拔摩擦摆支座以双线性模型简化,并结合桩-土-结构相互作用(PSSI)、黏弹性人工边界相关理论,采用整体有限元法建立桩-土-结构相互作用的隔震(PSSII) 单层柱面网壳结构模型,研究桩-土-结构相互作用下铜基面抗拔摩擦摆支座对网壳结构地震响应的影响及地震波输入的空间效应问题。研究结果表明:铜基面抗拔摩擦摆支座使桩-土-结构作用下的网壳结构的节点加速度峰值衰减50%~60%,网壳杆件的内力衰减50%~80%,地震波频谱特性对抗拔摩擦摆支座的隔震效应有着不可忽略的影响;PSSII体系网壳节点加速度最大值未必在地震波垂直入射时最大,入射角度45°~60°是一重要的考虑区间;当地震波入射角度为55°~80°时,在进行抗震计算时可按国家标准规定进行地震波输入,当不在此范围时,不宜按照规范规定进行地震波输入,应考虑地震波的空间效应。

Abstract: Based on the numerical and experimental study of a new type friction pendulum bearing (FPB) with stainless steel interfaces and anti-uplift device, the new bearing was simplified with the bilinear model. A single-layer cylindrical reticulated shell model was established in consideration of the pile-soil-structure interaction and isolation (PSSII) by integral finite element method combined with theories of pile-soil-structure interaction and viscoelastic boundary. The new bearing impacts on the seismic response of single-layer cylindrical reticulated shell were discussed, as well as the spatial effect of input seismic wave. The results show that the nodal peak acceleration of the shell decrease by 50%-60%, and the internal force of the structural members decrease by 50%-80%. The effect of spectrum characteristics of seismic wave on the isolation effects of the new bearings cannot be ignored. The peak acceleration of the PSSII systemmay not appear at the maximum value in the vertical incident of the seismic wave, and the incident angle 45°-60° is an important range which should be considered carefully. The national standard should be followed in seismic calculation when the incident angle of seismic wave is between 55° and 80°. On the other hand, the code should not be followed, and the spatial effect of seismic wave should be considered independently.

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