【摘要】 为研究摩擦摆支座对网壳结构抗震性能的影响,本文分析摩擦摆支座的隔振机理,应用LS-DYNA有限元软件对摩擦摆支座进行实体建模,并验证该种建模方法的正确性。将静力作用下的铰支座和摩擦摆支座单层球面网壳的力学性能进行对比,结果表明应用摩擦摆支座使网壳结构的初始变形增大;在此基础上,对应用摩擦摆支座的单层球面网壳施加不同强度的地震动,从杆件轴力、节点加速度和节点相对位移三个方面对结构的动力响应特性进行分析,并讨论摩擦摆支座在单层球面网壳结构中的有效性和适应性,得到随着地震动强度的增加,轴力振动幅值减小的杆件数目及加速度和相对位移减小的节点数目也是增加的结论。最后,通过对最外环杆件截面加强,对应用摩擦摆支座的单层球面网壳同样进行地震响应分析,讨论外环杆件加强对结构抗震性能的影响。更多还原

【Abstract】 To study the effect of friction pendulum bearing(FPB) on seismic performance for reticulated shell structure,the solid model of FPB was established by the LS-DYNA finite element software.The vibration isolation mechanism of FPB was analyzed and the correctness of the model was verified.The mechanical properties of single-layer spherical lattice shell with FPB and hinged support were compared under the static condition.Results showed that application of FPB made the initial deformation of reticulated shell structure increase.On the basis,different ground motions were acted on the reticulated shell structure.The dynamic response characteristics of shell were analyzed in three aspects including axial force of bars,acceleration and relative displacement of nodes.The effectiveness and adaptability of FPB were verified.With the increase of earthquake intensity,the number of bars whose axial force reduced and the number of nodes whose acceleration and relative displacement reduced were increased.Finally,seismic response of single layer spherical latticed shells with outer strengthened ring bars was researched and the effect of outer strengthened ring bars on the structural seismic performance was discussed.更多还原