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利用推导的黏弹性边界的等价形式处理土对结构的影响,分别采用时程分析、虚拟激励法计算结构的响应与内力。通过分析发现,由于苏通桥桩长,考虑土-结构相互作用后,结构整体刚度明显变小,其自振周期变长,结构位移明显比不考虑相互作用时增加。桩-土相互作用的存在使上部结构内力减小;相对于承台固结模型,考虑桩-土-结构相互作用使结构位移增大;与此同时主塔塔底、辅助墩及过渡墩墩底的剪力、弯矩减小,因此桩基础是控制抗震设计最关键的地方之一;鉴于地震波的输入组合对结构响应影响较为明显,在抗震设计时,需多工况输入组合求出地震作用下内力与位移的最大值组合才能保障结构的安全可靠。
The effect of soil on the structure is treated by the equivalent form of the derived viscoelastic boundary. Time-history analysis and virtual excitation method are used to calculate the response and internal force of the structure respectively. Through the analysis, it is found that due to the pile length of the Sutong Bridge, considering the soil-structure interaction, the overall stiffness of the structure becomes smaller obviously and the period of natural vibration becomes longer, and the displacement of the structure obviously increases than that without considering the interaction. The internal forces of the superstructure decrease due to the pile-soil interaction. The displacement of the structure is increased by considering the interaction of pile-soil-structure with respect to the consolidation model of the cap. At the same time, the bottom of the tower, the auxiliary pier and the transitional piers Therefore, the pile foundation is one of the most critical parts in the control of aseismatic design. In view of the obvious influence of the seismic wave input combination on the structural response, in earthquake-resistant design, it is necessary to input and combine multiple working conditions to find the earthquake Under the action of the maximum combination of internal force and displacement in order to protect the structure of safe and reliable.