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提出了考虑桩-土-结构动力相互作用的输电塔地震反应分析方法。通过采用粘弹性人工边界模拟土体边界,用改进的Goodman单元模拟桩-土接触面,建立了桩-土-输电塔体系相互作用模型。以一具体输电塔为例,在四种不同的场地条件下,对桩-土-输电塔体系在地震作用下的动力反应进行分析,并与不考虑桩-土-结构动力相互作用的计算结果进行对比。结果表明:在软土及中软场地,考虑相互作用计算出的塔体位移和构件应力均大于不考虑相互作用的计算结果;在中硬及硬土场地,二者区别不大。建议在软土和中软场地,进行输电塔抗震设计应充分考虑桩-土-结构的动力相互作用。
A seismic response analysis method of transmission tower considering the pile-soil-structure dynamic interaction is proposed. By using the viscoelastic artificial boundary to simulate the soil boundary and modeling the pile-soil contact surface with a modified Goodman element, an interaction model of the pile-soil-transmission tower system is established. Take a concrete transmission tower as an example, the dynamic response of the pile-soil-power transmission tower system under earthquake action is analyzed under four different site conditions, and compared with the results without considering the pile-soil-structure dynamic interaction comparing. The results show that in both soft and medium soft sites, the displacement and the component stress of the tower calculated by considering the interaction are larger than those without considering the interaction. In the medium and the hard site, the difference between the two is not obvious. It is suggested that the dynamic interaction of pile-soil-structure should be fully considered in the seismic design of transmission towers in both soft and medium soft areas.