中文摘要：

以上覆土层为60m的主跨为85m，采用桩承墩基的钢管混凝土拱桥为分析对象，建立三维有限元模型．地基土采用服从Drucker-prager屈服准则的弹塑性模型，并且采用接触对方法模拟土与桩侧面的相互作用，分析了考虑土与结构动力相互作用效应的拱桥地震反应，并与不考虑相互作用的拱桥地震反应作了对比，发现动力相互作用对横桥向反应影响很大．

英文摘要：

Three-dimensional finite element analysis in time domain for dynamic soil pile interaction of CFST （concrete filled steel tube） arch bridge with a main span of 85 m and pile draft foundation was carried out. The elasticplastic model of soil was cosidered to follow Drucker-prager yield criterion, and contact pair approach to simulate pile-soil interaction was adopted. The seismic response of CFST bridge analysis result considering soil-structure interaction was compared with that of without considering such interaction. It is obvious that the lateral response is bigger than its longitudinal response with considering SSI effect.