城市立交桥结构三维地震反应

Three - dimensional seismic response analysis of urban overpass structures

本文建立了城市立交桥结构地震破坏过程的分析模型，考虑了柱墩、梁、支座的单元模式，推导并建立了行波法输入下结构动力平衡方程，进而研究了地震多点输入下立义桥结构的地震反应问题，建立了立交桥结构的破坏准则，分别对几种方式地震输入下城市立交桥结构的地震反应问题进行了具体研究。从而为人们对实际立交桥结构在地震作用下的破坏过程有了更科学的认识：在对桥梁结构进行地震反应分析时，不应该忽略地震对它的多方面的影响。

In this paper, the analysis model of the urban overpass structure is proposed by considering the element models of column, beam and friction force at movable supports. The equilibrium equation under multi-joint excitations and the damage criterion of the overpass structure are established. Finally, the seismic response analysis of the urban overpass structure under multi-joint excitations is studied. The earthquake damage process is displayed and the analysis methods of urban overpass structure may be used for future studies.