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基于多自由度空间体系地震响应分析的基本理论,得到大跨度桥梁的空间地震响应分析方法,并运用线弹性有限元理论将其程序化,分析过程包括桥梁有限元建模、地震动的选择、反应谱分析等。以袍江大桥——五跨钢管混凝土系杆拱桥为例,采用MIDAS/CIVIL有限元软件对该桥进行了动力特性分析,反应谱中采用CQC法,考虑三向地震作用,对其抗震性能进行了分析和评价,并提出增加横撑刚度和拱脚外包混凝土等措施增强结构抗震性能,该研究将为大跨度飞燕式钢管混凝土拱桥的抗震设计提供参考。
Based on the basic theory of seismic response analysis of multi-degree-of-freedom space system, the method of spatial seismic response analysis for long-span bridges is obtained. The program of linear elastic FEM is used to program the analysis of the bridge including finite element modeling of bridge, Response spectrum analysis. Taking Paojiang Bridge - Five Span CFST tied arch bridge as an example, the dynamic characteristics of the bridge were analyzed by using MIDAS / CIVIL finite element software. The CQC method was adopted in the response spectrum, considering the three-direction seismic action, its seismic performance Analyzes and evaluates it, and puts forward some measures to increase the seismic performance of the structure by increasing the stiffness of bracing and concrete encased by foot arch. This study will provide a reference for the seismic design of long - span fly - in CFST arch bridge.