基于时变和动力耦合效应的钢管混凝土拱桥稳定性能研究

Research on stability performance of concrete-filled steel tubular arch bridge based on time-varying and dynamic coupling effects

随着我国桥梁事业的不断发展,桥梁建设技术的持续进步,钢管混凝土拱桥的跨度也在不断突破,其恒载的百分比也随之增加。钢管混凝土拱桥作为一种受压弯曲结构,拱的稳定性问题越来越突出。然而,结构的动态稳定性不同于静态稳定性,由于时间参数的引入使得结构的稳定性更加复杂。因此,本文以跨径布置为30m+80m+30m的永宁江2号钢管混凝土拱桥为依托工程,建立全桥有限元分析模型,针对钢管混凝土拱桥的动力稳定性问题,分别从活载、含钢率、矢跨比三个方面进行研究。本文可为类似桥型的稳定性问题研究提供一定的参考。

With the continuous development of my country’s bridge industry and the continuous progress of bridge construction technology,the span of CFST arch bridges is constantly breaking through,but the percentage of its dead load also increases.As a compressive bending structure,the CFST arch bridge has more and more prominent arch stability problems.However,the dynamic stability of the structure is different from the static stability,which is more complicated due to the introduction of the time parameter.Therefore,this paper takes the Yongningjiang No.2 CFST arch bridge with a span of 30+80+30 meters as the supporting project and establishes a finite element analysis model of the whole bridge.Aiming at the dynamic stability of the CFST arch bridge,the live load,steel content,vector The research is carried out across three aspects.This paper can provide a certain reference for the research on the stability of similar bridge types.