考虑徐变的钢管混凝土拱桥动力分析

随着钢管混凝土应用的逐渐增多,对实际工程非常重要的徐变问题也日渐突出,而徐变对钢管混凝土结构动力响应的影响还研究甚少.为此推导了钢管混凝土轴心受压构件的徐变计算方法,建立了丫髻沙大桥有限元模型.实际测量值与已有研究成果对比表明,建立的有限元模型能够反映实际结构的动力和静力特性.基于继效流动理论和钢管混凝土统一理论,计算分析了徐变对丫髻沙大桥自振频率和动力响应的影响.结果表明徐变对桥自振频率和动力响应影响较大,特别是在徐变发生的早期阶段.

Creep effect on dynamic analysis of concrete-filled steel tubular arch bridge

As the application of concrete-filled steel tubular (CFST) members and structures is increasing day by day, the studies on creep of CFST members, which is an important influential factor to civil engineering structures, are rarely considering the dynamic response. The method of creep analysis of axially compressed CFST members is deduced. Structural model of the Yajisha CFST arch bridge is established. Using the new model, eigenfrequencies and responses under static load approximate to the actual responses of the bridge and other studied results. Based on the elastic continuation and plastic flow (ECPF) theory and the unified theory of CFST, the eigenfrequencies and the dynamic response of the Yajisha bridge are analyzed. The influence of creep action is more significant,especially in the early ageing of concrete.