下承式简支钢管混凝土拱桥吊杆索力优化研究

Finite Element Simulating and Analysis of Railway through Concrete Filled Steel Tubular Arch Bridge

通过考虑某下承式简支钢管混凝土拱桥的施工过程,对其进行了有限元分析,得出了受力最为不利施工阶段结构的内力分布。本结构为外部静定的多次超静定结构,每一次对吊杆索力的调整都会影响到结构的内力分布以及梁体、拱肋的线性,因而利用影响矩阵法对施工过程中的索力调整进行了优化,使得成桥后结构的内力分布更能符合设计要求。

The whole construction process of a concrete filled steel tubular arch bridge was analyzed in detail and then the inner forces of critical stages were attained.The bridge is a structure which is multi-statically indeterminate inside but statically determinate outside,as a result,there will be many times of structure system transformation in the whole construction process;moreover,distribution of inner force and the line type criteria of the structure will be influenced by cable adjustment of every cable.Finally,cable adjustment was optimized using impact matrix method,in this way,distribution of inner force will be more reasonable when built up.