钢管混凝土桁架拱桥施工阶段应力和位移的有限元分析

Finite Element Analysis of Stress and Displacement of CFST Truss Arch Bridge in Construction Stage

文章以某219m跨径的钢管混凝土桁架拱桥为例,首先利用有限元软件Midas/civil建立了2种FEM模型,然后根据现场施工方案将整个施工过程划分为13个施工阶段,并利用Midas/civil分析得到不同施工阶段钢管混凝土拱肋的应力与位移变化规律。结果表明:钢管混凝土拱肋所承担的弯矩值较小,即钢管混凝土拱肋总体处于受压状态;最大应力和位移均可满足设计要求,从而验证了大桥施工方案的合理性。

In this paper, a concrete-filled steel tube（CFST） truss arch bridge with 219-meter-span is taken as an example, two FEM models are firstly established by using the finite element software Midas/civil.Then according to the site construction program, the whole construction process is divided into 13 construction stages, and the variation law of the stresses and displacements of CFST arch ribs in different construction stages are obtained by Midas/civil analysis.The results show that the bending moment value of CFST arch ribs is very small, that is, the CFST arch ribs are generally under compression, and the maximum value of the stress and displacement of CFST arch ribs can meet the design requirements, which verifies the rationality of the construction program.