运营阶段悬索桥钢筋混凝土加劲桁梁有限元分析方法研究

Finite element analysis method study of stiffened reinforced concrete truss girder for suspension bridge of operational phase

采用传统分析方法对悬索桥钢筋混凝土加劲桁架结构进行分析,结果表明在运营荷载作用下构件计算内力普遍存在偏大问题。本文考虑结构几何非线性和材料非线性的影响,提出了该类结构杆件刚度考虑混凝土材料非线性影响的模拟方法,对某悬索桥进行了有限元分析及承载能力检算分析,并将计算分析结果与荷载试验结果进行对比分析,结果表明,运营阶段结构内力计算时,几何非线性效应不明显,考虑混凝土构件开裂对杆件刚度的折减影响,使构件受力状况与实际状况更加吻合。

For the stiffened reinforced concrete truss girder structure of suspension bridge,the calculated internal forces which caused by operational loads is too large with traditional analysis methods.In addition to considering the geometrically nonlinear characteristics,it focuses on taking into account the material nonlinearity.Propose the stiffness analytical method for such structure members which need to consider the nonlinear effect of concrete material.Take a suspension bridge as example,analysing the structural bearing capacity and comparing the calculated results of static load with load test results.It shows that the geometric nonlinear effect is not obvious when calculating the internal force of the operational phase.Consider reduction of the stiffness of the concrete elements rod with cracking can significantly reduce the calculated internal force of the members,so that the member force status is more consistent with the actual situation.