摘要
为研究柔性系杆钢管混凝土拱桥的极限承载力,以某280m主跨桥为例,借助有限元程序建立空间有限元模型,采用三种不同计算方法对大桥的极限承载力进行研究,研究过程中引入考虑套箍效应的钢管内混凝土本构关系,得出了不同工况下大桥的极限荷载系数、破坏模式以及荷载-位移曲线之间的关系。结果表明:某特大桥的极限承载力满足要求,破坏模式均为面外失稳破坏;采用线弹屈曲方法和仅考虑结构几何非线性的方法均会过高地估计结构的极限承载力,但线弹性方法甚至不能真实的反应结构的破坏模式,要准确评估出拱桥等桥梁结构的极限承载力,必须考虑结构几何与材料的双重非线性。
As the ultimate bearing capacity of flexible concrete tied steel arch bridge,with a main span 280 m bridge as an example,by means of finite element program of finite element model is built,using three different calculation methods of ultimate bearing capacity of the bridge,the constitutive relation of concrete filled steel tube ferrule effect in considering the introduction of the research process,the relationship between the ultimate load coefficient,under different conditions of bridge failure mode and load displacement curve.The results show that meet the requirements of the ultimate bearing capacity of a bridge,the failure mode are out of plane instability; with linear elastic buckling method and the method only considering the geometrical nonlinear will overestimate the ultimate load carrying capacity of structure,but the elastic method can not even the real reaction mode of structure failure,to accurately the evaluation of ultimate bearing capacity of arch bridge and the bridge structure,the double nonlinearity must be considered structural geometry and material.
出处
《工程建设与设计》
2017年第5期106-107,110,共3页
Construction & Design for Engineering
