应用复合梁单元实现钢管混凝土拱桥的极限承载力分析

Load capacity analysis of concrete filled steel tube arch bridge with the composite beam element

进行大跨度钢管混凝土拱桥的极限承载力分析,需要综合考虑几何和材料非线性、混凝土收缩和徐变、温度变化等多种因素的影响。本文从固体力学的基本理论出发,建立适于考虑上述诸多因素的复合梁单元,阐述了基于该单元的钢管混疑土拱桥极限承载力分析程序的实现方法,并通过与一个哑铃形截面钢管混凝土组合式拱肋极限承载力试验结果的对比验证了其可行性。

In the load capacity analysis of the large span concrete filled steel tube (CFST) arch bridge, factors such as geometrical and material nonlinearity, creep and shrinkage and temperature variation need to be taken into account. In this article, a composite beam element which fits consideration of the above mentioned factors is established on the basis of fundamental theories of the solid mechanics, and the method to realize the load capacity analysis program for CFST arch bridge is explained. Feasibility of this program is also verified by comparison of computation results with an experiment on a compoundingform CFST arch rib of dumbbellshaped section. 