基于ANASYS的单面刚构拱桥稳定性分析

介绍在ANASYS中实现桥梁结构稳定性分析的方法,对某单面刚构拱桥进行了考虑恒载、风载、列车荷载等荷载工况下的弹性特征值稳定性分析,分别考虑恒载作用下的几何非线性、材料非线性和双重非线性对某大桥进行了非线性稳定分析,对几种稳定分析结果进行比较,得出了重要结论:考虑刚构一单肋系杆拱组合桥梁的稳定性时,一定要同时考虑几何非线性和材料非线性的共同影响,弹性稳定安全系数只是一个理论上的解,必须取很大安全系数才行.

Stability analysis of combinational bridge with rigid frame and single-ribbed tied arch in ANSYS

The stability analyzing method of bridges by ANSYS is described.The first sort of stabilities under the combinations of dead loads,wind loads and train loads,and the second sort of stabilities under the dead load taking into account the geometrical nonlinearity and material nonlinearity are analyzed.The results of the two sorts of stabilities are compared.It is observed that it is necessary to consider the effects of the geometrical nonlinearity and material nonlinearity at the same time when the stability of the combinational bridge with rigid frame and single-ribbed tied arch and the safe coefficient of first sort of stabilities is only a theoretical value and must be set as a big value in application.