大跨度中承式钢箱混凝土系杆拱桥稳定性研究

Stability Research of Long Span Half-through Concrete Tied Arch Bridge with Steel Box Section

拱式连续梁系杆拱桥是一种造型新颖、受力复杂的桥梁结构,其稳定性问题是不可忽视的。采用ANSYS有限元分析软件对该桥建立计算分析模型,计算该桥梁在各种荷载组合作用下的第一类稳定性。同时计算了该桥在几何、材料以及几何材料双重非线性作用下的第二类稳定性,并将两者的结果作了对比。计算分析结果表明:材料非线性对该桥的稳定性影响很大,同时给出了拱桥稳定性计算的一般性方法,其结果可以为同类型桥梁提供参考。

Tied-arch continuous-beam bridge is a kind of bridge structure with novel shape and complex stresses.So the stability issues should not be neglected.Spatial analysis model of an actual bridge was established by ANSYS finite element software and the first stability of this bridge under the actions of various kinds of load combinations were analyzed in this article.The secondary stability of this bridge under the actions of geometric nonlinearity,material nonlinearity and dual nonlinearities were also analyzed respectively in this article.The comparing result verifies that the material nonlinear effect on the stability of this bridge is very big.Also general computing methods of arch bridge stability were introduced in this article.The results can provide reference for similar kinds of bridges.