考虑弹性大位移影响的中承式钢管混凝土拱桥稳定性

The Stability of Half-through Concrete Filled Steel Tubular Arch Bridge with Respect to Geometric Nonlinearity and Material Elasticity

在大跨度钢管混凝土拱桥的设计中 ,稳定问题至关重要。针对影响这一问题的主要因素 ,如计算模型的建立、结构的几何非线性行为等进行了较为深入的探讨。根据具体的桥梁实例 ,建立了两种空间有限元计算模型 ,对每一种模型分别进行了第一类和第二类稳定问题计算。计算结果表明 ,在各个设计阶段采用不同的计算模型是恰当合理的做法 ;另外通过对比分析可知结构的几何非线性对该桥的稳定影响很小。

In the design of large span concrete filled steel tubular arch bridge, stability analysis is crucial. Two important factors, the calculating model and geometric nonlinearity of structure which can affect the stability, are considered. Two calculation models are made according to a real bridge, the linear and nonlinear properties are taken into account during the calculation. The main conclusions are that it is suitable to make different models with respect to various design stage and the geometry nonlinear property of this kind of bridge can be neglected.