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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 CFST arch bridges, the stability issue is of crucial importance. Aiming at the main factors affecting this problem, such as the establishment of computational model and the geometric nonlinear behavior of the structure, a more in-depth discussion is made. According to the concrete example of the bridge, two kinds of space finite element calculation models are established, and the first and the second type of stability problems are respectively calculated for each model. The calculation results show that it is reasonable and reasonable to adopt different calculation models at each design stage. In addition, through the comparative analysis, the geometric nonlinearity of the structure has little effect on the stability of the bridge.