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基于非线性稳定理论,采用LUSAS通用有限元软件,针对南门溪大桥钢管混凝土提篮拱桥施工的每一阶段建立了分析模型,计算结果表明拱肋施工过程中的稳定性远较成桥稳定性差,虽考虑了几何非线性及考虑材料非线性的双重非线性效应对各阶段拱肋稳定均存在显著影响,但成拱各阶段失稳可能性较小,理论上该桥的稳定性是有保障的。文章仅就拱肋成拱的每一过程的弹性屈曲分析、考虑几何非线性的屈曲分析以及考虑几何、材料双重非线性的屈曲分析作了重点介绍。
Based on the nonlinear stability theory and the general LUSAS finite element software, the analysis model is established for each stage of Nanmenxi CFST arch bridge construction. The calculation results show that the stability of the arch rib construction is far less than that of the bridge construction, Although considering the geometrical nonlinearity and considering the material nonlinearity, the nonlinear effect has a significant influence on the arch stability of each stage, but the instability of the arches in each stage is less likely. In theory, the stability of the bridge is guaranteed . The article focuses on the elastic buckling analysis of each process of arching arch, the buckling analysis considering geometrical non-linearity, and the buckling analysis considering geometrical and material’s double non-linearity.