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对舟山地区大跨径钢管混凝土拱桥——松岙大桥进行了稳定性分析。首先基于ANSYS软件二次开发功能编制了专业程序,建立杆系有限元模型进行了第一类稳定分析。随后考虑几何非线性的影响,得到各阶稳定系数。最后考虑拱肋初始挠度等缺陷的影响,并采用钢管混凝土组合材料的非线性本构关系,进行了双重非线性稳定分析。计算表明对大跨度拱桥结构进行双重非线性稳定分析是可行的,也是必要的。
The stability analysis of the large-span CFST arch bridge-Songtao Bridge in Zhoushan area is carried out. First of all, based on the secondary development function of ANSYS software, a professional program was compiled and the first type of stability analysis was established by establishing the finite element model of the bar. Then consider the impact of geometric nonlinearity, get the stability coefficient of each order. Finally, the influence of the initial rib deflection and other defects is considered. The nonlinear constitutive relation of the concrete filled steel tubular (CFST) composite is considered and the dual nonlinear stability analysis is carried out. The calculation shows that it is feasible and necessary to conduct double nonlinear stability analysis of long-span arch bridge.