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新密市溱水路大桥设计在中国首次采用了波形钢腹板无背索部分斜拉桥结构。笔者介绍了弹性稳定计算理论、研究第一类稳定问题的工程意义、基于数值解的第一类稳定问题的有限元分析方法和3种方法的稳定安全系数表达式。采用Midas/Civil屈曲分析模块,按照上述方法3计算得到波形钢腹板箱梁无背索部分斜拉桥结构整体最小稳定安全系数及临界荷载,并进行了多阶弹性稳定分析。分析结果表明该桥梁结构稳定安全系数较大,整体稳定性较好。
Xinmi City waterway bridge design in China for the first time using corrugated steel webs without cable part of the cable-stayed bridge structure. The author introduces the theory of elastic stability, the engineering significance of the first type of stability problem, the finite element analysis method of the first type of stability problem based on numerical solution, and the expression of the stable safety factor of the three methods. Using the Midas / Civil buckling analysis module, the minimum stable safety factor and the critical load for the cable-stayed cable-stayed cable-stayed bridge with corrugated steel box girder are obtained by the above method 3 and multi-stage elastic stability analysis is carried out. The analysis results show that the stability and safety factor of the bridge structure is large and the overall stability is good.