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为探讨大跨径连续箱梁桥稳定性的影响因素,以四川省虹云桥为研究对象进行抗倾覆稳定性验算,同时利用Midas/Civil程序软件建立有限元模型,对梁桥在最大悬臂阶段和成桥阶段不同荷载工况下的稳定性进行模拟分析,得到了结构各个工况下的屈曲模态和一阶稳定性系数。研究结果表明:该连续箱梁桥在最不利荷载工况下的抗倾覆稳定系数1.5;一阶稳定性系数91.2;其中,挂篮坠落产生的冲击荷载对结构的稳定性影响最大,直接导致结构在不同的荷载工况下一阶稳定性系数减少13.2%~15.4%。
In order to investigate the influencing factors on the stability of long-span continuous box girder bridge, the anti-overturning stability check was carried out on Hongyun Bridge in Sichuan Province. At the same time, the finite element model was established by Midas / Civil program software, And the stability under different load conditions in the bridge stage were simulated and the buckling modes and the first-order stability coefficients under different conditions were obtained. The results show that the stability of the continuous box girder bridge under the most unfavorable load conditions is 1.5, and the first-order stability coefficient is 91.2. Among them, the impact load caused by the falling of the hanging basket has the greatest impact on the stability of the structure, Under different load conditions, the first-order stability coefficient decreased by 13.2% -15.4%.