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结合大同至准格尔增二线黄河特大桥主桥,利用有限元软件Ansys建立实体单元模型,对其0号块施工阶段及最大悬臂施工阶段稳定问题进行特征值分析,同时考虑材料和几何非线性的第二类稳定性分析。经分析得到各工况下稳定安全系数均满足规范要求;考虑材料和几何双重非线性的高墩承载能力同特征值分析计算值相比下降较大;横向风荷载对本桥稳定性影响较大,应做好防范措施确保施工安全。
Combined with the main bridge of Datong-Zhungeer second-line Yellow River Super-Large Bridge, the finite element software Ansys is used to establish the solid element model, and the eigenvalue analysis of the stability of its construction stage 0 and the maximum cantilever construction stage is carried out. The material and geometrical nonlinearity The second type of stability analysis. The results show that the stability safety factor under each working condition meets the requirements of the code. The bearing capacity of the high piers considering the material and geometrical double non-linearity decreases greatly compared with the calculated value of the eigenvalue analysis. The transverse wind load has a great influence on the stability of the bridge, Preventive measures should be taken to ensure construction safety.