高墩大跨刚构桥桥墩的稳定性与承载能力研究

Stability and Carrying Capacity of Long-Span Continuous Rigid Frame Bridge with High Piers

以张家界太极溪特大桥为研究对象,同时使用ANSYS与ABAQUS两种有限元软件进行计算分析,首先,采用线弹性稳定分析方法对大跨预应力混凝土连续刚构桥各施工阶段双肢薄壁墩的稳定性和失稳模态进行计算;随后,使用非线性仿真分析方法对该桥各施工阶段进行计入初始几何缺陷的非线性分析.通过分析可知:在相同的荷载工况作用下,各施工阶段的极限承载力均小于成桥阶段的极限承载能力;裸墩状态与0号块施工阶段该桥桥墩的纵向稳定性较小,结构在几何缺陷与材料塑性的影响下,承担荷载能力明显减弱.利用ANSYS与ABAQUS两种软件计算所得结论极为相近,通过其结果的相互验证,可以在一定程度上确定本次计算分析所建模型与分析方法的正确性,可为今后该类桥桥墩的施工、设计与研究提供参考.

Tai Ji River Bridge in Zhangjiajie is taken as the research object, and two kinds of the finite element software ANSYS and ABAQUS are used to calculate, and to analyze. Firstly, the stability and instability modes of the thin-walled piers of the long-span pre-stressed concrete continuous rigid frame bridge are calculated by the linear elastic stability analysis method. Then, the nonlinear simulation analysis method is used to analyze the nonlinear analysis of the initial geometric imperfections of the bridge. It can be seen from the analysis that under the same load condition, the ultimate bearing capacity of each bridge stage is less than the ultimate bearing capacity of the bridge stage. The longitudinal stability of the bridge pier is small. And under the influence of geometric defects and plasticity of materials, the load capacity of the structure is obviously weakened. The results obtained by ANSYS and ABAQUS are very similar. By the mutual verification of the results, we can determine the model and the model. The correctness of the analysis method can provide reference or basis for the construction, design and research of bridge piers in the future.