大跨度连续刚构桥稳定性分析

以欧拉弹性理论为基础，利用空间有限元法对薄壁特高墩预应力混凝土连续刚构桥的空间稳定性进行计算分析。以某桥为例，计算其施工阶段及成桥阶段的稳定性。计算结果表明，结构的计算模型及几何特征对其稳定性影响较大，且应对薄壁高墩刚构桥的T构施工过程进行严密监控。采用对比的研究方法对一些影响桥梁稳定的因素进行了分析，分析结果可为该类桥的设计提供参考。

Analysis for Stability of Large-span Continuous Steel Structure Bridge

Based on the Euler elastic theory, this paper calculates and analyzes the spatial stability of thin： wall ultrahigh-pier prestressed concrete continuous steel structure bridge by means of the spatial finite element method. Taking a bridge as example, the paper calculates the stability in construction stage and completion stage. The results of calculation show that calculation model and geometrical properties of a structure have big influences on stability, and T structure of thin-wall high-pier steel structure bridge should be closely supervised and controlled during construction. The research methods by comparison are adopted to analyze the factors influencing the stability of bridge, and the results of analysis can provide reference for designing bridges of the same kind.