薄壁特高墩预应力混凝土连续刚构桥的空间稳定性

Space stability of prestressed concrete continuous rigid frame bridge with tall pier and thin wall

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了计算分析。以洛河特大桥为例,当墩高大于100m时,最大双悬臂状态的结构稳定性安全储备较低,其余工况均有足够的稳定性。计算结果表明,结构的计算模型及几何特征对其稳定性的影响较大,且应对薄壁高墩刚构桥的T构施工过程进行严密监控。所提出的结构稳定性研究方法及分析结果为该类桥的设计提供了可靠依据。

Based on Eluer elastic theory, the space stability is calculated by finite element method. Taking Luohe bridge as an example, if the pier's height is more than 100 m, the longest double cantilever structure's degree of stabilizing safety is lower. The rest cases have enough safety. The results show that the structure's calculating model and geometric characteristics are the most important factors that effect the stability. The double cantilever structure's constructing process must be surveilled strictly. The researching method and analysis result provide the reliable basis for designing this typical bridge.