大跨高墩连续刚构桥墩型选择及稳定性分析

PIER TYPE SELECTION AND STABILITY ANALYSIS OF LARGE-SPAN AND TALL-PIER CONTINUOUS RIGID FRAME BRIDGE

为掌握大跨高墩连续刚构桥稳定性与桥墩类型之间的关系,基于空间有限元法,采用MIDAS CIVIL建立某大跨高墩连续刚构桥的有限元模型,分析了在自重、汽车等荷载作用下不同桥墩形式对施工阶段、成桥阶段稳定性的影响。分析表明,对于大跨高墩连续刚构桥,增加壁厚、设置系梁、选择抗推刚度大的墩型有利于提高桥梁稳定性,但也会影响受力性能、施工难度、性价比等因素,因此需综合多种因素分析桥墩的稳定性问题。

In order to grasp the relationship between the stability of large-span and tall-pier continuous rigid frame bridge and the type of bridge pier, the finite element model of a large-span tall-pier continuous rigid frame bridge isestablished by MIDAS CIVIL based on the space finite element method. The influence of different pier forms on the stability of the bridge during construction and completion is analyzed under load such as self-weight, automobile, etc. The analysis shows that for the continuous rigid frame bridge with largespan and tallpier, increasing the wall thickness, installing the tie beam and choosing the pier type with large anti-push stiffness is conducive to improving the stability of the bridge, but it will also affect the mechanical performance, construction difficulty, cost performance and other factors, so it is necessary to analyze the stability of the bridge pier with multiple factors.