大跨度拱桥稳定性参数敏感性分析

Sensitivity Analysis of Stability Parameters of Long-span Arch Bridge

为了研究拱桥构件尺寸、钢板厚度等设计参数对上承式拱桥稳定性的影响,建立了某上承式拱桥的三维有限元模型,通过改变拱肋、主纵梁的结构尺寸和钢板厚度,观察其对结构失稳模态的影响。结果表明:拱肋及主纵梁构件尺寸对结构的失稳系数影响有限,桥梁整体失稳系数对钢板尺寸更为敏感,在研究变化范围内,结构未发生跃阶现象。

In order to study the influence of design parameters such as the size of arch bridge components and the thickness of steel plate on the stability of deck arch bridge,a three-dimensional finite element model of a deck arch bridge was established.By changing the structural size of arch rib and main longitudinal beam and the thickness of steel plate,the influence on the instability mode of the structure was observed.The results show that the size of the arch rib and the main longitudinal beam has limited influence on the instability coefficient of the structure,and the overall instability coefficient of the bridge is more sensitive to the size of the steel plate.Within the scope of the study,there is no jump phenomenon in the structure.