重庆万盛藻渡大桥竖转施工转动铰受力性能分析

拱桥竖转施工是在转体施工基础上发展起来的一种常见的拱桥施工工艺,拱脚转动铰的受力性能对工艺的实施和结构体系转换具有重要作用。本文以重庆万盛藻渡大桥施工转动铰为例,利用相关有限元软件建立了有限元计算模型,通过对其进行受力分析,得到拱脚转动铰节点的应力场及容易出现塑性流动或蠕变的区域;分别分析了受力方向上最大计算应力值产生点到轴孔着力点的距离l与作用力F、钢板厚度t及轴孔直径D三种参数的对应关系,分析表明：l与作用力F呈线性关系,与钢板厚度t呈指数关系,与轴孔直径D关系不大。转动铰设计时应注意留出足够的空间,以防止转轴附近易出现塑性流动或蠕变的区域发生屈服破坏,并应严格控制好轴孔到钢板边缘的距离。

Mechanical Property Analysis of Rotating Hinge in Chongqing Wansheng Zaodu Bridge with Vertical Lifting Rotation Construction

Vertical lifting rotation construction is a common construction technique in the arch bridge which develops based on the twist construction.The mechanical property of rotating hinge in Springer has a decisive effect on the implementation process and structure system transformation.The simulation analysis on the rotating hinge of Chongqing Wansheng Zaodu Bridge were carried out using finite element software in this paper,and the stress fields of rotating hinge nods and the areas of plastic flow and creep have been obtained.The relationship among the l which is the distance from the point of maximum calculation stress to the acting point of axle hole and acting force F,steel thickness t,diameter of axle hole D were analyzed.The results show that the relationship of l and F is linear,l and t demonstrate exponential trend and l shows little correlation with D.In the design of rotating hinge should leave enough space to prevent yield damage in the areas prone to plastic flow and creep near the shaft,and strictly control the distance from the axle hole to the edge of plate.