东方大桥空间稳定性分析

Analysis on spatial structure stabilization of the Eastern bridge

采用大型通用有限元分析软件ANSYS,对飞燕式钢管混凝土提篮拱桥——东方大桥的空间稳定性进行研究,并对影响其稳定性的因素进行分析和总结.研究结果表明:拱肋的矢跨比对东方大桥的稳定性影响较大,稳定安全系数随矢跨比减小,且减小幅度较大;而宽跨比、内倾角、横撑形式、吊杆损伤对稳定性也有一定的影响,但影响较小,稳定安全系数随各参数的变化,减小幅度不大.

The spatial structure stabilization of the Eastern bridge--a concrete-fill steel tubular arch bridge of flying swallow basket-type was analyzed with ANSYS for the affecting factors. Studies revealed that the rise-span ratio of the arch rib had a great effect on the stability, and the stability safety coefficient with the decrease of rise-span ratio significantly decreased while the width-span ratio. The internal inclination angle, the form of cross braces and the damage to the suspender had less effects, and stability safety factor decreased marginally with the changes in the parameters.