独塔无背索斜拉桥抖振响应时程分析

Time-history Analysis of Buffering on the Single-column Pylon Cable-stayed Bridge without Back Stay

根据谐波叠加原理,以独塔无背索斜拉桥——长春轻轨伊通河桥为对象,利用有限元软件MIDAS构建了伊通河桥风振计算模型。通过对风致斜拉桥内力进行时程分析,得到各个拉索及主梁的内力、应力及位移的时程曲线。基于静力结果的对比分析,对伊通河大桥在抖振力作用下的结构安全及其使用状况作出评价,从而为独塔无背索斜拉桥的风致内力影响提供了必要的参考。

Based on the principle of harmony superposition, Yitong River Bridge, a single-pylon cable-stayed bridge without back stay is taken as an example, a wind vibration calculation model is established with finite element soft- ware-MIDAS. Through a time-history analysis of the cable- stayed bridge forces induced by wind, the internal forces, stresses and time-history curve of displacements of the main girder and each cable are obtained. Then based on the re- sult of a static analysis, the structural safety and the work- ing status of Yitong River Bridge under buffeting forces are evaluated. This research provides necessary references for analyzing the internal forces of the single-pylon cable- stayed bridge induced by wind.