G3铜陵长江大桥交叉索防碰减振措施研究

Research on Anti-collision and Vibration Reduction Measures for Main Bridge of Tongling Changjiang River Rail-cum-road Bridge Carrying a Section of G3 Expressway

G3铜陵长江公铁大桥主桥为主跨988 m的斜拉-悬索协作体系桥,每个索面布置了6对交叉索,交叉索间距较小,最小间距仅0.152 m,斜拉索在风荷载作用下,极可能会在交叉索区域发生碰撞。本文建立了G3铜陵长江公铁大桥主桥的有限元分析模型,计算了列车荷载、温度变化等日常荷载作用下交叉索处相对位移情况,研究了百年风荷载激励下交叉索碰撞情况,发现发生碰撞的交叉点均集中于最外侧的斜拉索上,为此研发了一种防撞装置,计算表明在18#交叉索处设置该措施可有效避免交叉索发生碰撞。

The main bridge of the G3 Tongling Yangtze River Public Railway Bridge is a cable-stayed suspension cooperative system bridge with a main span of 988m.Each cable surface is arranged with 6 pairs of cross cables,with a small spacing of only 0.152m.Under wind load,the diagonal cables are highly likely to collide in the cross cable area.This article establishes a finite element analysis model for the main bridge of G3 Tongling Yangtze River Public Railway Bridge,calculates the relative displacement of the crossing cables under daily loads such as train loads and temperature changes,and studies the collision situation of the crossing cables under century old wind load excitation.It is found that the collision points are concentrated on the outermost inclined cables.Therefore,we have developed a collision prevention device,and the calculation shows that setting this measure at the 18#crossing cable can effectively avoid collision of the crossing cables.