连梁装置对斜拉桥与引桥碰撞影响分析

由于斜拉桥与引桥的动力特性存在较大差异,在地震作用下斜拉桥与引桥存在发生非同向振动的可能,进而引起碰撞响应,并导致伸缩缝破坏或落梁震害.目前针对大跨度斜拉桥与引桥之间碰撞问题的研究还不够深入,且对于斜拉桥与引桥之间防碰撞措施的研究还不够系统,为此,研究了连梁装置对斜拉桥与引桥之间碰撞响应的减震效果,分析了连梁装置结构参数对斜拉桥与引桥之间碰撞响应的影响规律.研究表明:受拉连梁装置可以有效减小相邻梁体间相对位移,并且能明显减小碰撞力峰值,是一个较为理想的斜拉桥与引桥之间的防碰撞措施,但对引桥梁体位移以及引桥固定墩地震需求的影响较为复杂.

Analysis of Effect of Unseating Prevention Devices on the Collision of Cable-stayed Bridge and Approach Span

Dynamic characteristics between the cable-stayed bridge and the approach-bridge are different.It the out-of-phase vibrations may happen under horizontal earthquake effect.Then lead to collision response,cause expansion joint damage and beam collapse.Aiming at the research on the collision problem between the big span cable-stayed bridge and approach span is not overall deeply,the anti-collision measures study between cable-stayed bridge and approach span is not systematical enough,The unseating prevention devices shock absorption effect on the collision of cable-stayed bridge and approach span is researched,the influence law of unseating prevention devices on the collision of cable-stayed bridge and approach span is analyzed systematically.The results show that unseating prevention devices can reduce the relative displacement of adjacent beams and collision force peak.Unseating prevention devices are perfect prevent collision measure between cable-stayed bridge and approach span,But the influence of approach span's displacement and approach span fixed pier seismic requirements are rather complex.