三塔悬索桥刚性中塔的鞍缆防滑技术

Anti-slip technology between main cable and saddle on rigid middle tower of three-tower suspension bridge

摘要:

为了解三塔悬索桥刚性中塔不同结构的鞍缆防滑效能,提出5个方案,即在跨中设置中央扣、改变矢跨比、在塔根和主缆间设置扣索、在塔顶处设置钢结构构件、在索鞍两侧主缆上添加辅助拉索.有限元法和解析法的结果显示,中央扣和扣索方案的效果甚微,其余3个方案则十分有效.据此给出相应设计建议.

Abstract:

To understand the effects of anti-slip techniques between main cable and saddle of a three-tower suspension bridge with a rigid middle tower,five structural schemes are proposed,which are adding a central buckle,changing the rise-span-ratio,installing a buckling cable between tower and main cable,setting a steel structure on the top of tower and fabricating an assistant cable near the saddle.The calculated results by finite element method and analytical method show that the central buckling scheme and buckling cable scheme have little anti-slip effect,but the other three schemes are very effective.Based on these some design recommendations are given.