泰州大桥中塔设计关键技术研究综述

Overview of Key Technology of Middle Pylon Design of Taizhou Bridge

目前世界上建成的多塔悬索桥最大跨径仅有210m,远未发挥悬索结构应有的跨越能力,其主要原因是跨径增大后,对这种多塔连跨悬索结构体系的认识和把握还远远不够,特别是中塔的设计关键技术,存在诸多技术上的"瓶颈"需要突破。泰州大桥在设计过程中开展了"三塔悬索桥中间塔设计关键技术"研究,解决了该国际难题。介绍泰州大桥开展的中塔结构选型与行为特性、塔柱合理构造与关键连结部位连接方式研究、中塔主缆与鞍座相互作用机理及其抗滑移安全性、钢中塔弹塑性稳定分析及安全评价、人字形中塔风荷载及风致振动等研究情况。

So far,the Longest span of built multi-pylon suspension bridge in the world is only 210 meters,which is far from the span capacity of suspension structure.The main reason is that the understanding and grasp for multi-pylon continuous-span suspension structural system is far from enough when span increases,and there are many technical bottlenecks need to be broken through,especially in the key technology of middle pylon design.In the design of Taizhou Bridge,the research for the middle pylon key technology of three-pylon suspension is conducted,and the international technical problems are solved.In this paper,research on structural type selection and behavior characteristic of middle pylon,reasonable structure and connecting type for critical connecting part of middle pylon,interaction mechanism and anti-slippage safety between the main cable and middle pylon saddle,elastic and plastic stability analysis and safety evaluation of steel middle pylon,wind load and vibration caused by wind of inverted-Y shaped middle pylon are introduced.