改善悬索桥施工阶段颤振稳定性的架设方法研究  

Study on Erection Sequence for Improving Flutter Stability of Suspension Bridges During Erection

作　　者：张新军[1] 孙炳楠[2] 孟松兔[1] 项海帆[3] 

机构地区：[1]浙江工业大学建筑工程学院,杭州市310032 [2]浙江大学建筑工程学院,杭州市310027 [3]同济大学桥梁系,上海市200092

出　　处：《公路》2002年第12期24-28,共5页Highway

摘　　要：大跨径悬索桥施工阶段尤其是施工初期的颤振稳定性是建设过程中面临的重要问题 ,它将受到主梁架设方法的重要影响。以宜昌长江大桥为工程背景 ,运用多模态颤振分析方法 ,分析了不同主梁架设方法下颤振临界风速的变化趋势。分析结果表明The aerodynamic instability of long span suspension bridges is a serious engineering concern during erection particularly in the early erection stage. Its characteristics are significantly influenced by the sequence of the deck erection. By taking the Yichang Suspension Bridge over Yangtze River as example, the flutter stability with the deck erected by different sequence and non symmetrical sequence is detemined by the multi mode flutter analysis. The evolution of flutter speed with different deck erection sequence is also discussed. It is found out that the erection program from pylons to midspan and the non symmetrical erection sequence are aerodynamically favorable for the deck erection of long span suspension bridges particularly in the early erection stage.

关 键 词：悬索桥 施工阶段 颤振稳定性 架设方法 多模态颤振分析 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U445[交通运输工程—道路与铁道工程]