三塔悬索桥的抗风稳定性研究  

A Study on Wind Stability of Three-Tower Suspension Bridges

作　　者：张新军[1] 赵孝平[1] 

机构地区：[1]浙江工业大学建筑工程学院,杭州市310014

出　　处：《公路》2008年第11期67-71,共5页Highway

摘　　要：以在建1080 m主跨的三塔双跨悬索桥——泰州长江公路大桥为工程背景,采用三维非线性空气静力和动力稳定性分析方法,对其动力特性、空气静力和动力稳定性进行了分析,并与相同桥跨布置中间桥塔采用混凝土塔的方案桥,以及相同主跨的双塔单跨悬索桥的抗风稳定性进行了比较。结果表明:增大中间塔的刚度,可以有效提高三塔悬索桥的扭转频率以及抗风稳定性;由于中间塔缺乏有效的固定作用,与双塔悬索桥相比,三塔悬索桥的空气动力稳定性差,但其静风稳定性则较好。By taking a three-tower suspension bridge, Taizhou Highway Bridge over Yangtze River with main span of 1 080 m, as example, the structural dynamic characteristics, the aerostatic and aerodynamic stability are investigated numerically by 3D nonlinear aerostatic and aerodynamic analysis, and compared to those of the bridge with concrete intermediate tower and two-tower suspension bridge with the same main span. The results show that structural torsional frequencies and wind stability are efficiently improved by increasing structural stiffness of the intermediate tower; due to lack of effective anchorage for the intermediate tower, as compared to two-tower suspension bridge, three-tower suspension bridge becomes more susceptible to aerodynamic instability, and but it becomes more stable aerostatically.

关 键 词：三塔悬索桥 动力特性 空气静力稳定性 空气动力稳定性 

分 类 号：U442.59[建筑科学—桥梁与隧道工程]