空间缆索体系悬索桥的抗风稳定性研究  

Study of the wind stability of long-span suspension bridges with spatial cable systems

作　　者：张新军[1] 

机构地区：[1]浙江工业大学,浙江杭州310014

出　　处：《土木工程学报》2011年第6期80-86,共7页China Civil Engineering Journal

基　　金：浙江省自然科学基金(502118;Y104577)

摘　　要：为了探索理想的大跨度悬索桥的缆索体系以提高其横向及扭转刚度,以大跨度地锚式悬索桥——润扬长江公路大桥南汊桥为工程背景,采用不同缆索空间布置形式试设计三座具有空间缆索体系的方案桥,采用三维非线性空气静力和动力稳定性分析方法,分别对其动力特性、空气静力和动力稳定性进行分析和比较,并探讨具有良好抗风稳定性的大跨度悬索桥的合理缆索体系。结果表明:悬索桥采用内倾式空间缆索体系后,结构的侧弯及扭转频率增大,结构的空气动力稳定性增强;而采用外倾式空间缆索体系时,结构的侧弯及扭转频率减小,但结构的静风稳定性增强;考虑到悬索桥的空气动力稳定性一般比静风稳定性差,因此从总体抗风稳定性考虑,大跨度悬索桥采用内倾式空间缆索体系则比较有利。To search for a favorable cable system of long-span suspension bridges for strengthening the lateral bending and torsional stiffness,a long-span suspension bridge,the Runyang Highway Bridge over the Yangtze River,is employed as an example.Three cases with different spatial cable systems are designed,and the structural dynamic characteristics,the aerostatic and aerodynamic stability are investigated numerically by using 3-D nonlinear aerostatic and aerodynamic analysis.The cable system favorable to improving the wind stability of long-span suspension bridges is discussed.The results show that comparing with bridges with parallel cable systems,the suspension bridge with inward-inclined spatial cable system has greater lateral bending and torsional frequencies and better aerodynamic stability.For the suspension bridge with outward-inclined spatial cable system,it has less lateral bending and torsional frequencies,but better aerostatic stability.However,in comparison with the aerostatic stability,the suspension bridge is more prone to aerodynamic instability,and therefore considering the overall wind stability,the inward-inclined spatial cable system seems more favorable for long-span suspension bridges.

关 键 词：大跨度悬索桥 空间缆索体系 动力特性 空气静力稳定性 空气动力稳定性 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]