静风效应对千米级悬索桥颤振的影响  

Study on aerostatic effects on flutter of kilometer level suspension bridge

作　　者：熊龙[1] 廖海黎[1] 马存明[1] 王骑[1] Xiong Long Liao Haili Ma Cunming Wang Qi(Key Laboratory for Wind Engineering of Sichuan Province, Southwest Jiaotong University, Chengdu 610031, China)

机构地区：[1]西南交通大学风工程四川省重点实验室,四川成都610031

出　　处：《华中科技大学学报（自然科学版）》2016年第12期44-49,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51378442);国家重点基础研究发展计划资助项目(2013CB036300)

摘　　要：在状态空间法的基础上,提出考虑静风效应的三维颤振分析方法.以驸马大桥为工程背景,采用自由振动法识别攻角从0°到6°主梁断面的颤振导数,在考虑非线性静风引起的主梁附加攻角效应以及结构动力特性变化的基础上,运用状态空间法对大桥进行三维颤振分析.结果表明:附加攻角对颤振导数有明显的影响;在颤振临界点,静风效应会使主梁附加攻角增大、结构动力特性降低;3°攻角下考虑静风效应,桥梁的颤振临界风速会降低14%.Based on the state-space approach ,an approach of three-dimensional flutter analysis was described ,in which the aerostatic effects had been taken into consideration .Taken the Fuma Bridge as the engineering background ,the flutter derivatives of the bridge at different attack angle （0°-6°） were tested by free motion tests in the present study ,and by considering the effects of additional wind attack angle and the changes of structural dynamics induced by nonlinear static wind load ,the three dimensional multimode coupled flutter analysis was carried out by using state space method .The re-search shows that the additional attack angle has a significant effect on the flutter derivatives .At the critical flutter wind speed ,if the aerostatic effects are fully taken into account ,an increase in attack angle and a decrease in modal frequency will be found ,meanwhile ,the critical flutter wind speed will be reduced by 14% compared with conventional method with 3＆#176; attack angle .

关 键 词：悬索桥 静风效应 颤振导数 状态空间法 攻角效应 结构动力特性 

分 类 号：TU997[建筑科学—市政工程]