钢桁梁颤振气动优化措施攻角效应及分离式改善  

Attack Angle Effects of Flutter Optimization of a Steel Truss Bridge and Corresponding Isolated Improvement

作　　者：陈星宇 汪斌[1] 李永乐[1] 廖海黎[1] 陈科宇[1] 

机构地区：[1]西南交通大学桥梁工程系,四川成都610031

出　　处：《华南理工大学学报（自然科学版）》2017年第8期120-125,138,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金杰出青年科学基金资助项目(51525804);国家自然科学基金青年基金资助项目(51508480);四川省科技创新团队项目资助(2015TD0004)~~

摘　　要：钢桁梁是建造大跨悬索桥的常用主梁结构形式,其颤振稳定性较差,通常需要采用气动优化措施提高颤振临界风速.文中以某大跨度钢桁架悬索桥为工程背景,通过节段模型风洞试验测试颤振临界风速,探讨了中央稳定板、水平稳定板及上平联下侧稳定板等常规气动措施对该钢桁梁颤振临界风速的影响,发现常规气动措施对颤振临界风速的影响具有攻角效应.提出采用分离式的气动措施,包括分离式水平稳定板、格栅式水平稳定板、分离式上平联下侧稳定板.此类措施在一定程度上可以改善攻角效应,提高钢桁梁颤振临界风速.Steel tnss girders are a common structure type for long-span suspension brdges. The f lut ter stabi l i ty ofthis structure type is poor. Therefore, aerodynamic optimization measures are usually adopted to increase the criti-cal wind speed of the flutter. In this investigation, b a sed on a lo n g -sp an s te e l tm s s g ird e r b r d g e lo c a ted a t a mountain area, the wind tunne l te s ts of the sect ion model were conduc ted to dete c t the crt i cal wind spe ed of the flutter, and the influences of the general aerodynamic measures including the central stabilizer, th e h o rz o n ta l s ta -bilizer and the stabilizer under the top lateral bracing on the crtical wind speed of the flutter were discussed. It is found that the general aerodynamic measures have attack angle effects on the crtical wind speed of the flutter. Therefore, isolated aerodynamic measures are proposed, wh ich in c lu d e th e iso lated h o rz o n ta l s ta b i l iz e r, th e g ra t-ing horzontal stabilizer and the isolated stabilizer under the top lateral bracing. The resultsaerodynamic measures can improve the attack angle effects to a certain degree, th u s in c re a s in g th e c r t i c a l windspeed of the flutter.

关 键 词：钢桁梁 颤振 优化措施 攻角效应 分离式改善 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]