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 truss girders are a common structure type for long-span suspension bridges.The flutter stability of this structure type is poor.Therefore,aerodynamic optimization measures are usually adopted to increase the criti- cal wind speed of the flutter.In this investigation,based on a long-span steel truss girder bridge located at a mountain area,the wind tunnel tests of the section model were conducted to detect the critical wind speed of the flutter,and the influences of the general aerodynamic measures including the central stabilizer,the horizontal sta- bilizer and the stabilizer under the top lateral bracing on the critical wind speed of the flutter were discussed.It is found that the general aerodynamic measures have attack angle effects on the critical wind speed of the flutter.Therefore,isolated aerodynamic measures are proposed,which include the isolated horizontal stabilizer,the grat- ing horizontal stabilizer and the isolated stabilizer under the top lateral bracing.The results show that these isolated aerodynamic measures can improve the attack angle effects to a certain degree,thus increasing the critical wind speed of the flutter.