摘要
以主跨1088m的苏通大桥为工程背景,根据规范推荐的风谱模型分别模拟了不同风速下裸塔结构的三维脉动风场,基于ANSYS进行了裸塔在强风作用下的风致抖振响应及其MTMD减振控制研究,重点探讨了MTMD用于大型斜拉桥裸塔抖振控制的效果及其中的关键影响因素。结果表明:TMD的数量、MTMD的质量比、频带宽、阻尼比等参数的变化对其减振效果的影响不尽一致;合理设置MTMD参数可大大降低斜拉桥裸塔的抖振位移响应,实现主塔结构抖振的有效控制。分析结果可为大跨度斜拉桥裸塔结构的风致抖振控制提供参考。
With the increase of the height and structural complexity of the long-span cable-stayed bridge tower,the buffeting response of the free-standing tower and its control become one of the key issues in bridge engineering.In this paper,Sutong Bridge,a long-span cable-stayed bridge with a main span of 1088 m is taken as the engineering background.3-dimensional wind turbulence field for the free-standing tower is simulated according to the measured specification spectrum,the buffeting response of the free-standing tower under the action of strong wind and its control using MTMD are studied based on ANSYS.The control effect on buffeting of the free-standing tower of long-span cable-stayed bridge and the key MTMD parameters are investigated. Results show that the influences of the MTMD parameters including the number of TMD,mass ratio,frequency bandwidth and damping ratio are not identical.The MTMD with reasonable pa-rameters can greatly decrease the buffeting displacements for the free-standing tower of the cable-stayed bridge,and therefore effectively control the buffeting of the main tower.Results can pro-vide references for wind-induced buffeting control of the free-standing tower of long-span cable-stayed bridges.
出处
《空气动力学学报》
CSCD
北大核心
2015年第5期678-685,共8页
Acta Aerodynamica Sinica
基金
国家重点基础研究发展计划青年科学家专题(2015CB060000)
国家自然科学基金(51378111
51438002)
教育部新世纪优秀人才支持计划(NCET-13-0128)
霍英东教育基金会青年教师基金应用研究项目(142007)
中央高校基本科研业务费专项基金资助项目(2242015K42028)
关键词
大跨度斜拉桥
裸塔
风场模拟
抖振控制
多重调谐质量阻尼器
long-span cable-stayed bridge
free-standing tower
wind field simulation
buffe-ting control
multiple tuned mass dampers （MTMD）
