中文摘要：

以主跨1088 m 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。

英文摘要：

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.