采用双向调谐质量阻尼器的大跨度桥梁风振控制仿真分析

发布时间：2018-10-12 09:48

【摘要】：传统的调谐质量阻尼器(TMD)设计均仅针对结构某一阶模态单独设置,当用于密频结构减振时会导致附加质量过多。为减小TMD的附加质量,结合大跨度斜拉桥结构的密频与风致耦合振动特点,提出了一种新型的双向共享质量与电涡流阻尼式TMD。具体实现方式是:水平、竖向TMD的刚度构件分别采用悬臂梁与压簧,将水平向TMD整体置于压簧上面,从而构成竖向TMD的质量;导体板固定不动,使安装在TMD质量块的永磁体阵列随质量块竖向或水平方向运动,从而分别产生竖向与水平向的电磁涡流阻尼。研究结果表明:(1)电涡流阻尼可以很好地实现双向TMD装置的共享阻尼,且电涡流阻尼的大小可以很方便地调节;(2)采用双向TMD进行斜拉桥的风致振动控制减振效果良好,可行性强。
[Abstract]:The traditional tuned mass dampers (TMD) are designed for only one order mode of the structure, which will lead to excessive additional mass when it is used to reduce the vibration of the dense frequency structure. In order to reduce the additional mass of TMD and combine the characteristics of dense frequency and wind-induced coupling vibration of long-span cable-stayed bridge structure, a new type of TMD. with two-way shared mass and eddy current damping is proposed. The concrete realization methods are as follows: the stiffness members of horizontal and vertical TMD adopt cantilever beam and compression spring respectively, and the horizontal TMD is placed on the compression spring as a whole to form the mass of vertical TMD, and the conductor plate is fixed, The permanent magnet array mounted on the TMD mass block moves with the mass block vertically or horizontally, which results in the vertical and horizontal eddy current damping respectively. The results show that: (1) Eddy current damping can achieve the shared damping of bi-directional TMD devices and the magnitude of eddy current damping can be adjusted conveniently; (2) the wind-induced vibration control of cable-stayed bridges using bi-directional TMD is effective and feasible.
【作者单位】：华北水利水电大学土木与交通学院;湖南大学风工程试验研究中心;
【基金】：国家自然科学基金项目(51308214,91215302) 河南省教育厅科学技术研究重点项目(13A560711) 华北水利水电大学高层次人才项目(201212)资助
【分类号】：U441.3

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