大跨双向悬索结构屋盖IMD减振控制研究

Investigation of vibration control on bidirectional long-span suspended-cable roof structure with IMD

基于惯性质量阻尼器(inertial mass damper,IMD)对拉索减振的控制原理,使用有限元软件ANSYS建立了IMD有限元模型,比对并验证了模型结果.以某大跨双向悬索结构为背景,针对主要目标控制模态,提出IMD减振设计方法.以模态阻尼比作为减振参考指标,设计了一种IMD控制参数的计算方法,分别计算了IMD安装前后的模态阻尼比以及风致振动响应.结果表明,使用本文提出的减振设计方案,目标模态的模态阻尼比从2.12%提高至57.74%,最大风致振动响应降低了88%,效果显著.

Based on the theory of cable vibration control with inertial mass damper(IMD),this paper presented an IMD FEM-model using ANSYS.Results of FEM-model were compared and verified with the theoretical results from state-space method.An IMD design procedure of a bidirectional long-span suspended-cable roof structure was provided.The modal damping ratio of the target mode was used as an index to evaluate vibration reduction performance.The modal damping ratios and the wind-induced vibration responses of structure with and without IMD were calculated respectively.It is shown that the modal damping ratio of the target mode increases from 2.12%to 57.74%and the maximum wind-induced vibration response decreases by 88%.