Vibration Reduction Analysis of Landscape Towers with Variable Damping TMDs Based on Wind Tunnel Tests
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摘要: 基于风洞试验得到的各结构层风荷载时程,采用ABAQUS软件对景观塔无控结构和有控结构进行10,50,100 a重现期风作用下的风振响应分析,得到了质量调谐阻尼器(TMD)在不同重现期风荷载作用下的减振效果。计算结果表明:两级变阻尼TMD能有效减小风荷载作用下结构的响应,减振效率随着楼层的增高而增大;风荷载作用下TMD均未超出最大行程,10 a重现期风作用下处于一级阻尼;50、100 a重现期风作用下二级阻尼发挥作用;设置TMD能有效提高结构舒适度,TMD对加速度控制的效率高于位移控制;TMD作为一种有效的减振控制装置,适用于有限位需求的高耸结构风振设计。Abstract: Based on the time history of wind loads at each structural story obtained from wind tunnel tests, the wind-induced vibration responses of uncontrolled and controlled landscape towers by return period winds for 10 years, 50 years and 100 years were analyzed by the ABAQUS software, and the vibration reduction effect of TMD under wind loads in different return periods were obtained. The calculation results showed that the two-stage variable damping from TMDs could effectively reduce structural responses excited by wind loads, and the vibration-reduction efficiency increased with the increase of stories; TMDs did not exceed the longest stroke length under wind loads. It was in primary damping that excited by the return period wind for 10 years and in secondary damping excited by return period winds for 50 and 100 years; TMDs could effectively improve the structural comfort, and the efficiency of acceleration control was higher than that of displacement control; vibration reduction measures by TMDs were suitable for wind vibration control design of high-rise structures.
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Key words:
- landscape tower /
- two-stage variable damping /
- TMD /
- wind tunnel test /
- vibration attenuation
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