摘要
众所周知,使用TMD对减少结构风振有着很好的效果,但也有很多由频率过于敏感而引起的局限性和负作用。为了研究在高层结构上应用阻尼器或TMD减振究竟孰优孰劣,以及阻尼器能否代替TMD抗风等问题,本文针对某150m高层混凝土结构分别设计了对应的两种主要用于抗风的减振方案,并对相同工况下各自的减振效果加以比较。本文使用以往工程的人工风波进行数值积分,计算表明,一定数量直接安置的阻尼器可以和上百吨重的TMD起到同样的抗风效果,且在高效的套索连接形式帮助下,前者的成本不到后者的二分之一。结果表明,阻尼器在风振和地震工况下均有良好的减振效果,而TMD仅能用于抗风,且TMD会在一定程度上加剧结构的扭转效应。
As it is known, using TMD to reduce wind-induced vibration of structures has an excellent effect. But there are also a lot of limitations and negative effects due to the sensitiveness of frequency. To study installing dampers directly or using TMD which one is better on vibration attenuation, as well as whether the damper could take the place of TMD on wind resistance, two corresponding damping schemes, mainly for wind resistance, are designed for a 150 - meter-high concrete building, and the damping effects under same loading conditions arc compared. Analyses in this paper are proceeded with numerical integration using artificial wind time-history excitation of previous project. Calculation results show that, to reduce wind-induced vibration, a certain amount of dampers installed directly exhibit the same or better effect as TMD which may be more than 100 tons. And benefiting from toggle brace and the high- efficiency configuration, the cost of the former is less than half of the latter. Results also show that the dampers perform satisfactorily under both wind or seismic excitation while the TMD can only use for wind, and the TMD may cause the torsion of the structure aggravated to a certain extent.
出处
《工程抗震与加固改造》
北大核心
2013年第3期54-61,共8页
Earthquake Resistant Engineering and Retrofitting
关键词
阻尼器
TMD
抗风
套索
扭转
damper
TMD
wind resistance
toggle
torsion
