共查询到17条相似文献,搜索用时 328 毫秒
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分别输入El-Centro波(N-S)、Taft波和人工合成的合肥波,通过Newmark-β法计算了合肥电视塔的地震响应.最后利用塔上60t生活和消防水箱作为调频质量阻尼器(TMD),通过大量时程分析来对TMD参数进行优化分析,确定了3条地震波作用下TMD的最优参数.TMD的参数分析结果表明,采用最优参数的TMD使得电视塔的地震响应大大降低. 相似文献
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首先对合肥电视塔进行了动力特性分析,分析表明该塔具有明显的鞭梢效应和振型退化的特点,计算分析时,应考虑高振型的影响。其次分别输入El-Centro波(N-S)、Taft波和人工合成的合肥波,通过Newmark-β法对合肥电视塔进行地震响应分析,分析结果表明,结构的地震反应是多振型的组合。 相似文献
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地震作用下合肥电视塔粘滞流体阻尼器减震的优化参数分析 总被引:4,自引:1,他引:3
本文以合肥电视塔为工程背景,探讨了粘滞流体阻尼器对高耸电视塔在强震作用下地震响应的振动控制。分别进行了电视塔在EL-Centro波、Taft波和人工合成的合肥波作用下,线性粘滞流体阻尼器对合肥电视塔地震响应的控制分析,并对阻尼器的参数进行了优化设计。分析表明,采用最优参数的粘滞流体阻尼器可以明显减小电视塔的地震响应。 相似文献
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本文提出采用悬挂塔楼和橡胶垫层对电视塔进行联合控制 ,推导出其计算方程。工程实例表明 ,这种联合控制方式可以有效地降低电视塔塔楼的风振响应加速度 相似文献
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中央电视塔地震反应的试验研究 总被引:2,自引:0,他引:2
我国近年在北京建成了405m高的中央电视塔,该塔由钢筋混凝土塔身、塔楼和混凝土与钢天线塔杆所组成。为了研究电视塔的动力性能,在常遇地震作用下的反应,和在罕遇强烈地震作用下可能出现的破坏形态,按相似准则制作了8m高的电视塔结构模型,在大型振动台上进行了系列的试验研究。通过试验,得到了电视塔结构的动力性能,塔的地震反应以及在强烈地震作用下塔的破坏形态与机理。研究结果为该电视塔的抗震设计提供了依据。 相似文献
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悬吊质量摆对钢结构电视塔风振控制设计 总被引:3,自引:0,他引:3
本文研究在钢结构电视塔的天线段设置多个悬吊质量摆来控制电视塔的风振响应,通过计算机模拟出电视塔脉动风样本曲线,对上海青浦电视塔的风振控制进行设计和分析计算。 相似文献
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本文介绍了电视塔结构TMD风振控制的基本理论、参数分析和风洞试验,同时阐述了嘉定电视塔的TMD设计方法和构造处理。 相似文献
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脉动风作用下电视塔桅杆结构TMD控制的惯性质量与位置优化 总被引:1,自引:0,他引:1
本文以深圳市梧桐山电视塔桅杆结构风振控制项目为背景,分析了风荷载的动力特性,给出了脉动风荷载的模拟方法;采用调谐质量阻尼控制方法和线性吸振、非线性耗能的结构控制策略,对控制装置进行了系统设计,分析了装置的惯性质量效应并提出了装置的优化布置方法;在模拟脉动风荷载作用下采用振型分解和时程分析相结合的方法,对结构进行动力分析和振动控制效果计算,为TMD高耸结构抗风设计提供了依据。 相似文献
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A. K. Ghorbani‐Tanha A. Noorzad M. Rahimian 《The Structural Design of Tall and Special Buildings》2009,18(4):371-385
With a height of 435 m, Milad Tower, situated in north‐west of Tehran, Iran, would be the fourth highest telecommunication tower of the world. This tower has the largest head structure among its counterparts. Preliminary studies demonstrate that the upper part of the tower has excessive wind‐induced acceleration‐related vibrations beyond human comfort limit during wind events. In this paper, the effectiveness of tuned mass damper (TMD) on the suppression of wind‐induced motion of Milad Tower is examined through mathematical analyses. The tower is modelled as a vertical linear cantilever beam, with 57 degrees of freedom. The fluctuating wind speed is assumed to be a stochastic process which is identified by an appropriate power spectral density function. Random vibration analyses were carried out to determine response statistics. The possible application of TMDs in suppressing wind‐induced motions of the tower was investigated, and a TMD was designed to be installed at the sky dome. The results clearly show that the designed TMD has a considerable influence on the suppression of the structural response of the tower below human comfort limits. The authors believe that Milad Tower can be considered as a benchmark control problem for television and telecommunication towers by the structural control community. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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Zhiqiang ZHANG Aiqun LI Jianping HE Jianlei WANG 《Frontiers of Structural and Civil Engineering》2009,3(3):249
The Hefei TV tower is taken as an analytical case to examine the control method with a fluid viscous damper under wind load fluctuation. Firstly, according to the random vibration theory, the effect of fluctuating wind on the tower can be modeled as a 19-dimensional correlated random process, and the wind-induced vibration analysis of the tower subjected to dynamic wind load was further obtained. On the basis of the others’ works, a bi-model dynamic model is proposed. Finally, a dynamic model is proposed to study the wind-induced vibration control analysis using viscous fluid dampers, and the optimal damping coefficient is obtained regarding the wind-induced response of the upper turret as optimization objectives. Analysis results show that the maximum peak response of the tower under dynamic wind load is far beyond the allowable range of the code. The wind-induced responses and the wind vibration input energy of the tower are decreased greatly by using a fluid viscous damper, and the peak acceleration responses of the upper turret is reduced by 43.4%. 相似文献
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