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在高压输电塔中安装粘弹性阻尼器会显著降低塔线体系的风振响应,针对附加阻尼器后输电塔的阻尼特性的量化研究,对输电塔基于性能的减振设计和加固都具有非常重要的理论意义。本文以附加粘弹性阻尼器的高压输电塔结构为研究对象,以规范提出的基于应变能的估算公式为理论依据,提出了一种基于输电塔层概念的附加等效阻尼比的计算方法,并通过有限元模型对比分析了实际安装阻尼器和采用等效阻尼比计算的输电塔塔顶位移。仿真结果表明,本文提出的等效阻尼比的计算方法精度较高,在多种工况下误差均不超过5%。 相似文献
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大跨越输电塔线体系风振响应的时域分析 总被引:4,自引:0,他引:4
以规划中的世界第一高塔-舟山大跨越输电塔为工程背景,建立了塔线耦合体系的空间有限元模型,对体系的风振响应进行了时域分析,同时对输电塔线体系进行了气动弹性模型的风洞试验。通过理论计算和试验研究,将输电塔的响应分解为共振分量与背景分量,并分别考虑了输电线对这两部分分量的影响。针对背景与共振响应各自的特征,进一步提出了塔线体系的简化计算方法:背景分量的计算可以应用准静态假定,采用方差分析法得出;将塔线体系等效为悬吊摆系统,从而简化了共振分量的计算。上述两部分计算结果相叠加,即可得到塔线体系真实的风振响应。 相似文献
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钢电视塔采用悬挂水箱和粘弹性阻尼器风振控制的实测研究 总被引:3,自引:0,他引:3
本文在理论研究的基础上 ,对黑龙江广播电视塔采用悬挂水箱减振器PTTMD和粘弹性阻尼器VED进行联合风振控制进行了现场实测研究 ,并基于现场实测数据分析 ,对结构风振控制效果的有效性进行了评价 相似文献
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考虑塔-线耦合作用的体系风振响应以及对应情况下的输电塔等效风荷载的风振系数取值是输电塔抗风设计的基础,结合某220kV输电线路一塔两线实例,通过气弹性风洞试验和有限元数值模拟的方式,研究输电塔在考虑导、地线耦合作用下的风振响应规律,计算其对应的输电塔等效风荷载的风振系数,并与我国现行规范中的相关取值进行对比,结果表明:横担和输电线的存在使得塔身中上部的风振系数明显增大,在进行输电塔设计时需考虑其影响;建议采用《建筑结构荷载规范》(GB 50009—2012)和《高耸结构设计规范》(GB50135—2006)来计算风振系数时,对横担位置进行修正或单独考虑,而《架空输电线路荷载规范》(DLT5551—2018)更适用于输电塔类结构的风振系数的计算。 相似文献
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本文分析并指出了《架空送电线路杆塔结构设计技术规定》(DL/T5154-2002)中关于计算输电塔风振系数条文中存在的问题,引进了基于输电塔气弹模型风洞试验数据得到的输电塔顺风向1阶广义风荷载谱模型,并对其进行了地貌和振型修正。详细推导了基于修正的输电塔1阶广义风荷载谱计算其风振系数的方法,采用该方法计算了某大跨越输电塔的风振系数,并且与基于准定常理论采用Daven-port谱和规范方法计算得到的风振系数进行比较,所得结论具有重要的参考价值,可以直接为输电线路工程设计提供借鉴。 相似文献
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大跨越输电线路塔的振动控制 总被引:7,自引:0,他引:7
本文以正在建设中的国内高度最高、跨越距离最长的江阴长江 5 0 0kV大跨越输电线路为工程背景 ,进行随机风振下的MTMD和粘弹性阻尼器VED振动控制的设计和时程分析 ,由于较好的实现了阻尼 ,其减振效果较为显著 相似文献
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Xin Chen Aiqun Li Zhiqiang Zhang Liang Hu Peng Sun Zhong Fan Xianming Liu 《The Structural Design of Tall and Special Buildings》2020,29(4)
With five sub towers and a maximum height of 246.8 m, the Beijing Olympic Tower (BOT) is a landmark of Beijing. The complex structural properties and slenderness of the BOT render it prone to wind loading. As far as the wind‐induced performance of this structure is concerned, this paper thus aims at a tuned mass damper‐based mitigation system for controlling the wind‐induced acceleration response of the BOT. To this end, the three‐dimensional wind loading of various wind directions are simulated based on the fluctuating wind force obtained by the wind tunnel test, by which the wind‐induced vibration is evaluated in the time domain by using the finite element model. A double‐stage pendulum tuned mass damper (DPTMD), which is capable of controlling the long period dynamic response and requires only a limited space of installation, is optimally designed at the upper part of the tower. Finally, the wind‐induced response of the structure with and without DPTMD is compared with respect to various wind directions and in both the time and frequency domains. The comparative results show that the wind‐induced accelerations atop the tower with the wind directions of 45, 135, 225, and 315° are larger than those with the other directions. The DPTMD significantly reduces the wind‐induced response by the maximum acceleration reduction ratio of 30.05%. Moreover, it is revealed that the control effect varies noticeably for the five sub towers, depending on the connection rigidity between Tower1 and each sub tower. 相似文献
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Experimental parametric study on wind‐induced vibration control of particle tuned mass damper on a benchmark high‐rise building 下载免费PDF全文
A particle tuned mass damper system is an integration of tuned mass damper and particle damper. The damping performance of such device is investigated by an aero‐elastic wind tunnel test on a benchmark high‐rise building. The robustness of the system is studied by comparing the damping performance to that of a traditional tuned mass damper, and the results show that the damper has excellent and steady wind‐induced vibration control effects. Meanwhile, the parameters (filling ratio, mass ratio, and mass ratio of the container to particles), which have great influence on the vibration reduction performance of the system, are also analyzed, and it is found that the particles filling ratio plays the most important role in deciding the damping effects of the dampers. There exists an optimum filling ratio and mass ratios in which the damper can reach the best damping state. Proper parameter selections can greatly improve the damping performance. 相似文献
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本文介绍了悬挑53·17m的合肥奥体中心钢网架的风洞试验及振动性能,同时给出了新型筒式粘弹性阻尼器的试验结果及利用这种阻尼器的风振控制。 相似文献
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对某标志塔进行了动力特性分析,应用半主动质量驱动器(MR-TMD)系统,采用Matlab软件编制了半主动减振控制分析程序,分析比较了在模拟脉动风荷载作用下无控、被动TMD和MR-TMD控制下塔的响应,仿真结果表明,MR-TMD作为一种半主动质量驱动器能有效降低标志塔的风振反应。 相似文献