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通信塔通常架设在已有的建筑物上。在地震中,建在屋顶上高耸的通信塔鞭梢效应比较显著,常常受到严重的破坏,而通信塔的损坏将会影响震后救灾工作的开展。本文基于通信塔的实际震例,分析了通信塔出现鞭梢效应的主要原因。采用振型分解反应谱法和线性时程分析法,分析了位于不同层数框架结构上的两个通信塔的地震作用。结果表明通信塔和框架结构的自振周期接近时是鞭梢效应最容易发生的时刻,两者的一阶特征周期接近时鞭梢效应最大;场地特征周期越大,通信塔的地震效应越大。
Communication towers are usually erected on existing buildings. During the earthquake, the whiplash effect of towering communication tower built on the roof was rather obvious and was often severely damaged. However, the damage to the communications tower will affect the relief work after the earthquake. Based on the actual earthquake cases of communication towers, this paper analyzes the main causes of whiplash effect in communication towers. Using the mode decomposition decomposition method and the linear time history analysis, the seismic actions of two communication towers located on different levels of frame structure are analyzed. The results show that when the natural vibration period of the communication tower and the frame structure is close, the whiplash effect is most likely to occur, and the whiplash effect is the greatest when the first-order eigenvalues are close to each other. The greater the characteristic period of the field, the larger the seismic effect of the communication tower .