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采用随机振动复模态理论 ,对北京电视塔模型在三维非平稳地震激励下的响应特性进行了计算研究。结果表明 :塔下部结构与上部结构响应特性有较大的差别 ,塔身、塔楼、混凝土桅杆响应的演变谱密度主要分布在系统的第二、第四频率上 ,而钢结构桅杆的前六阶频率上均有较大的不可忽视的响应演变谱密度 ,因此对电视塔结构的抗震设计应根据响应的特点考虑高阶振型的影响。
The response characteristics of Beijing TV Tower under three-dimensional non-stationary seismic excitation are calculated using random vibration complex mode theory. The results show that the response characteristics of the substructure and the superstructure are quite different. The evolved spectral density of the tower, tower and concrete mast are mainly distributed on the second and fourth frequencies of the system, while the first six orders of the steel mast Therefore, the seismic design of TV tower should consider the influence of high-order modes according to the characteristics of response.