摘要
本文采用随机振动复模态理论，推导了三维非平稳地震载荷作用下电视塔结构的内力演变谱密度计算公式，并对洛阳电视塔、上海东方明珠电视塔的内力演变谱密度特性进行了计算研究。结果表明，洛阳电视塔与东方明珠电视塔的内力演变谱密度特性具有很大的差别，结构的高阶振型及结构的互谱密度对结构的内力具有较大的影响，因此结构的抗震设计应综合考虑这些因素对结构内力的影响效应。
Based on the complex mode analysis theory of random vibration, the computational formulas of evolutionary spectral density of the internal force for tall TV tower under three dimensional non-stationary seismic excitation have been derived, and the properties of the evolutionary spectral density of the internal force for Luoyang TV tower and the Dongfang Mingzhu TV tower in Shanghai have been studied. The results show that the difference of the properties between the two TV towers is great, and the influences of the structural high order modes as well as the structural cross spectral density on the internal force are obviously, so that this effects on structural internal force must be taken into account comprehensively in the aseismic design of tall TV tower.
出处
《建筑结构学报》
CSCD
北大核心
2000年第2期44-51,共8页
Journal of Building Structures
关键词
电视塔
非平稳随机振动
地震载荷
演变谱密度
tall TV tower
non-stationary random vibration
complex mode analysis theory
evolutionary spectral density
