高耸电视塔在三维非平稳地震载荷作用下的内力演变谱密度特性研究
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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.
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.
引文
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[6]王肇民.高耸结构振动控制[M].上海:同济大学出版社,1997.
[7]张文首,孙东科,林家浩.大型结构安装TMD后的简谐强迫响应数值解[J].振动与冲击,1997,16(4).
[2]宋金峰,何玉敖,刘文峰.利用旋转壳理论计算电视塔空间地反响应[J].工程力学增刊,1995:1056-1063.
[3]张良铎.电视塔的抗震设计[J].工程抗鹰,1994,3(1).
[4]方同.工程随机振动[M].北京:国防工业出版社,1995.
[5]石少卿.随机载荷作用下结构的响应、可靠性和主动控制[D].西北工业大学,1998.
[6]王肇民.高耸结构振动控制[M].上海:同济大学出版社,1997.
[7]张文首,孙东科,林家浩.大型结构安装TMD后的简谐强迫响应数值解[J].振动与冲击,1997,16(4).
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