地震动频谱特性及与隔震结构损伤相关性研究

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摘要该文对地震动频谱特性的描述方法及频谱特性与结构损伤的相关关系进行了研究。首先，提出了Fourier谱强度频率匹配度、结构振型频率影响系数和类共振放大系数的概念及计算公式；然后，以基础隔震结构作为弹塑性时程分析模型，计算结构整体损伤指数；最后，分别从卓越频率、三大峰值频率和平均频率三个角度研究地震动频谱特性与结构损伤的相关性。研究结果表明：地震动频谱特性对结构造成的损伤与结构各阶振型频率有关，且第一振型频率影响最大。Fourier谱强度频率匹配度越大，表明结构发生类共振的概率越大，造成隔震层和上部结构的损伤也越大。类共振放大系数反映频谱特性对结构造成损伤的程度，平均频率类共振放大系数与结构损伤的相关性最好，用平均频率能够较好地描述地震动的频谱特性。

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	杜永峰1
	2
	王亚龙1
	李虎1
	方登甲1
	时晨1

关键词 ：平均频率, 振型频率, 频谱特性, 损伤指数, Fourier谱强度频率匹配度, 类共振放大系数

Abstract：The spectral characteristics of ground motion and the correlation between spectral characteristics and structural damage were studied.The concept and calculation formula were proposed for the frequency matching degree of Fourier spectral intensity, structural modal frequency influence coefficient and magnification factor of pseudo-resonance.A base-isolated structure model for elastic-plastic history analysis was established and used to calculate the structure overall damage index.The correlation between the spectral characteristics and structure damage was studied in regard to the dominant frequency, three major peak frequencies and average frequency.The results show that the structural damage caused due to spectral characteristics is related to the modal frequency of the structure, and the influence of the first modal frequency is the most significant.The greater the frequency matching degree of Fourier spectral intensity, the greater the possibility of structure pseudo-resonance and the greater the damage index of the isolation layer and the upper structure.The magnification factor of pseudo-resonance reflects the damage degree of the structure caused due to spectral characteristics.It is also found that the average frequency is rather good to represent the spectral characteristics of ground motion.

Key words： average frequency modal frequency spectral characteristics damage index frequency matching degree of Fourier spectral intensity；magnification factor of pseudo-resonance

收稿日期: 2018-01-09 出版日期: 2019-05-15

引用本文:

杜永峰1,2，王亚龙1，李虎1，方登甲1，时晨1. 地震动频谱特性及与隔震结构损伤相关性研究[J]. 振动与冲击, 2019, 38(10): 156-161.
DU Yongfeng1,2,WANG Yalong1,LI Hu1,FANG Dengjia1,SHI Chen1. Spectral characteristics of ground motion and its correlation with the damage of base-isolated structure. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(10): 156-161.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2019/V38/I10/156

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