反应谱控制选波的地震动时频非平稳特性差异性分析

Analysis of the Difference of Time-Frequency NonStationary Characteristics of Ground Motion of Selected Seismic Waves Controlled by Response Spectrum

时程分析法中地震波的选取关乎结构抗震分析结果是否准确,基于规范反应谱进行选波分析,研究不同选波控制指标下所选出的地震波在时域、频域等方面的特性及误差大小,并进行工程验证。结果表明:采用拟合反应谱选波方法所选的地震动在时、频域上特性差异较大,是导致时程分析法中结构响应差异性较大的主要原因,且选用更为严格的控制指标并不能有效降低所选出地震动时频非平稳之间的差异性。

The selection of seismic waves in time history analysis is related to the accuracy of seismic analysis results.Based on the standard response spectrum,wave selection analysis is carried out to study the characteristics and error size of seismic waves selected under different wave selection control indexes in time domain and frequency domain,and engineering verification is carried out.The results show that the characteristics of the ground motion selected by the wave selection method with the fitted response spectrum vary greatly in the time and frequency domain,which is the main reason for the large difference in the structural response in the time history analysis method,and the selection of more strict control indexes cannot effectively reduce the difference between the selected time-frequency non-stationary ground motion.