拟合多阻尼比目标反应谱的高精度地震动调整方法

摘要

According to the measure index for modification effect of ground motion, both advantages and disadvantages of two methods which called Time Domain Synthesis (TDS) and Time-Frequency Analysis (TFA) are compared. Based on the calculation of quantitative relationship between Arias Intensity and absolute acceleration response spectrum, a new method combined TDS and TFA is proposed for fitting multi-damping-ratio design target spectrum. The results indicate that the new method can retain the strong non-stationary characteristic of earthquake ground motion and decrease the change of real phase difference spectrum. The simulation results of D-V-A combined spectrum shows the new method is practicable and takes precedence over the traditional methods in accuracy.%基于地震动调整效果的衡量指标比较了时域合成法和时频分析法的优缺点,在推导阿里亚斯强度与绝对加速度反应谱定量关系的基础上,将时域叠加小波函数法和时频小波分析调整法相结合,提出了一种能保留地震动强非平稳特性、对真实地震动相位差谱改动较少、能同时拟合多阻尼比目标反应谱的高精度地震动调整方法,并通过拟合美国规范D-V-A联合谱的算例证明了该方法的精度和通用性.