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从地震影响系数曲线的特征周期Tg出发,提出了分别取1/5Tg和1/Tg作为时域计算瑞利(Rayleigh)阻尼的两个目标频率。通过3种不同厚度的单一土层和1种多层土层模型在3条不同地震动作用下的计算,比较了基于Annie方法和本文方法确定Rayleigh阻尼的时域解,以及基于等效线性化的频域解,结果表明:两种Rayleigh阻尼形式的地表加速度峰值误差都在10%以内,地表加速度反应谱基本一致,但本文方法对土层厚度和输入的地震动不太敏感,即误差随着土层厚度及输入地震动的不同离散性很小,且应用更为简便,无需求土层的自振频率,只需要根据场地类别获得场地特征周期,就可确定Rayleigh阻尼值。
Starting from the characteristic period Tg of the seismic influence coefficient curve, two target frequencies of 1/5 Tg and 1 / Tg are taken as the time domain to calculate the Rayleigh damping. Based on the calculation of three different ground motions of three soil layers with different thicknesses and a multi-layer soil model, the time-domain solutions of Rayleigh damping based on Annie method and the method in this paper are compared. Based on the equivalent linearization The results show that the peak errors of the two types of Rayleigh damping are both within 10% and the surface acceleration response spectra are basically the same, but the method in this paper is not sensitive to the thickness of the soil and the input ground motion, The thickness of the soil layer and the input discrete ground motion are very small, and the application is simpler. The natural frequency of the soil layer is not required. The Rayleigh damping value can be determined simply by obtaining the characteristic period of the site according to the site type.