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中文摘要：
土石坝地震反应分析中,瑞利阻尼系数在很大程度上影响计算的精度。改进了阻尼系数的确定方法,采用不同阻尼系数对土石坝进行了时域动力分析,并与频域计算结果进行了比较。结果表明：当坝高超过100 m后,采用结构基频确定瑞利阻尼系数的方法高估了结构的阻尼,导致结构的动力反应偏小;改进后的方法能较好地反映结构的阻尼特性。通过对拟建的双江口直心墙土石坝进行动力分析,进一步验证了改进阻尼系数确定方法的合理性。
英文摘要：
Rayleigh damping coefficients can influence the result to a great extent for seismic response analysis of earth-rock dam.The method is improved for calculating Royleigh damping coefficients.A series of dynamic analyses are performed in time domain by using different methods for caculating damping respectively and compared with dynamic analyses in frequency domain.The results show that,with the height of earth-rock dam over 100m,the damping coefficient calculated by the first frequency of the structure overestimated the damping in all frequency regions and resulting in underestimation of response;the improved method for caculating damping can reasonably reflect the damping properties of the dam.The dynamic response of Shuangjiangkou dam is analyzed by different methods,for caculating damping to validate the rationality of the improved method.
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