滞后阻尼在土层时域分析中的应用
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摘要
采用滞后阻尼假定 ,分别应用时域和频域分析方法对土层的地震反应进行计算 .在简谐波和地震波激励作用下 ,通过比较时域和频域的计算结果 ,探讨了在土层时域分析中 ,如何由滞后阻尼系数形成阻尼矩阵的问题 .利用实际地震波的分析结果 ,进行回归分析 ,得到一个阻尼系数转换频率取值的经验公式 ,从而为利用滞后阻尼系数在时域中进行土层地震反应分析提供依据
Based on the assumption of hysteretic damping,seismic r esponse of soil layer was analyzed by using the methods of time domain and frequ ency domain separately.Under excitations of the harmonic and earthquake waves,ho w to evaluate the damping matrix in the time domain was discussed by comparing the results of time domain and frequency domain.From the analysis results of sev eral earthquake waves,an empirical equation,which was used to eval uate the translation f requency of damping coefficient in the time domain about hyst eretic damping,was established.So the hysteretic damping can be used more exactl y for seismic analysis of soil layers in time domain.
Based on the assumption of hysteretic damping,seismic r esponse of soil layer was analyzed by using the methods of time domain and frequ ency domain separately.Under excitations of the harmonic and earthquake waves,ho w to evaluate the damping matrix in the time domain was discussed by comparing the results of time domain and frequency domain.From the analysis results of sev eral earthquake waves,an empirical equation,which was used to eval uate the translation f requency of damping coefficient in the time domain about hyst eretic damping,was established.So the hysteretic damping can be used more exactl y for seismic analysis of soil layers in time domain.
引文
[1] WolfJP .Dynamicsoil structureinteraction[M ].EnglewoodCliffs:PrenticeHall,1985.
[2] 楼梦麟,潘旦光,范立础.土层地震反应分析中侧向人工边界影响的数值研究[J].同济大学学报(自然科学版),2003,31(7):757-761.
[3] 胡聿贤.地震工程学[M ].北京:地震出版社,1988.
[4] 谢定义.土动力学[M ].西安:西安交通大学出版社,1988
[2] 楼梦麟,潘旦光,范立础.土层地震反应分析中侧向人工边界影响的数值研究[J].同济大学学报(自然科学版),2003,31(7):757-761.
[3] 胡聿贤.地震工程学[M ].北京:地震出版社,1988.
[4] 谢定义.土动力学[M ].西安:西安交通大学出版社,1988
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