土石坝动力分析中的阻尼模型研究
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摘要
阻尼模型对土石坝动力计算结果有着很重要的影响,各种响应都是阻尼的函数,能否正确估计阻尼,直接影响到结构动力分析结果的可靠性。目前在工程实际应用中,阻尼系数大多只考虑土石坝的自振特性。通过分析表明,地震波频率特性对土石坝地震响应有着重要的影响,尤其对高土石坝影响更大。通过探讨几种考虑地震动频率特性的现有的阻尼模型,为土石坝动力计算中阻尼模型的选取提出建议。
The selection of damping models has great influence to the dynamic analysis of earth-rock dams.All the responses of dams are the function of damping,so damping estimation would directly affect the reliability of dynamic analysis results.At present,only the free vibration characteristic of earth-rock dams is considered in the calculation of damping coefficient in engineerings.Analysis shows that the frequency characteristic of earthquake wave would have great influence on the earthquake response of earth-rock dams,especially on high ones.Finally several damping models considering the frequency characteristic of earthquake wave are discussed,giving suggestions to the selection of damping models in the dynamic analysis of earth-rock dams.
The selection of damping models has great influence to the dynamic analysis of earth-rock dams.All the responses of dams are the function of damping,so damping estimation would directly affect the reliability of dynamic analysis results.At present,only the free vibration characteristic of earth-rock dams is considered in the calculation of damping coefficient in engineerings.Analysis shows that the frequency characteristic of earthquake wave would have great influence on the earthquake response of earth-rock dams,especially on high ones.Finally several damping models considering the frequency characteristic of earthquake wave are discussed,giving suggestions to the selection of damping models in the dynamic analysis of earth-rock dams.
引文
[1]邹德高,徐斌,孔宪京.瑞利阻尼系数确定方法对高土石坝地震反应的影响研究[J].岩土力学,2011,32(3):797-803.
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[3]楼梦麟,殷琳.关于高土石坝地震反应分析中的阻尼模型的讨论[J].水力发电学报,2009,28(6):103-107.
[4]楼梦麟,潘旦光.滞后阻尼在土层时域分析中的应用[J].同济大学学报,2004,32(3):281-285.
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[2]丁玉琴.场地非线性地震反应分析方法及其应用研究[D].重庆:重庆大学,2010:17-18.
[3]楼梦麟,殷琳.关于高土石坝地震反应分析中的阻尼模型的讨论[J].水力发电学报,2009,28(6):103-107.
[4]楼梦麟,潘旦光.滞后阻尼在土层时域分析中的应用[J].同济大学学报,2004,32(3):281-285.
[5]Hudson M,Idriss I M,Beikae.User manual for QUAD4m:Acomputer program to evaluate the seismic response of soilstructures using finite element procedures and incorporating acompliant base[D].Berkeley:University of California,1994.
[6]朱百里,沈珠江.计算土力学[M].上海:上海科学技术出版社,1990.
[7]Clough R W,Penzien J.Dynamics of structures[M].NewYork:McGraw-Hill,Inc.,1993.
[8]顾淦臣,沈长松,岑威钧.土石坝地震工程[M].北京:中国水利水电出版社,2009.
[9]迟世春,陈崇茂,张宗亮.土石坝料动力实验数据的一种统计公式[J].水利与建筑工程学报,2011,9(6):5-8.
[10]中华人民共和国国家经济贸易委员会.DL5073-2000.水工建筑物抗震设计规范[S].北京:中国电力出版社.2000:18-19
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