土石坝动力分析中的阻尼模型研究  

Research on Damping Models in Dynamic Analysis of Earth-rock Dams

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作  者:陶警圆[1] 田强[1] 

机构地区:[1]大连理工大学土木水利学院,辽宁大连116024

出  处:《水利与建筑工程学报》2012年第5期128-131,共4页Journal of Water Resources and Architectural Engineering

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 in- fluence on the earthquake response of earth-rock dams, especially on high ones. Finally several damping models consid- ering the frequency characteristic of earthquake wave are discussed, giving suggestions to the selection of damping models in the dynamic analysis of earth-rock dams.

关 键 词:土石坝 阻尼模型 时程分析 地震反应 频谱特性 

分 类 号:TV641[水利工程—水利水电工程]

 

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