高土石坝地震反应时域分析中阻尼矩阵数值建模问题的讨论  

Discussions on numerical simulation problem of damping matrix of high-rise earth-rock filled dam seismic response analysis in time domain

作　　者：楼梦麟[1] 殷琳 邵新刚 LOU Menglin;YIN lin;SHAO Xingang(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;School of Civil and Transportation Engineering,Ningbo University of Technology,Ningbo 315211,China;School of Architecture and Art,Hebei University of Engineering,Handan 056038,China)

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]宁波工程学院建筑与交通工程学院,浙江宁波315211 [3]河北工程大学建筑与艺术学院,河北邯郸056038

出　　处：《地震工程与工程振动》2018年第6期33-42,共10页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(91315301);宁波市自然科学基金项目(2015A610303)~~

摘　　要：讨论了不同阻尼矩阵数值建模方式对时域内高土石坝地震反应计算准确性的影响。介绍了高土石坝地震反应时域分析中常用阻尼矩阵数值建模方式,通过理论分析,说明了常用阻尼矩阵的局限性。采用不同数值建模方式形成了14种比例阻尼矩阵,在时域内计算了3种不同坝高的均质土坝的线性地震反应。把计算结果与在频域内计算所得的正确结果进行对比,分析了不同比例阻尼矩阵数值建模方式对土坝地震反应计算精度的影响。数值结果表明:当高土石坝的基频低于输入地震波主要分量的激励频率时,应重视比例阻尼矩阵的建模方式和参数的选取。The effect of different numerical simulation method of damping matrix on the computational accuracy of the seismic response of high-rise earth-rock filled dams analyzed in time domain is discussed in this paper. The numerical simulation methods of damping matrix of high-rise earth-rock filled dam currently used for seismic response analysis in time domain are presented and the limitations of the methods are pointed theoretically out. The linear seismic responses of three homogeneous earth dams with different height are computed in time domain based on 14 models of proportional damping matrices formed by different numerical simulation methods. The effects of different numerical simulation methods of proportional damping matrices on the accuracies of the seismic responses of the dams are discussed according to the comparison between the above numerical results and the exact results obtained in frequency domain. The numerical results show that attention should be paid to the modeling technique and parameter selection of the proportional damping matrix when the natural frequency of high-rise earth-rock filled dam is lower than the excitation frequency of the main component of input seismic ground motion.

关 键 词：高土石坝 地震反应 比例阻尼矩阵 数值建模方式 时域计算 

分 类 号：P315.9[天文地球—地震学]