土—基础相互作用的辐射阻尼
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摘要
基于土体中应力波理论 ,导得土—基础在影响深度范围内土的辐射阻尼 ,提出了类比剪切群速的半空间理论阻尼比公式。其结果比经典半空间理论阻尼更符合工程实践。并由波的散射原理 ,分析了土层差异对半空间阻尼的影响效应 ,提出了工程实用计算方法。依波动理论 ,提出了基础振动的影响深度确定公式。理论计算与实测对比甚为吻合
Based on the theory of stress wave in soil,the radiation damping which is caused in soil of dynamic soil-foundation within the range of the depth of influence,and the fundamental formula of damping ratio of the elastic halfspace by the analog group shear wave velocity are presented in this paper.The analyzed results correspond better with the engineering practice than that of the classical theory of halfspace.The effect of the differential strata in halfspace on the damping is analyzed by theory of wave scattering,and the practical calculation method is presented.On the basis of the theory of wave,the formula of depth affected by the foundation vibration are involved in this study.Finally,taking some engineering project as examples,the results of theoretic calculation and the field observation have been found to be in good agreement.
Based on the theory of stress wave in soil,the radiation damping which is caused in soil of dynamic soil-foundation within the range of the depth of influence,and the fundamental formula of damping ratio of the elastic halfspace by the analog group shear wave velocity are presented in this paper.The analyzed results correspond better with the engineering practice than that of the classical theory of halfspace.The effect of the differential strata in halfspace on the damping is analyzed by theory of wave scattering,and the practical calculation method is presented.On the basis of the theory of wave,the formula of depth affected by the foundation vibration are involved in this study.Finally,taking some engineering project as examples,the results of theoretic calculation and the field observation have been found to be in good agreement.
引文
1 小理查特FE ,伍兹RD ,小霍尔JR著 .土与基础的振动 .徐攸在 ,等译 .北京 :中国建筑工业出版社 ,1976
2 严人觉 ,王贻荪 ,韩清宇 .动力基础半空间理论概论 .北京 :中国建筑工业出版社 ,1981
3 WhitmanR著 .土—结构物动力相互作用———现状与发展趋势述评 ,Applicationsofexperimentalandtheoreticalstructuraldynamics .韩国明译 .1972
4 WolfJP著 .土—结构动力相互作用 .吴世明等译 .北京 :地震出版社 ,1989
5 韩英才 .基础—土相互作用的几个问题 .建筑结构学报 ,1984,5 (6 ) :6 9～ 73
6 吴世明等 .利用表面波频谱分析测试土层波速 .地震工程与工程振动 ,1988,8(4 ) :2 7～ 32
7 潘复兰 .振动计算与隔振设计 .北京 :中国建筑工业出版社 ,1976
8 陈云敏 ,陈仁朋 ,吴世明 .多相介质波动理论的研究、应用与发展 .见 :第八届土力学及岩土工程学术会议论文集 .万国学术出版社 ,1999.5 41～ 5 44
9 杨先健 .计算基础振幅的波动应力阻尼法 .工程力学 ,1987,4(2 ) :92～ 97
10 GazetasG .Analysisofmachinefoundationvibrations :stateoftheart.SoilDynamicsandEarthquakeEngineering ,1983 ,2 (1) :2～ 42
11 考尔斯基H .固体中的应力波 .王 仁等译 .北京 :科学出版社 ,196 6
12 栾茂田 ,林 皋 .非均质地基上条形基础动力阻抗函数的简化分析模型 .振动工程学报 ,1993 ,6 (3) :2 6 3～ 2 6 8
13 YangXianjian .Groundvibrationisolatedbysoilandpilebarri ers .In :2ndIntConfRecAdvGeotEarthEngnandsoilDynStLouis ,Vol(Ⅱ ) .1991.15 5 7～ 15 6 2
14 高广运 .非连续屏障地面隔振理论与应用 :[博士学位论文 ] .杭州 :浙江大学 ,1998
15 杨先健 .基础运动的影响深度 .建筑结构 ,1987(3) :2 6 3～2 6 8
2 严人觉 ,王贻荪 ,韩清宇 .动力基础半空间理论概论 .北京 :中国建筑工业出版社 ,1981
3 WhitmanR著 .土—结构物动力相互作用———现状与发展趋势述评 ,Applicationsofexperimentalandtheoreticalstructuraldynamics .韩国明译 .1972
4 WolfJP著 .土—结构动力相互作用 .吴世明等译 .北京 :地震出版社 ,1989
5 韩英才 .基础—土相互作用的几个问题 .建筑结构学报 ,1984,5 (6 ) :6 9～ 73
6 吴世明等 .利用表面波频谱分析测试土层波速 .地震工程与工程振动 ,1988,8(4 ) :2 7～ 32
7 潘复兰 .振动计算与隔振设计 .北京 :中国建筑工业出版社 ,1976
8 陈云敏 ,陈仁朋 ,吴世明 .多相介质波动理论的研究、应用与发展 .见 :第八届土力学及岩土工程学术会议论文集 .万国学术出版社 ,1999.5 41～ 5 44
9 杨先健 .计算基础振幅的波动应力阻尼法 .工程力学 ,1987,4(2 ) :92～ 97
10 GazetasG .Analysisofmachinefoundationvibrations :stateoftheart.SoilDynamicsandEarthquakeEngineering ,1983 ,2 (1) :2～ 42
11 考尔斯基H .固体中的应力波 .王 仁等译 .北京 :科学出版社 ,196 6
12 栾茂田 ,林 皋 .非均质地基上条形基础动力阻抗函数的简化分析模型 .振动工程学报 ,1993 ,6 (3) :2 6 3～ 2 6 8
13 YangXianjian .Groundvibrationisolatedbysoilandpilebarri ers .In :2ndIntConfRecAdvGeotEarthEngnandsoilDynStLouis ,Vol(Ⅱ ) .1991.15 5 7～ 15 6 2
14 高广运 .非连续屏障地面隔振理论与应用 :[博士学位论文 ] .杭州 :浙江大学 ,1998
15 杨先健 .基础运动的影响深度 .建筑结构 ,1987(3) :2 6 3～2 6 8
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