| 基岩弹性刚度对土层地震反应的影响 |
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| 引用本文： | 潘旦光,楼梦麟.基岩弹性刚度对土层地震反应的影响[J].地震工程与工程振动,2004,24(4):158-163. |
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| 作者姓名： | 潘旦光 楼梦麟 |
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| 作者单位： | 同济大学,土木工程防灾国家重点实验室,上海,200092;同济大学,土木工程防灾国家重点实验室,上海,200092 |
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| 基金项目： | 国家自然科学基金项目(50278070)，上海市科学技术发展基金项目(022512065)，上海市建设技术发展基金项目(A0206101) |
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| 摘 要： | 将基岩上均匀、各向同性土层的地震反应，简化为置于弹性支座上的一维剪切梁模型进行分析。将地震激励假定为白噪声谱，在随机边界激励下，主要探讨了土层与基岩2种介质间的波阻抗比、波速比、土层厚度和阻尼特性对土层地震反应的影响。计算结果表明，对于一定的土层厚度，在一定阻尼比条件下，土层和基岩的阻抗比小到一定程度时，可以将基岩假定为刚性约束，而误差可以控制在一定的范围内。
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| 关 键 词： | 随机边界 土层地震反应 波阻抗比 |
| 文章编号： | 1000-1301(2004)04-0158-06 |
Influence of rock stiffness on seismic response of layered soil |
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| Pan Danguang,Lou Menglin g,Tongji University,Shanghai ,China.Influence of rock stiffness on seismic response of layered soil[J].Earthquake Engineering and Engineering Vibration,2004,24(4):158-163. |
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| Authors: | Pan Danguang Lou Menglin g Tongji University Shanghai China |
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| Institution: | Pan Danguang,Lou Menglin g,Tongji University,Shanghai 200092,China) |
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| Abstract: | The seismic response of homogeneous 1ayered soil sited on rock, was analyzed according to shear beam model. The earthquake acceleration excitation at the base of the soil is assumed to be white noise spectrum. Under the random boundary excitation, the soil seismic response varying with wave impedance ratio, wave speed ratio, the depth of layered soil and damping coefficient were discussed. The results show that for a certain depth and damping coefficient, if the wave impedance ratio is small, the seismic response of layered soil with stiff constraint assumption is reasonable. |
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| Keywords: | random boundary seismic response of soil layer wave impedance ratio |
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