首页 | 本学科首页   官方微博 | 高级检索  
     检索      

土层对地震的随机反应分析
引用本文:曾心传,秦小军.土层对地震的随机反应分析[J].地震工程与工程振动,1998,18(3):27-39.
作者姓名:曾心传  秦小军
作者单位:中国地震局地震研究所中国武汉 430071
摘    要:利用随机振动理论,本文研究了非均匀土层对地震的动力反应问题,假定土层的剪切模量随深度呈指数函数形式分布,关于基岩输入地震动加速度的功率谱密度函数,考虑了两种形式:白噪声谱和有色谱,为了比较起见,文中考虑了均匀土层的情形,数值计算表明;(1)在基岩输入地震动加速度的功率谱密度为白谱的情况下,土层的最大期望反应(相对位移,绝对加速度,剪应变)大于基岩输入地震动的功率谱为有色谱的情形;(2)在土层的上部

关 键 词:非均匀土层  随机振动  地震反应  土层

Analysis of Random Response of Soil Layer to Earthquake
Zeng Xinchuan,Qin Xiaojun.Analysis of Random Response of Soil Layer to Earthquake[J].Earthquake Engineering and Engineering Vibration,1998,18(3):27-39.
Authors:Zeng Xinchuan  Qin Xiaojun
Abstract:Using the theory of random vibration,the problem of dynamic response of the non homogeneous soil layer to earthquake is studied in the present paper.The shear modulus of the soil layer is assumed to be exponential function varying with the depth.Two cases of power spectral intensity function for the earthquake acceleration input at the base rock is considered:the white noise spectrum and the coloured spectrum.For comparison,the case of homogeneous soil layer is considered also.The numerical calculation results show that:(1)under the case that the power spectral density of the earthquake acceleration input at the base rock is the white noise spectrum,the maximum expected response(including the displacement,the acceleration,and the shear strain)of the soil layer is greater than that for the case of coloured spectrum.(2)In the upper part of the soil layer,the maximum expected values of the displacement and the acceleration for the case of non homogeneous medium are greater than that for the case of homogeneous soil layer,but in the lower part of the soil layer,the case is opposite.The maximum value of the shear for the non homo geneous soil layer is always greater than that for the homogeneous soil layer in the whole depth.(3)When both the earthquake acceleration input at the base rock and the response of the soil layer are stationary random process,the maximum expected responses are greater than that for the case of the response of the soil layer being non stationary random process,and among them,when both the earthquake acceleration input at the base rock and the response of the soil layer are non stationary random process,the maximum expected responses are the smallest.
Keywords:Non  homogeneous soil layer  Random Vibration  Earthquake response
本文献已被 CNKI 维普 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号