摘要
文中设计了一个装有砂土的刚性土箱,通过振动台试验研究地震动在砂土中的传播规律。土箱尺寸为2.2 m×2.2 m,砂土厚度2.0 m,将土箱底部刚接到振动台台面上,采用3条频率特性不同的地震动作为激励,采集振动台台面和不同土层深度处沿3个方向的加速度时程,通过时域分析、频率分析以及短时傅里叶分析,研究激震方向与非激震方向不同深度土层对地震动的影响规律。结果表明:随着白噪声加载次数的增加,土体的一阶频率逐渐上升并趋于稳定;在激震方向,土体会放大地震动的峰值加速度,滤除地震动高频成分;在非激震方向,土体由下到上加速度峰值先缩小后放大,地表处的加速度峰值最大。
In this paper,a rigid soil box containing sand is designed,and the propagation law of ground motion in sand is studied by shaking table test. The size of the soil box is 2.2 m × 2.2 m,and the thickness of the sand is 2.0 m.The bottom of the soil box is just connected to the vibrating table,and three ground motions with different frequency characteristics are selected as excitations,the acceleration time history along three directions at the shaking table and different soil depths is collected. Through time domain analysis,frequency analysis and short-time Fourier analysis,the impact of different depths of soil layers in the direction of excitation and non-excitation on ground motion law is studied. The results show that:as the number of white noise loading increases,the first-order frequency of the soil gradually rises and tends to be stable;in the direction of excitation,the soil will amplify the peak acceleration of ground motion and filter out high-frequency components of ground motion;in the non-excited direction,the peak acceleration from bottom to top is first reduced and then enlarged. The peak acceleration at the surface is the largest.
作者
赵征
王建涛
吕杨
ZHAO Zheng;WANG Jiantao;LV Yang(School of Civil Engineering,Tianjin Chengjian University,Tianjin 300384,China;Tianjin Key Laboratory of Protection and Reinforcement of Civil and Building Structures,Tianjin 300384,China)
出处
《自然灾害学报》
CSCD
北大核心
2022年第4期172-180,共9页
Journal of Natural Disasters
基金
国家自然科学基金项目(52178295)
中央高校基本科研业务费项目(3122018C014)。
关键词
振动台试验
砂土
地震动
刚性土箱
短时傅里叶变换
非激震方向
shaking table test
sand
earthquake motion
rigid soil box
short-time Fourier transform
the non-excited direction
作者简介
赵征(1995-),男,硕士研究生,主要从事桥梁结构抗震研究.E⁃mail:2454149508@qq.com;通讯作者:吕杨(1984-),男,教授,博士,主要从事工程结构抗震研究.E⁃mail:lvyangtju@163.com。
