摘要
目的研究天然地震波的频率特性和场地相关性,为岩质边坡振动台试验天然地震波的选择提供依据。方法以汶川地震的24条水平地震波加速度时程记录为研究对象,根据傅里叶变换和五点滑动平均法编写Matlab的计算程序,统计地震波的主频和频带宽度;基于Matlab编写时延互相关函数计算程序,统计不同场地地震波的互相关系数,并进行分析。结果相近震中距下,土层场地与基岩场地地震波的主频和频带宽度不同;基岩场地与基岩场地地震波互相关系数的最大值和最小值均相应大于土层场地与基岩场地;相同场地间地震波的互相关系数比不同场地间地震波的互相关系数有更大概率出现在数值更大的区间内。结论不同场地间地震波的频率特性不同,同类场地间地震波的相关性强于不同场地间地震波的相关性,岩质边坡振动台试验天然地震波应选取基岩场地上台站测得的加速度时程记录。
This paper aims to study the frequency characteristics and site correlation of natural seismic,and to provide a basis for the selection of natural seismic waves in shaking table test of rock slope.Taking 24 horizontal seismic wave acceleration time history records of Wenchuan earthquake as the research object,using Fourier transform and five-point sliding average method to compile the Matlab program,the dominant frequencies and frequency band widths of seismic waves are calculated.Matlab delay cross correlation function calculation program was used to calculate the correlation coefficients of seismic waves belonging to different sites and analyze them.It is found that under the condition of similar epicentral distance,the dominant frequencies and the frequency band widths of soil seismic waves are obviously different from those of bedrock seismic waves.It is also observed that the maximum and minimum values of the correlation coefficients of seismic waves between the bedrock and the bedrock are correspondingly larger than those between the soil layer and the bedrock.The correlation coefficients of seismic waves between same sites are more likely to have higher values than those between different sites.Conclusion is that the frequency characteristics of seismic waves between different sites are different,and the correlation of seismic waves between same sites is stronger than that between different sites.When natural seismic wave acceleration time history records are selected for shaking table test of rock slope,the acceleration time history record measured by the seismic stations on the bedrock sites should be selected.
作者
郭明珠
孙海龙
GUO Mingzhu;SUN Hailong(Department of Urban Construction,Beijing University of Technology,Beijing,China,100124)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2021年第6期1013-1021,共9页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家重点研发计划项目(2018YFC1505001)。
关键词
岩质边坡
振动台试验
天然地震波
主频
频带宽度
互相关系数
rock slope
shaking table test
natural seismic wave
dominant frequency
frequency band width
correlation coefficient
