竖向地震反应谱特征参数的拟合分析
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摘要
本文依据美国太平洋地震工程研究中心计划数据库提供的171次地震中3462组三分量地震记录为数据基础,从定性和定量两个角度研究竖向地震反应谱曲线。从定性上,研究竖向地震与水平地震反应谱曲线的异同,得出:竖向与水平向地震反应谱形状相似,但竖向比水平向拐点周期小,衰减指数小;且竖向地震反应谱与场地条件无关。从定量上,通过三个方法拟合竖向反应谱曲线,研究地面运动强度、震级、震中距对竖向地震反应谱曲线特征参数的影响,给出各设防烈度下竖向地震标准设计反应谱曲线,为我国现行规范的修订提供理论依据。
Based on 3462 records of three—component seismograms from 171 earthquakes,provided by NGA,this paper analyses vertical response spectrum from the perspective of qualitative and quantitative.Qualitatively,this paper researches the similarities and differences between vertical and horizontal response spectrum curve.The study indicates that the shape of the vertical and the horizontal response spectra are similar,at the same time,the turning point cycle of the vertical response spectra is shorter and the damping index is smaller than those of the horizontal response spectra.And the vertical response spectra are independent of the soil conditions.Quantitatively,this paper analyzes the effect of ground motion intensity,earthquake magnitude,and epicentral distance on the characteristic parameters,by fitting the vertical response spectrum curve with three methodologies.Finally the vertical standard design response spectrum curves of the different earthquake intensity are concluded,aiming to provide theoretical basis for the current seismic design codes.
引文
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