Attenuation characteristic of the response spectrum platform value for 2008 Wenchuan MS8.0 earthquake
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摘要: 2008年汶川MS8.0地震获得了大量的强震动记录， 为研究反应谱特征参数衰减特性提供了重要的基础资料. 本文对已知场地条件的174个台站的记录进行研究， 计算其加速度反应谱并按照最小二乘分段拟合方法进行标定， 进而拟合了反应谱平台值的衰减关系；对比分析了水平方向与竖直方向反应谱平台值的衰减特性， 提出用“平台值的场地衰减影响系数”来定量研究不同场地类型对反应谱平台值的影响， 用“衰减曲线下降速率”来定量分析不同衰减曲线的衰减速率. 通过计算得出水平向Ⅰ, Ⅱ, Ⅲ类场地的平台值场地衰减影响系数平均值分别为0.5358， 1和1.579， 且Ⅲ类场地的加速度平台值衰减曲线的衰减速率最小.Abstract: After the 2008 Wenchuan MS8.0 earthquake, a large volume of strong motion records were acquired, which provides important basic data for the study on attenuation characteristics of seismic response spectrum parameters. This paper calculates the acceleration response spectra of strong motion records from 174 seismic stations with known site conditions. The spectra are calibrated via piecewise fitting with the least-squares method in order to fit the attenuation relationships of a response spectrum platform value. This paper also comparatively analyzes the attenuation characteristics of both vertical and horizontal response spectrum platform values so as to demonstrate how the quantitative study of site condition affects response spectrum platform values by means of the site attenuation influence coefficient of platform value. It also quantitatively analyzes the attenuation rates of different attenuation curves by means of their descending rates. The calculation results show that the site attenuation influence coefficients of horizontal platform value has an average value that is different for the three site types. The value for site type Ⅰ is 0.5358, type Ⅱ is 1;and type Ⅲ is 1.579, which is the minimum attenuation rate of the platform in all site types.
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图 1 不同场地水平向反应谱平台值衰减关系对比
Figure 1. Comparison of attenuation relationship of horizontal response spectrum platform values for different sites
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图 2 不同场地反应谱平台值衰减曲线的下降速率对比
Figure 2. Comparison of descending rates on attenuation curves of response spectrum platform values for different sites
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图 3 不同场地竖直向加速度反应谱平台值的衰减关系对比
Figure 3. Comparison of attenuation relationship of vertical response spectrum platform values for different sites
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图 4 不同场地加速度反应谱平台值衰减曲线的下降速率对比
Figure 4. Comparison of descending rates on attenuation curves of response spectrum flatform values for different sites
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图 5 竖直向与水平向加速度反应谱平台值的衰减关系对比
Figure 5. Comparison of attenuation relationship of response spectrum platform values in horizontal direction with that in vertical direction
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图 6 竖直向与水平向加速度反应谱平台值比值(V/H)随断层距R的变化
Figure 6. Ratios of response platform values between vertical and horizontal directions(V/H)versus rupture distance R
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图 7 竖直向与水平向反应谱平台值衰减曲线的下降速率对比
Figure 7. Comparison of descending rates on attenuation curves of acceleration response spectrum platform values in vertical direction with that in horizontal direction
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图 8 竖直向与水平向加速度反应谱平台值的记录值对比
Figure 8. Comparison of acceleration response spectrum platform values in vertical direction with that in horizontal direction
表 2 强震记录按场地条件和断层距分组统计表
Table 2 Statistics of strong motion records grouped in terms of site condition and rupture distance
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表 3 不同断层距区间加速度反应谱平台值均值
Table 3 Means of acceleration response spectrum platform values for different rupture distances
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表 4 不同场地加速度反应谱平台值的场地衰减影响系数
Table 4 Site attenuation influence coefficients of acceleration response spectrum platform values for different sites
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表 5 不同断层距区间加速度反应谱平台值均值
Table 5 Means of acceleration response spectrum platform values for different rupture distances
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表 6 不同场地加速度反应谱平台值的场地衰减影响系数
Table 6 Site attenuation influence coefficients of acceleration response spectrum platform values for different sites
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