基于KiK-Net单场强震记录场地放大函数估计及标准差分析
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摘要
考虑场地条件的场地地震危险性分析的关键是对场地特征的量化表示。场地的放大函数是场地特征的综合反映。选取KiK-net数据库软硬两类场地,通过单场地震记录分析建立场地放大函数的概率模型,给出场地放大函数及离散性量化估计;初步分析场地放大函数与输入地震动的关系,并分析其离散性或标准差。主要结论可以概括如下:软硬两类场地的场地放大函数与输入地震动的谱加速度值密切关联;对数线性、对数非线性二次函数回归拟合场地放大函数的标准差与非条件情况下的标准差无显著差别,但是软土场地相对于硬土场地标准差较小;硬土场地当周期T<0.3s时,log10(SAF)随着log10(PSAR)的增大而减小,而T>0.3s时,log10(SAF)随着log10(PSAR)的增大基本不变或稍微增大;对于软土场地,log10(SAF)随着log10(PSAR)的增大趋于减小,特别是T<1.0s时。
The core of seismic hazard analysis is to establish quantitative relations for site characteristics,which can be incorporated into site amplification function.Selecting two Kik-net sites(i.e.,hard ground and soft site),the quantitative site amplification function and the corresponding probabilistic model are established via single-station seismic records analysis.The co-relation of site amplification function and input pseudo-spectral amplification(PSAR) is illustrated as well the variance(or standard deviation).The conclusive points can be outlined:(1) the site amplification function closely depends on input PSAR,which can be described using a linear or quadratic logarithmic relation;(2) the regression standard deviations for linear and quadratic linear equations and unconditional site amplification function are fairly close,but the standard deviation for soft site is smaller than that of hard ground;(3) at T < 0.3s for hard ground,log 10(SAF) decrease with respect to increasing log 10(PSAR),while it remains constant or slightly increases for T > 0.3s;(4) for soft site,log 10(SAF) decrease with respect to increasing log 10(PSAR) for wide period range,typically T < 1.0s.
The core of seismic hazard analysis is to establish quantitative relations for site characteristics,which can be incorporated into site amplification function.Selecting two Kik-net sites(i.e.,hard ground and soft site),the quantitative site amplification function and the corresponding probabilistic model are established via single-station seismic records analysis.The co-relation of site amplification function and input pseudo-spectral amplification(PSAR) is illustrated as well the variance(or standard deviation).The conclusive points can be outlined:(1) the site amplification function closely depends on input PSAR,which can be described using a linear or quadratic logarithmic relation;(2) the regression standard deviations for linear and quadratic linear equations and unconditional site amplification function are fairly close,but the standard deviation for soft site is smaller than that of hard ground;(3) at T < 0.3s for hard ground,log 10(SAF) decrease with respect to increasing log 10(PSAR),while it remains constant or slightly increases for T > 0.3s;(4) for soft site,log 10(SAF) decrease with respect to increasing log 10(PSAR) for wide period range,typically T < 1.0s.
引文
[1]Bazzurro P,Cornell C A.Nonlinear soil-site effects inprobabilistic seismic-hazard analysis[J].Bulletin of theSeismological Society of America,2004,94(6):2110-2123
[2]Cramer C H.Site specific seismic-hazard analysis that iscompletely probabilistic[J].Bulletin of the SeismologicalSociety of America,2003,93(4):1841-1846
[3]Tsai C-C P.Probabilistic seismic hazard analysis consideringnonlinear site effect[J].Bulletin of the Seismological Societyof America,2000,90(1):66-72
[4]Benjamin J R,Cornell C A.Probability,statistics,anddecision for civil engineers[M].New York:McGraw-Hill,1970
[5]Bazzurro P,Cornell C A.Ground-motion amplification innonlinear soil sites with uncertain properties[J].Bulletinof the Seismological Society of America,2004,94(6):2090-2109
[2]Cramer C H.Site specific seismic-hazard analysis that iscompletely probabilistic[J].Bulletin of the SeismologicalSociety of America,2003,93(4):1841-1846
[3]Tsai C-C P.Probabilistic seismic hazard analysis consideringnonlinear site effect[J].Bulletin of the Seismological Societyof America,2000,90(1):66-72
[4]Benjamin J R,Cornell C A.Probability,statistics,anddecision for civil engineers[M].New York:McGraw-Hill,1970
[5]Bazzurro P,Cornell C A.Ground-motion amplification innonlinear soil sites with uncertain properties[J].Bulletinof the Seismological Society of America,2004,94(6):2090-2109
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