HVSR方法用于地震作用下场地效应分析的适用性研究

发布时间：2018-11-17 09:07

【摘要】：以美国Garner Valley Downhole Array(GVDA)竖向观测台阵的强震观测记录为基础,利用水平与竖向谱比(Horizontal-to-Vertical Spectral Ratio,HVSR)方法与传统谱比方法研究了多次地震作用下竖向台阵场地的波动传播规律,探讨了该场地HVSR曲线与传递函数(Transfer Function,TF)曲线的差异,综合利用频域求解一维层状场地P、SV波入射情况下场地响应的土层地震反应分析方法和合成理论地震图的波数积分法解释了二者差异可能的原因,在此基础上研究了HVSR方法应用于地震作用下场地效应分析的适用性.研究结论表明:竖向地震动场地效应是HVSR与传递函数产生差异的主要原因,竖向地震动场地效应主要是由竖向地震动中的P波成分引起的.在场地竖向放大可以忽略的频段范围内,HVSR可以作为传递函数研究地震作用下的场地效应.
[Abstract]:Based on the strong earthquake observation records of the Garner Valley Downhole Array (GVDA) vertical array in the United States, the horizontal to vertical spectral ratio (Horizontal-to-Vertical Spectral Ratio,) is used. The HVSR method and the traditional spectrum ratio method are used to study the wave propagation law of vertical array site under multiple earthquakes. The difference between the HVSR curve and the transfer function (Transfer Function,TF) curve of the site is discussed, and the one-dimensional layered site P is solved synthetically in frequency domain. The seismic response analysis method of soil layer and the wavenumber integration method of synthetic theoretical seismogram under the incident condition of SV wave explain the possible reasons for the difference between them. On this basis, the applicability of HVSR method to site effect analysis under earthquake action is studied. The results show that the site effect of vertical ground motion is the main reason for the difference between HVSR and transfer function, and the site effect of vertical ground motion is mainly caused by P wave component in vertical ground motion. HVSR can be used as a transfer function to study the site effect under seismic action in the range of negligible vertical amplification of the site.
【作者单位】：中国地震局地壳应力研究所;中国地震局地球物理研究所;美国肯塔基地质调查局;
【基金】：国家自然科学基金重大研究计划集成项目(91215301);国家自然科学基金青年项目(51208474) 中央公益型院所基本业务专项项目(ZDJ2014-07) 人社部留学人员科技活动择优项目资助
【分类号】：P315.9

【参考文献】