基于HVSR和VRSR法的场地地震响应分析  

Site seismic response analysis based on the HVSR and VRSR methods

作　　者：李孝波 宋霖君 宣雨童 吴义文 欧阳刚垒 LI Xiaobo;SONG Linjun;XUAN Yutong;WU Yiwen;OUYANG Ganglei(School of Geological Engineering,Institute of Disaster Prevention,Sanhe 065201,China;Hebei Key Laboratory of Earthquake Disaster Prevention and Risk Assessment,Sanhe 065201,China)

机构地区：[1]防灾科技学院地质工程学院,河北三河065201 [2]河北省地震灾害防御与风险评价重点实验室,河北三河065201

出　　处：《振动与冲击》2023年第22期303-311,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(U1939209,51808118);中央高校基本科研业务费专项(ZY20215115)。

摘　　要：基于2018年松原5.7级地震的强震动记录,结合在强震台站获取的地脉动数据,采用水平与竖向谱比(horizontal-to-vertical spectral ratio,HVSR)法和速度反应谱谱比(velocity response spectral ratio,VRSR)法,探究了强震台站场地的地震响应特征。结果表明:(1)地脉动水平与竖向谱比(horizontal-to-vertical spectral ratio of microtremors,MHVR)法、强震动水平与竖向谱比(horizontal-to-vertical spectral ratio of earthquake motions,EHVR)法以及VRSR都能较好地表征出场地地震响应峰值频段,达里巴、东三家子、风华以及宝甸等4个强震台站场地的(一阶)峰值频率范围分别为0.90~1.48 Hz,0.51~0.89 Hz,0.47~0.98 Hz,0.66~1.10 Hz;(2)同一场地条件下,MHVR,EHVR以及VRSR得出的场地放大系数差别较大,MHVR的放大系数最小,VRSR的放大系数整体较EHVR大,达里巴、东三家子、风华以及宝甸等4个强震台站场地与(一阶)峰值频率对应的放大系数范围分别为2.63~8.60,3.21~8.19,3.56~8.41以及4.14~7.96;(3)与MHVR相比,EHVR和VRSR都能较好地体现出地震动高频特征,且具有大致相同的变化趋势;(4)与EHVR相比,VRSR给出的低频信息更为丰富,但较为频繁的波动变化对峰值频率的快速识别具有一定程度的影响。该研究可为依托强震记录和地脉动数据开展场地地震响应分析提供参考,具有一定的工程应用价值。The microtremor data obtained in the strong earthquake stations by using the horizontal-to-vertical spectral ratio(HVSR) and velocity response spectral ratio(VRSR) methods were used to investigate the seismic response characteristics of the strong earthquake station sites during the strong motion of the 2018 Songyuan M_(S) 5.7 earthquake.The findings indicate the following facts:(1) the horizontal-to-vertical spectral ratio of microtremors(MHVR),horizontal-to-vertical spectral ratio of earthquake motions(EHVR),and VRSR results can all characterize the peak frequency bands of site seismic responses.The(first order) peak frequency ranges of the site seismic responses on the strong motion station sites of Daliba,Dongsanjiazi,Fenghua,and Baodian are 0.90-1.48 Hz,0.51-0.89 Hz,0.47-0.98 Hz,and 0.66-1.10 Hz,respectively.(2) Under the same site conditions,the three results by the methods of MHVR,EHVR,and VRSR provide significantly different site amplification coefficients The MHVR has the smallest amplification coefficient and the VRSR has an overall larger amplification coefficient than the EHVR.The scope of site amplification coefficients of Daliba,Dongsanjiazi,Fenghua,and Baodian,which are corresponding to the(first order) peak frequency,are 2.63-8.60,3.21-8.19,3.56-8.41,and 4.14-7.96,respectively.(3) Compared with the MHVR,both the EHVR and VRSR can better reflect the high-frequency characteristics of ground motion and have approximately the same variation trend.(4) Compared with the EHVR,the VRSR provides abundant low-frequency information,but more frequent fluctuating changes have some effect on the rapid identification of peak frequencies.The study has an engineering application value and can serve as a reference for seismic site response analysis based on strong seismic records and microtremor data.

关 键 词：场地 水平与竖向谱比(HVSR) 速度反应谱谱比(VRSR) 卓越频率 放大系数 

分 类 号：TU435[建筑科学—岩土工程]