基于HVSR和VRSR法的场地地震响应分析

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (22) : 303-311.

论文

李孝波1,2，宋霖君1,2，宣雨童1,2，吴义文1,2，欧阳刚垒1,2

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Site seismic response analysis based on the HVSR and VRSR methods

LI Xiaobo1, 2, SONG Linjun1, 2, XUAN Yutong1, 2, WU Yiwen1, 2, OUYANG Ganglei1, 2

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文章历史 +

摘要

本文基于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法（HVSR）和速度反应谱谱比法（VRSR），探究了强震台站场地的地震响应特征。结果表明：（1）MHVR、EHVR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。本文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。

Abstract

The microtremor data obtained from the strong earthquake stations 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 based on the strong motion of the 2018 Songyuan Ms 5.7 earthquake. The findings indicate the following (1) the MHVR (horizontal-to-vertical spectral ratio of microtremors), EHVR (horizontal-to-vertical spectral ratio of earthquake motions), and VRSR results can all characterize the peak frequency bands of site seismic response. The (first order) peak frequency ranges of Daliba, Dongsanjiazi, Fenghua, and Baodian, which are strong motion station sites, were 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 of MHVR, EHVR, and VRSR provide significantly different site amplification coefficients, and the MHVR having the smallest amplification coefficient and VRSR having an overall larger amplification coefficient than EHVR. The scope of site amplification coefficients of Daliba, Dongsanjiazi, Fenghua, and Baodian, which are corresponding to (first order) peak frequency, were 2.63 ~ 8.60, 3.21 ~ 8.19, 3.56 ~ 8.41, and 4.14 ~ 7.96, respectively. (3) Compared with MHVR, both EHVR and VRSR can better reflect the high-frequency characteristics of ground motion and have approximately the same variation trend. (4) When compared with EHVR, VRSR provides abundant low-frequency information, but more frequent fluctuations have some bearing on the rapid identification of peak frequencies. This 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.

导出引用

李孝波1,2，宋霖君1,2，宣雨童1,2，吴义文1,2，欧阳刚垒1,2. 基于HVSR和VRSR法的场地地震响应分析[J]. 振动与冲击, 2023, 42(22): 303-311

LI Xiaobo1, 2, SONG Linjun1, 2, XUAN Yutong1, 2, WU Yiwen1, 2, OUYANG Ganglei1, 2. Site seismic response analysis based on the HVSR and VRSR methods[J]. Journal of Vibration and Shock, 2023, 42(22): 303-311

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