丁佳龙,周游,郝冰,李远东,周正华,魏来,魏鑫,宋加密. 2023. 基于地脉动谱比的龙头山集镇局部场地特征分析. 地震学报,45(4):717−726. DOI: 10.11939/jass.20220033
引用本文: 丁佳龙,周游,郝冰,李远东,周正华,魏来,魏鑫,宋加密. 2023. 基于地脉动谱比的龙头山集镇局部场地特征分析. 地震学报,45(4):717−726. DOI: 10.11939/jass.20220033
Ding J L,Zhou Y,Hao B,Li Y D,Zhou Z H,Wei L,Wei X,Song J M. 2023. Analysis on local site characteristics of Longtoushan Town based on microtremor spectral ratio. Acta Seismologica Sinica45(4):717−726. DOI: 10.11939/jass.20220033
Citation: Ding J L,Zhou Y,Hao B,Li Y D,Zhou Z H,Wei L,Wei X,Song J M. 2023. Analysis on local site characteristics of Longtoushan Town based on microtremor spectral ratio. Acta Seismologica Sinica45(4):717−726. DOI: 10.11939/jass.20220033

基于地脉动谱比的龙头山集镇局部场地特征分析

Analysis on local site characteristics of Longtoushan Townbased on microtremor spectral ratio

  • 摘要: 地脉动法已被广泛应用于场地特征分析,本文依据鲁甸龙头山集镇老行政机关办公区、老街区及骡马口村区三个震害严重区域的场地特征地脉动,并结合各区内建筑结构特点和局部场地效应分析了龙头山集镇场地特征对震害的影响,结果表明:各测试区具有显著的场地放大效应,且存在方向性差异;参考点谱比法与H/V谱比法虽有一定差异,但两方法的优势频带基本吻合;老行政机关办公区和老街区的建筑多为砖混结构,其震害较重是由其场地显著的放大效应及共振效应共同作用引起的;老街区与骡马口村区的土木与土石结构震害较重主要是由场地放大效应引起的。

     

    Abstract: The ground pulse method has been widely used in site characteristic analysis. Based on the site characteristic ground pulse of the old administrative-office zone, the old blocks and Luomakou Village of Longtoushan Town in Ludian County, and combined with the building structure features, local site effect and earthquake damage in each area, the results show that each test area has significant site amplification effect and directional differences; there are certain differences between the reference point spectral ratio method and the H/V spectral ratio method, but the dominant frequency bands of the two methods are basically consistent; the serious earthquake damage of brick concrete structure in old administrative-office zone and old blocks is caused by the coaction of significant amplification effect and resonance effect of the site; the earthquake damage of civil and earth rock structures in the old blocks and Luomakou Village is also serious, which is mainly caused by the site amplification effect.

     

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