日本浅壳与上地幔地震水平与竖向加速度反应谱比的研究  

Study on a prediction equation model for H/V response spectral ratio for shallow crustal and upper mantle in Japan

作　　者：何瑾 王乐添 侯瑞彬 HE Jin;WANG Letian;HOU Ruibin(School of Civil Engineering,Shandong Jianzhu University,Ji’nan 250000,China;School of Architecture and Civil Engineering,Xihua University,Chengdu 610039,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250000 [2]西华大学建筑与土木工程学院,四川成都610039

出　　处：《世界地震工程》2024年第3期83-93,共11页World Earthquake Engineering

基　　金：国家自然科学基金项目(51578470)。

摘　　要：我国现行的抗震规范中将竖向加速度峰值设定为水平加速度峰值的0.65,这种处理方式有时低估了竖向地震动的作用,而有时又存在冗余度。本文选用5258条日本俯冲带浅壳与上地幔地震记录,综合考虑谱周期和场地条件的影响,研究建立水平与竖向加速度反应谱比模型,用于针对未知地震震源和路径信息的实际工程设计。研究表明:1)地震类型和场地类别对加速度反应谱比的影响都是显著的,因此在建立反应谱比模型时,需要考虑地震类型和场地类别的影响。2)本文模型场地项系数在接近每个场地类别的平均场地周期的对应谱周期上存在峰值,这与一维场地模型的场地放大理论一致。3)本文模型与BOMMER(2011)模型整体趋势相似,而BOMMER(2011)模型的R_(HV)在岩石、硬土和软土场地之间变化不大,该差异主要源自场地分类式不同,BOMMER(2011)基于V_(S 30)对场地分类,而V_(S 30)仅代表浅地表土层的刚度,难以全面反映场地基本特征。4)本文建立的R_(HV)模型应用于实际的工程设计,而非专门针对某一指定地震,所以没有涵盖震源以及路径的相关信息。但模型残差分析结果表明:当具有明确地震信息时,加入震级、震源深度和断层距离的参数来能够进一步优化R_(HV)模型。The current seismic design code in our country sets the vertical peak ground acceleration at 0.65 of the horizontal peak ground acceleration.This approach sometimes underestimates the effect of vertical ground motion and,at other times,introduces redundancy.In this study,we utilized 5258 records of earthquakes from the Japanese subduction zone with shallow crust and upper mantle.Considering the influence of spectral period and site conditions,we developed a model for the ratio of horizontal to vertical acceleration response spectra.This model is intended for practical engineering design without seismic source and path information.The research reveals:1)The earthquake type and site category significantly affect the acceleration response spectrum ratio.Therefore,when establishing the ratio model,the impact of earthquake type and site category needs to be considered.2)The coefficients for site effects in our model exhibit peaks near the average site period for each site category,consistent with the site amplification theory of one-dimensional site models.3)While our model shows a similar overall trend to Bommer(2011)model,theR_(HV)(ratio of horizontal to vertical)in Bommer(2011)model varies little between rock,stiff,and soft sites.This difference mainly stems from the different site classification methods;Bommer(2011)is based on V S30 for site classification,representing only the stiffness of shallow surface soil layers and difficult to comprehensively reflect site characteristics.4)The proposedR_(HV)model for practical engineering design is not specific to a particular earthquake and does not include seismic source and path parameters.However,the distribution of model residuals with respect to magnitude,fault distance,and fault depth suggests that incorporating parameters such as magnitude,source depth,and fault distance can further optimize theR_(HV)model when explicit earthquake information is available.

关 键 词：R_(HV)模型 场地效应 水平与竖向反应谱比 俯冲带 浅壳与上地幔地震 场地周期 

分 类 号：P315.9[天文地球—地震学]