Article(id=1244334015289868727, tenantId=1146029695717560320, journalId=1243988319449690156, issueId=1244334009858240758, articleNumber=null, orderNo=null, doi=10.19994/j.cnki.WEE.2025.0064, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1736870400000, receivedDateStr=2025-01-15, revisedDate=1744128000000, revisedDateStr=2025-04-09, acceptedDate=null, acceptedDateStr=null, onlineDate=1774601947852, onlineDateStr=2026-03-27, pubDate=1759248000000, pubDateStr=2025-10-01, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1774601947852, onlineIssueDateStr=2026-03-27, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1774601947852, creator=13701087609, updateTime=1774601947852, updator=13701087609, issue=Issue{id=1244334009858240758, tenantId=1146029695717560320, journalId=1243988319449690156, year='2025', volume='41', issue='4', pageStart='1', pageEnd='211', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1774601946558, creator=13701087609, updateTime=1774602401281, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1244335917167657884, tenantId=1146029695717560320, journalId=1243988319449690156, issueId=1244334009858240758, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1244335917167657885, tenantId=1146029695717560320, journalId=1243988319449690156, issueId=1244334009858240758, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=106, endPage=117, ext={EN=ArticleExt(id=1244334018720809426, articleId=1244334015289868727, tenantId=1146029695717560320, journalId=1243988319449690156, language=EN, title=Vertical ground motion acceleration response spectrum prediction model based on deep neural networks, columnId=null, journalTitle=World Earthquake Engineering, columnName=null, runingTitle=null, highlight=null, articleAbstract=

Vertical ground motions have a significant impact on the seismic response of engineering structures, making the development of reliable vertical ground motion prediction models an important topic in the field of earthquake engineering. Traditional ground motion predictions are primarily based on actual strong motion records, using least squares regression to derive seismic motion parameter prediction models. However, conventional least squares regression often assumes linear relationships or predefined functional forms between variables, which may fail to fully capture the complex nonlinear relationships inherent in seismic data. In contrast, deep learning models can learn patterns from data and provide higher prediction accuracy for complex data distributions. In this study, deep learning methods were applied, and 9 953 vertical ground motion records from the NGA-West2 database were selected for model training and prediction. The self-DNN vertical seismic response spectrum prediction model was established and its performance was compared with traditional prediction models and a DNN neural network models. The results indicate that the vertical seismic response spectrum prediction model established using deep learning algorithms achieves high accuracy and delivers excellent predictive performance. These findings and analyses provide valuable references for vertical seismic response spectrum prediction and structural seismic design.

, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, authorCompany=null, fund=null, authors=null, authorsList=Mingyu GAO, Maosheng GONG, Zhanxuan ZUO, Jia JIA, Bo LIU, Xiaomin WANG), CN=ArticleExt(id=1244334028254462670, articleId=1244334015289868727, tenantId=1146029695717560320, journalId=1243988319449690156, language=CN, title=基于深度神经网络的竖向地震动加速度反应谱预测模型, columnId=1244334010969731326, journalTitle=世界地震工程, columnName=常规论文, runingTitle=null, highlight=null, articleAbstract=

竖向地震动对工程结构地震响应有重要影响,发展可靠的竖向地震动预测模型是地震工程领域的一项重要课题。传统的地震动预测主要基于实际强震动记录,采用最小二乘回归方式得到地震动参数预测模型,但是传统最小二乘回归通常假设变量之间是线性关系或预设的函数形式,这可能无法完全捕捉地震数据中复杂的非线性关系,而深度学习模型能够从数据中学习规律并对复杂的数据分布提供更高的预测精度。因此通过深度学习方法,基于NGA-West2数据库选取了9 953条竖向地震动记录,然后计算反应谱并进行模型训练与预测,建立了Self-DNN竖向地震动反应谱预测模型,并与传统预测模型以及DNN神经网络模型进行了对比。结果表明,本文基于深度学习算法建立的竖向地震动反应谱预测模型具有较好的可靠性和准确性,可以取得良好的预测效果。研究结果可以为竖向地震动反应谱预测和结构抗震设计等工作提供参考。

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公茂盛(1976—),男,研究员,博士,主要从事地震工程研究。E-mail:
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高铭宇(1999—),男,硕士生,主要从事地震工程研究。E-mail:

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基于深度神经网络的竖向地震动加速度反应谱预测模型
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高铭宇 1, 2 , 公茂盛 1, 2 , 左占宣 1, 2 , 贾佳 1, 2 , 刘博 1, 2 , 王晓敏 1, 2
世界地震工程 | 常规论文 2025,41(4): 106-117
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世界地震工程 | 常规论文 2025, 41(4): 106-117
基于深度神经网络的竖向地震动加速度反应谱预测模型
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高铭宇1, 2 , 公茂盛1, 2 , 左占宣1, 2, 贾佳1, 2, 刘博1, 2, 王晓敏1, 2
作者信息
  • 1.中国地震局工程力学研究所 地震工程与工程振动重点实验室,黑龙江 哈尔滨 150080
  • 2.地震灾害防治应急管理部重点实验室,黑龙江 哈尔滨 150080
  • 高铭宇(1999—),男,硕士生,主要从事地震工程研究。E-mail:

通讯作者:

公茂盛(1976—),男,研究员,博士,主要从事地震工程研究。E-mail:
Vertical ground motion acceleration response spectrum prediction model based on deep neural networks
Mingyu GAO1, 2 , Maosheng GONG1, 2 , Zhanxuan ZUO1, 2, Jia JIA1, 2, Bo LIU1, 2, Xiaomin WANG1, 2
Affiliations
  • 1.Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China
  • 2.Key Laboratory of Earthquake Disaster Mitigation, Ministry of Emergency Management, Harbin 150080, China
出版时间: 2025-10-01 doi: 10.19994/j.cnki.WEE.2025.0064
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竖向地震动对工程结构地震响应有重要影响,发展可靠的竖向地震动预测模型是地震工程领域的一项重要课题。传统的地震动预测主要基于实际强震动记录,采用最小二乘回归方式得到地震动参数预测模型,但是传统最小二乘回归通常假设变量之间是线性关系或预设的函数形式,这可能无法完全捕捉地震数据中复杂的非线性关系,而深度学习模型能够从数据中学习规律并对复杂的数据分布提供更高的预测精度。因此通过深度学习方法,基于NGA-West2数据库选取了9 953条竖向地震动记录,然后计算反应谱并进行模型训练与预测,建立了Self-DNN竖向地震动反应谱预测模型,并与传统预测模型以及DNN神经网络模型进行了对比。结果表明,本文基于深度学习算法建立的竖向地震动反应谱预测模型具有较好的可靠性和准确性,可以取得良好的预测效果。研究结果可以为竖向地震动反应谱预测和结构抗震设计等工作提供参考。

竖向地震动  /  地震动反应谱  /  神经网络  /  深度学习  /  预测模型

Vertical ground motions have a significant impact on the seismic response of engineering structures, making the development of reliable vertical ground motion prediction models an important topic in the field of earthquake engineering. Traditional ground motion predictions are primarily based on actual strong motion records, using least squares regression to derive seismic motion parameter prediction models. However, conventional least squares regression often assumes linear relationships or predefined functional forms between variables, which may fail to fully capture the complex nonlinear relationships inherent in seismic data. In contrast, deep learning models can learn patterns from data and provide higher prediction accuracy for complex data distributions. In this study, deep learning methods were applied, and 9 953 vertical ground motion records from the NGA-West2 database were selected for model training and prediction. The self-DNN vertical seismic response spectrum prediction model was established and its performance was compared with traditional prediction models and a DNN neural network models. The results indicate that the vertical seismic response spectrum prediction model established using deep learning algorithms achieves high accuracy and delivers excellent predictive performance. These findings and analyses provide valuable references for vertical seismic response spectrum prediction and structural seismic design.

vertical ground motion  /  ground motion response spectra  /  neural network  /  deep learning  /  prediction model
高铭宇, 公茂盛, 左占宣, 贾佳, 刘博, 王晓敏. 基于深度神经网络的竖向地震动加速度反应谱预测模型. 世界地震工程, 2025 , 41 (4) : 106 -117 . DOI: 10.19994/j.cnki.WEE.2025.0064
Mingyu GAO, Maosheng GONG, Zhanxuan ZUO, Jia JIA, Bo LIU, Xiaomin WANG. Vertical ground motion acceleration response spectrum prediction model based on deep neural networks[J]. World Earthquake Engineering, 2025 , 41 (4) : 106 -117 . DOI: 10.19994/j.cnki.WEE.2025.0064
可靠的地震动参数预测是地震动参数区划、工程抗震设计的重要基础,对于地震安全评估、地震灾害分析,以及城市结构和基础设施的设计至关重要。前人研究较多关注在水平地震动,但是对于大跨度结构和超高层建筑,竖向地震动的影响较大,在实际工程中不可忽略。一般而言,竖向地震动预测的传统研究方法通常包括两种:①用竖向地震动与水平地震动的峰值比或谱比V/H来间接反映竖向地震动的作用;②把竖向地震动作为独立变量来进行分析。但是,由于非弹性衰减和非线性场地效应的影响[1]V/H有时不能完全捕捉到竖向与水平地震动之间的诸多差异,有必要对竖向地震动参数进行单独预测。传统回归方法主要采用非线性最小二乘法确定地震震级、震源特性、传播介质、场地中各个参数与地震动参数之间规律关系,并建立预测方程,从而对地震动参数进行预测。
传统的最小二乘回归方法通常假设变量之间是线性关系或预设的函数形式。STEWART等[2]计算了活动构造区域浅层地壳地震的竖向地震动反应谱,并采用传统回归方法建立了地面运动预测方程中的SBSA16模型。该模型共考虑3项分别为震源项、路径项和场地项。以矩震级MW、断层距RJB、场地VS30和断层类型作为自变量。该模型适用于地震矩震级MW为3~8、断层距RJB为0~300 km的地震,VS30的适用范围为200~1 500 m/s。BOZORGNIA等[3]选用NGA-West2数据库中的竖向地震动数据,建立了地面运动预测方程中的CB16模型。该模型是NGA模型中考虑因素最全面的模型,主要考虑了震级、断层距、断层类型、上盘效应、场地条件、盆地效应、震源深度、破裂面倾角、非弹性衰减等因素,适用范围:MW为3.3~8.5,Rrup为0~300 km,VS30为150~1 500 m/s。李宁等[4]基于太平洋地震工程研究中心(Pacific Earthquake Engineering Research Center,PEERC)数据库,研究了地震动竖向与水平加速度分量峰值比aV/aH与矩震级、断层距、场地条件和断层类型的统计规律,给出了aV/aH的合理取值。李恒等[5]采用全球范围128次地震的3 235组三分量强地面运动记录,分析了加速度竖向分量反应谱与水平分量反应谱的比值V/H的整体特征,研究了V/H随震级、震中距、局部场地条件和震源机制的变化关系。然而,使用最小二乘回归法通常在小规模数据集上表现良好,但面对大规模数据时可能无法有效利用数据的潜在信息,因而可能无法完全捕捉地震数据中复杂的非线性关系,特别是在数据不均衡的情况下,其泛化能力弱。
近年来,很多学者利用机器学习对地震动参数进行了合理预测,JI等[6]主要应用NGA-West2数据库,以矩震级、断裂类型、断裂深度等参数作为震源项参数,以断层距和破裂长度作为传播介质项参数,以等效剪切波速作为场地项参数,建立了地震动累积绝对速度的神经网络模型。WITHERS等[7]采用南加州地震中心(Southern California Earthquake Center,SCEC)地震动记录,选取了矩震级、断层距、等效剪切波速和断层类型作为输入参数,仅建立了包含一个隐藏层的神经网络模型,用来预测地震动的幅值特征,对于一些缺乏地震动记录的地区,采用人工模拟地震动,并用NGA-West2中的记录对神经网络模型预测性能进行一定的评估,指出对于缺乏地震动记录的地区,可利用模拟地震动来生成大量用于深度学习的数据样本。余聪等[8]主要选用日本K-NET数据集,并选取加速度幅值、速度幅值、位移幅值、破坏烈度、傅里叶谱幅值、速度平方积分、累积绝对速度和阿里斯亚烈度8个参数,建立了支持向量机地震动峰值预测模型,预测效果良好。DERRAS等[9]选用日本KiK-net作为机器学习数据库,并选取震级、震源深度、震中距、场地共振频率和VS30作为输入参数,峰值地面加速度PGA作为输出参数,设置了一个3层的神经网络,每个隐藏层都包含20个神经元,并进行了一定的超参数设置和优化算法选取,得到了预测结果,并提出了机器学习方法是一种很有价值的对地震动参数进行预测的方法,可以和经典回归方法共同使用。贾佳等[10]基于机器学习算法对土耳其地震中获得的660组地震动记录的显著持时进行预测,建立了预测模型并开展了残差分析,并将预测模型与传统持时预测公式预测结果对比,预测效果良好。靳超越等[11]筛选处理了2021年云南漾濞地震的地震动记录,基于机器学习算法对前震和余震下地震动记录进行特征提取,并根据提取得到的特征母波时程来模拟主震的强震动记录。朱景宝等[12]基于日本K-NET(Kyoshin net)地震动数据库中震级3.0~7.5级的地震事件,建立了用于震级估算的深度卷积神经网络DCNN-M模型,能够实时对震级进行估算。李逸群[13]建立全球范围的余震数据库,并在此基础上开展基于深度神经网络的余震衰减关系的预测研究,并总结归纳了俯冲带板间余震和俯冲带板内余震地震动衰减关系规律,预测结果可靠。
通过上述分析可以发现,针对地震动反应谱进行预测研究多是针对水平地震动并且回归方法较多采用传统最小二乘回归,采用深度学习神经网络方法对竖向地震动反应谱进行预测的研究较少。基于此,本文选取NGA-West2中9 953条竖向地震动记录,参考SBSA16模型,选取矩震级和断层类型作为震源项,矩震级和断层距作为路径项,矩震级、断层类型、断层距和VS30作为场地项进行输入,利用深度学习算法建立了竖向地震动反应谱预测模型,并与传统经验公式及DNN模型预测结果进行对比,验证了本文建立的基于深度学习竖向地震动反应谱预测模型具有可靠性和合理性。
在地震动数据的选取时遵循以下3个原则:①地震动记录应包含震级、距离及场地等完整相关参数信息;②地震矩震级MW为4.0~8.0,断层距RJB为0~300 km;③单次地震事件的地震动记录数量≥4条。基于上述原则,本文从美国NGA-West2数据库中选取了9 953条地震动记录,每条记录包含3个分量,本文只对竖向分量开展研究。这些地震动记录总共来自全球204次地震,其矩震级-距离分布、矩震级-场地VS30分布如图1所示。由图可知,本文所选地震动记录矩震级MW主要集中在4.0~7.0,而在7.0~8.0的地震动记录相对偏少;断层距RJB主要集中分布在5~300 km,5 km以下的记录相对偏少;场地VS30主要集中分布在200~800 m/s。本文首先对这些地震动记录分别计算了阻尼比为5%的加速度反应谱,其次建立了Self-DNN预测模型,并选取周期T=0 s时的加速度反应谱谱值PGA以及周期T=0.2、1.0、3.0 s时的加速度反应谱谱值Sa(acceleration response spectrum value)这几个指标作为代表项进行分析。
深度学习网络[14]是指利用多层神经网络模型进行特征学习和模式识别的计算,从大量数据中寻求参数特征和参数之间的客观规律,并利用不断调整权重和设定激活函数进一步学习到输入参数与输出参数之间的非线性关系。DNN神经网络的主要优点在于其强大的特征学习能力和非线性建模能力,能够通过多层隐藏层自动提取数据的多层次特征,从而有效捕捉复杂的非线性关系,在大规模数据集上表现优异,与传统回归的地震动参数预测模型相比,不需要预设公式并且能捕捉到复杂的震源和场地效应,但是单利用这一网络无法通过计算不同特征权重让模型自动学习判断出哪些特征影响较大,可能导致对关键特征的识别不够精确进而使得预测结果不够准确。因此,本文为了进一步提升模型的预测性能,对DNN神经网络模型进行了改进,建立了Self-DNN神经网络模型,如图2所示。
图2可知,本文模型在多个子网络的输出拼接之后加入了自注意力机制,通过计算不同特征的权重,让模型能够自动学习并判断出哪些特征对最终的输出影响比较大,并能够动态调整对子网络输出的关注度,将更高的权重分配给相对重要的特征,而减少对不重要特征的关注,动态权重的分配可以使得模型对高维复杂的输入进行细致处理,增强模型表达能力,提升模型性能。本文建立的Self-DNN多输入神经网络共有3组输入特征,分别为震源项、路径项和场地项,每组输入特征均有各自的参数,为了保证参数选取的合理性,本文主要参考PEER报告[15]中竖向地震动反应谱传统预测公式SBSA16模型中震源项、路径项和场地项的参数选取方式,同样在震源项中考虑矩震级MW、断层类型mech,路径项中考虑矩震级MW、断层距ln(RJB),场地项中考虑矩震级MW、断层距ln(RJB)、剪切波速ln(VS30)、断层类型mech,将这些参数分别输入到各自的32个神经元中,形成3个子网络,并将3个子网络的输出进行拼接后经由1个自注意力机制层后输入到2个均含32个神经元的隐藏层中,并最终得到输出的参数预测。另外,在建立Self-DNN竖向地震动参数预测模型时,本文采用Python语言和Tensorflow框架[16]对神经网络进行训练,因为神经网络可能会一次学习到同一次地震事件不同的地震动记录,进而影响到对地震动数据特征的准确学习而影响训练结果,为了防止这种情况,因此在划分数据集前先将地震动数据集进行打乱处理,然后按照8∶1∶1的比例将数据集划分成训练集测试集和验证集。
在深度学习模型的构建过程中,损失函数主要是用来衡量预测值与真实值之间差异的函数,不仅是优化算法的核心要素,更是模型性能的关键评估指标。不同类的损失函数,如均方误差MSE、平均绝对误差MAE、均方根误差RMSE,分别代表真实值与预测值差的平方和的平均值,真实值与预测值差的绝对值的平均值以及均方误差MSE的平方根,各自具备特定的数学特性和适用场景,MSE容易受异常值的影响从而产生较大误差,而MAE更新梯度始终相同,对于很小的损失值会有较大的梯度,为了避免这一点,本文综合以上3个指标的结果并结合决定系数R2来共同评价模型性能。上述均方误差MSE、平均绝对误差MAE、均方根误差RMSE以及决定系数R2分别如式(1)~式(4)所示:
式中:n代表地震动的条数;yi代表第i条地震动加速度反应谱的真实值;代表第i条地震动加速度反应谱的预测值;代表所有地震动加速度反应谱真实值的平均值。另外,本文还选用了自适应学习率的Adam梯度下降优化算法[17],从而减小输出误差。
本文主要针对竖向地震动峰值PGA和反应谱Sa这两个参数,采用深度学习算法进行训练,得到了其预测模型。为验证预测结果可靠性和准确性,本文选用PGA、SaT=0.2 s)、SaT=1.0 s)和SaT=3.0 s)这几个指标,把各自预测模型的真实值与预测值进行对比,结果如图3所示。由图3可以发现,测试集中绝大多数数据点在45°基准线区域内且均匀分布在两侧,证明了本文深度学习模型具有良好预测能力。对于PGA和SaT=0.2 s),当真实值位于0.001 g以内时,数据点多位于基准线的上方,说明预测结果偏大;当真实值超过0.1 g时,数据点多位于基准线的下方,说明预测结果偏小。对于SaT=1.0 s),当真实值位于10-4 g以内时,预测结果偏大;而当真实值超过0.10 g时,预测结果偏小。对于SaT=3.0 s),当真实值位于10-5 g以内时,预测结果偏大;当真实值超过0.01 g时,预测结果偏小。随着周期T的不断增大,数据点越接近于基准线,预测更准确。为了对模型的预测效果进行评估,本文选用了MSE、MAE、RMSE、R2这几个指标,将本文模型与DNN模型和SBSA16模型[2]分别进行了对比,如图4所示。通过与其他模型对比分析可以看出,本文模型的MSE、MAE、RMSE这几个指标数值均低于DNN模型和SBSA16模型,在这3个指标上展现出良好性能优势。对于PGA和SaT=0.2 s),通过MSE对比发现,本文模型和DNN模型均显著低于传统SBSA16模型,本文模型MSE约低于DNN模型21%和36%;MAE指标显示,本文模型和DNN模型也都显著低于SBSA16模型,且本文模型更低,约低于DNN模型12%和27%;RMSE的表现与MSE相近。对于SaT=1.0 s)和SaT=3.0 s),本文模型的MSE约低于DNN模型32%和29%,MAE约低于DNN模型31%和26%,RMSE的表现和MSE相似,证明本文模型在预测精度上具有显著优势。在模型的拟合效果R2上,本文模型始终更接近于1;对于PGA和SaT=0.2 s),本文模型的R2约高于DNN模型7%和14%;对于SaT=1.0 s)和SaT=3.0 s),本文模型的R2约高于DNN模型15%和9%,说明本文模型具备良好预测能力。
除了对预测模型的MSE、MAE、RMSE、R2这几个指标进行评估以外,模型的性能还可以通过残差分析来预测评估,残差能有效反映模型的预测误差,一条地震动记录预测值与真实值的差如式(5)所示,并参考文献[18]。残差又可分为事件间残差和事件内残差,事件间残差是一次地震得到的所有地震动记录的残差和再除以地震动记录条数,计算公式如式(6)所示,事件内残差是一次地震记录的误差和这次地震事件间残差的差值,计算公式如式(7)所示:
式中:Rij是一条地震动记录预测值与真实值的差;ln(yij分别代表第i次地震的第j条记录观测得到的真实值和预测模型预测得到的预测值;ηiεij分别代表事件间残差和事件内残差;n是一次地震的地震动个数。事件间残差是各次地震事件的残差,事件内残差是所有地震动记录真实值和预测值二者之差。
为了进一步评估模型预测结果准确性和合理性,本文对PGA和SaT=0.2 s)深度学习模型的预测结果进行了残差分析,残差与MWRJBVS30的分布结果如图5图6所示。从图中可以看出,对于PGA,事件内残差在RJB位于5~10 km时稍偏向小于0的一侧,随着RJB的不断增大无显著变化,而随着VS30以及MW的变化也无显著变化,事件间残差随着MW的不断增大呈现出先稍偏向小于0,然后又稍大于0的趋势,但是整体变化幅度极小。对于SaT=0.2 s),事件内残差在RJB位于5~10 km时稍偏向于大于0的一侧,在RJB大于10 km时变化趋势先略增大后略减小,变化幅度极小;事件内残差随着MW基本没有明显偏移,分布较为均匀;当VS30在900 m/s以内时没有明显偏移,但当VS30超过900 m/s时呈现先变大后稳定的趋势;而事件间残差随MW分布整体略低于0基准线但并无明显偏移。总体来说,事件内残差主要集中分布在[-2,2]范围内,事件间残差主要集中分布在[-1,1]内,且在0基准线两边分布较为均匀,预测结果具有一定可靠性。
为了进一步验证所提Self-DNN深度学习模型预测结果合理性,对矩震级MW=5的走滑地震在VS30=750 m/s进行断层距RJB在300 km以内的PGA和不同周期Sa进行预测,并和传统方法预测模型SBSA16以及DNN神经网络预测模型对比,结果如图7所示,由图可以看出,PGA和不同周期Sa的值均随断层距RJB的增大而不断减小,说明近场区域对竖向地震动的峰值影响很大,在近场区域容易产生峰值较大的竖向地震动,而在中远场区域影响则逐渐减小。对于PGA,当RJB在30 km以内时,SBSA16模型的预测值大于DNN模型和本文模型,且DNN模型的预测值要低于本文模型;当RJB大于30 km时,随着RJB的不断增大,尤其是在中远场时,SBSA16和DNN模型的预测值略低于本文模型,但二者相差不大。对于Sa,当T=0.2 s时,SBSA16模型的预测值整体大于本文模型和DNN模型,且DNN模型的预测值整体要低于本文模型;T=1.0 s、RJB在10 km以内时,SBSA16模型预测值偏大,本文模型和DNN模型相差不大,当RJB大于10 km时,DNN模型和SBSA16模型预测值要高于本文模型,但3个模型相差不大;而当T=3.0 s时,DNN模型的预测值要高于本文模型和SBSA16模型,当RJB在70 km以内时,SBSA16模型的预测值大于本文Self-DNN模型,而当RJB位于70~300 km时,SBSA16模型的预测值要低于本文模型。本文模型的适用范围为MW=4~8,但当MW超过7时,预测结果受数据分布不均匀的影响较大,预测的不确定性增大。
图8RJB=50 km,VS30=750 m/s,走滑地震在MW=4、5、6、7、8时进行PGA和不同周期的Sa预测,并和传统方法预测模型SBSA16以及DNN神经网络预测模型对比。由图可以看出,峰值均随矩震级MW的不断增大而增大,并且在中大震时增大幅度变缓,震级对峰值的影响同样不可忽略,尤其是当震级很大时,竖向地震动峰值也较大。对于PGA,当矩震级MW在4.0~4.5时,SBSA16模型预测值略大,本文Self-DNN模型和DNN模型预测结果相近;当矩震级MW在4.5~6.0时,DNN模型预测值偏低,本文模型和SBSA16模型预测效果接近;当矩震级MW大于6.0时,其余两个模型预测值相差不大且均低于本文Self-DNN模型。对于Sa,在T=0.2 s、矩震级MW在4~5时,DNN模型的预测值略小于本文模型和SBSA16模型,本文模型预测值和SBSA16模型预测值较为接近;当矩震级MW介于5~7时,SBSA16模型的预测值偏大,DNN模型预测值略低于本文模型;而当矩震级MW大于6.8时,DNN模型的预测值更大。在T=1.0 s时,当矩震级MW小于5时,DNN模型的预测值略大于其余两个模型,SBSA16模型预测值略低于本文模型;当MW介于5~7时,3个模型预测效果较为接近;而当MW大于7时,其余两个模型预测值稍低于本文模型;在T=3.0 s时,3个模型预测值整体差别不大,在震级较大时DNN模型的预测值略大。
图9表示的是MW=5、RJB=30 km时,走滑地震进行场地VS30在100~1 000 m/s以内的PGA和不同周期的Sa预测,并和传统方法预测模型以及DNN神经网络预测模型对比。由图可以看出,峰值均随VS30的不断增大而减小,并且随着VS30的不断增大减小幅度逐渐变缓,场地VS30对竖向地震动的影响不可忽略,场地越软,竖向地震动的峰值越大。对于PGA,DNN模型和SBSA16模型的预测值整体低于本文Self-DNN模型。而对于Sa,在T=0.2 s时,SBSA16模型整体预测值高于本文模型和DNN模型,而VS30介于500~700 m/s时,本文模型预测值和DNN模型预测值相差不大;当VS30小于500 m/s时,DNN模型预测值低于本文模型。当T=1.0 s时,SBSA16模型的预测值整体高于其他两个模型;当VS30介于500~700 m/s时,本文Self-DNN模型预测值和DNN模型预测值接近;当VS30介于700~1 000 m/s时,DNN模型预测值要高于本文模型;而当VS30=100~500 m/s时,DNN模型预测值略小于本文模型。在T=3.0 s时,DNN模型的预测值整体大于其余两个模型,且SBSA16模型的预测值整体低于本文模型。
本文进一步对竖向地震动的反应谱进行预测分析。图10表示的是MW=5、6、7,RJB=70 km,走滑地震在场地VS30为750 m/s时的不同周期的Sa预测值。由图可知,当周期T=0~0.2 s时,反应谱谱值随着周期T的不断增大而不断增大,在T=0.2 s时达到顶峰。这是因为在短周期时地震动的高频能量较丰富,短周期结构具有较高自振频率,能够与地震动中的高频成分形成共振,从而放大加速度响应;在T=0.2~6.0 s,反应谱的谱值随着周期T的不断增大呈现递减的趋势,这是因为单自由度体系结构自振周期长,地震动主要成分集中在较短周期内,二者间频率不匹配,导致反应谱谱值低。当MW=5时,SBSA16模型的预测值高于本文模型和DNN模型;在T=0~0.025 s时,DNN模型的预测值要高于本文模型;在T>0.025 s时,DNN模型的预测值低于本文模型。在MW=6、T=0~0.35 s时,SBSA16模型的预测值要高于其余两个模型,其余两个模型预测值相差并不是很大;在T=0.35~6.0 s时,DNN模型和SBSA16模型预测值要高于本文模型。当MW=7时,DNN模型预测值整体偏高,SBSA16模型预测值要高于本文模型。
更进一步,为了说明不同断层类型对竖向地震动反应谱的影响,本文分别对不同断层类型下的竖向地震动反应谱进行了预测对比分析,图11表示的是MW=6,RJB=50、100、150 km,不同断层类型地震在场地VS30为750 m/s时的不同周期的Sa预测值,由图可知,当RJB=50 km、T=0~0.2 s时逆断层下的竖向地震动预测值略高于其余两个断层,其余两个断层类型下的预测值相差不大,在T=1~6 s时,正断层下的竖向地震动预测值高于其余两个模型,当RJB=100、150 km,在T=0~0.2 s时逆断层下的竖向地震动预测值同样高于其余两个断层,并且随着断层距的不断减小,逆断层下的竖向地震动在短周期时的预测值要更高于其余两个断层。由此可知,在短周期时逆断层的地面振动较为剧烈,这是因为在短周期时逆断层的运动与高频地震波的传播相匹配,使得逆断层在短周期反应谱上表现得较显著,而在长周期时低频地震波与正断层的运动方式较契合,使得正断层在长周期反应谱上贡献更大。
本文选取NGA-West2数据库中9 953条竖向地震动记录,以矩震级MW、断层距RJB、不同断层类型、场地VS30作为输入参数,按照震源项、路径项和场地项3组进行输入;采用深度学习算法进行网络训练,建立了竖向地震动PGA和不同周期Sa的预测模型;选用了MSE、MAE、RMSE和R2这4个指标进行本文模型与传统预测公式模型及DNN神经网络预测模型的对比,并通过预测值与真实值对比和残差分析证明了预测结果的合理性。最后,将本文模型与用传统回归方法建立的预测公式以及DNN模型在一定条件下的预测结果进行了对比,进一步验证本文深度学习模型的合理性。主要得到以下结论:
1)对本文预测模型进行事件内和事件间残差分析表明,事件内残差主要集中分布在[-2,2]内,事件间残差主要集中分布在[-1,1]内并在残差为0的基准线两侧呈现均匀分布,而且随着矩震级MW、断层距RJB、场地VS30等参数均无明显变化趋势,证明本文深度学习模型预测结果具有合理性和可靠性。
2)对本文深度学习预测模型与传统预测公式和DNN神经网络模型的4个性能指标对比表明,本文深度学习模型的MSE、MAE、RMSE均低于传统预测公式和DNN模型,R2高于传统预测公式和DNN模型,证明本文深度学习模型预测结果更准确。
3)竖向地震动反应谱预测结果分析表明,反应谱的谱值随着断层距的不断增大而逐渐减小,并且随着断层距的增加衰减加快;随着矩震级的不断增大而增大,并且增长速度逐渐变缓;随着场地VS30的不断增大而减小并且衰减速度逐渐变慢。
4)在MW=5、6、7这3个不同震级,在短周期时反应谱谱值随着周期T的不断增大而增大,在T=0.2 s时达到顶峰;而在长周期时反应谱谱值随着周期T的不断增大而减小。不同断层类型预测结果对比分析表明,逆断层在短周期反应谱上表现得较显著,而在长周期部分正断层对反应谱的贡献较大。
  • 黑龙江省自然科学基金资助项目(LH2022E122)
  • 国家自然科学基金项目(52178514)
  • 中国地震局工程力学研究所基本科研业务费专项资助项目(2024C17)
  • 国家科技重点研发计划课题省级资助项目(GX18C005)
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2025年第41卷第4期
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doi: 10.19994/j.cnki.WEE.2025.0064
  • 接收时间:2025-01-15
  • 首发时间:2026-03-27
  • 出版时间:2025-10-01
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  • 收稿日期:2025-01-15
  • 修回日期:2025-04-09
基金
黑龙江省自然科学基金资助项目(LH2022E122)
国家自然科学基金项目(52178514)
中国地震局工程力学研究所基本科研业务费专项资助项目(2024C17)
国家科技重点研发计划课题省级资助项目(GX18C005)
作者信息
    1.中国地震局工程力学研究所 地震工程与工程振动重点实验室,黑龙江 哈尔滨 150080
    2.地震灾害防治应急管理部重点实验室,黑龙江 哈尔滨 150080

通讯作者:

公茂盛(1976—),男,研究员,博士,主要从事地震工程研究。E-mail:
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
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红菇属 Russula 17 8.13
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