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原文传递 Machine Learning for Enhanced Regional Seismic Risk Assessments

题名：	Machine Learning for Enhanced Regional Seismic Risk Assessments
正文语种：	eng
作者：	Pouria Kourehpaz;Carlos Molina Hutt
作者单位：	Univ. of British Columbia;Univ. of British Columbia
关键词：	Seismic risk assessments;Seismic damage;Collapse assessment;Machine learning methods;Synthetic data
摘要：	Abstract The ability to conduct accurate regional seismic risk assessments is key to informing a risk-reduction policy and fostering community resilience. This paper presents a machine learning-based framework to predict a building’s postearthquake damage state using structural properties and ground motion intensity measures as model inputs. The machine learning techniques assessed, namely, logistic regression, k-nearest neighbors, decision tree, random forest, AdaBoost, and gradient boosting, are trained using a dataset of nonlinear response history analysis results from 36 detailed structural models of modern reinforced concrete shear wall buildings ranging from four to 24 stories and subjected to approximately 500 ground motion records with a range of shaking intensities. The results indicate that the gradient boosting classifier is the most efficient algorithm by achieving a prediction success (F1-score) of 87%. The proposed framework also leverages synthetic data samples to support the prediction of severe damage state instances, that is, collapse. The percentage of observed collapse cases correctly classified by the gradient boosting algorithm is increased from 76% to 93% when synthetic data are also used for training. The framework is implemented in a portfolio of reinforced concrete shear wall buildings across the Metro Seattle region to quantify earthquake-induced damage and collapse risk. The framework shows great potential for enhancing regional seismic risk assessments by leveraging datasets of detailed nonlinear response history analysis results.
出版年：	2022
期刊名称：	Journal of structural engineering
卷：	148
期：	9
页码：	1-16