Seismic fragilities of single‐column highway bridges with rocking column‐footing

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dc.citation.firstpage843en_US
dc.citation.issueNumber7en_US
dc.citation.journalTitleEarthquake Engineering & Structural Dynamicsen_US
dc.citation.lastpage864en_US
dc.citation.volumeNumber48en_US
dc.contributor.authorXie, Yazhouen_US
dc.contributor.authorZhang, Jianen_US
dc.contributor.authorDesRoches, Reginalden_US
dc.contributor.authorPadgett, Jamie E.en_US
dc.date.accessioned2019-08-16T17:27:29Zen_US
dc.date.available2019-08-16T17:27:29Zen_US
dc.date.issued2019en_US
dc.description.abstractRocking isolation has been increasingly studied as a promising design concept to limit the earthquake damage of civil structures. Despite the difficulties and uncertainties of predicting the rocking response under individual earthquake excitations (due to negative rotational stiffness and complex impact energy loss), in a statistical sense, the seismic performance of rocking structures has been shown to be generally consistent with the experimental outcomes. To this end, this study assesses, in a probabilistic manner, the effectiveness of using rocking isolation as a retrofit strategy for single‐column concrete box‐girder highway bridges in California. Under earthquake excitation, the rocking bridge could experience multi‐class responses (eg, full contacted or uplifting foundation) and multi‐mode damage (eg, overturning, uplift impact, and column nonlinearity). A multi‐step machine learning framework is developed to estimate the damage probability associated with each damage scenario. The framework consists of the dimensionally consistent generalized linear model for regression of seismic demand, the logistic regression for classification of distinct response classes, and the stepwise regression for feature selection of significant ground motion and structural parameters. Fragility curves are derived to predict the response class probabilities of rocking uplift and overturning, and the conditional damage probabilities such as column vibrational damage and rocking uplift impact damage. The fragility estimates of rocking bridges are compared with those for as‐built bridges, indicating that rocking isolation is capable of reducing column damage potential. Additionally, there exists an optimal slenderness angle range that enables the studied bridges to experience much lower overturning tendencies and significantly reduced column damage probabilities at the same time.en_US
dc.identifier.citationXie, Yazhou, Zhang, Jian, DesRoches, Reginald, et al.. "Seismic fragilities of single‐column highway bridges with rocking column‐footing." <i>Earthquake Engineering & Structural Dynamics,</i> 48, no. 7 (2019) Wiley: 843-864. https://doi.org/10.1002/eqe.3164.en_US
dc.identifier.doihttps://doi.org/10.1002/eqe.3164en_US
dc.identifier.urihttps://hdl.handle.net/1911/106265en_US
dc.language.isoengen_US
dc.publisherWileyen_US
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by Wiley.en_US
dc.titleSeismic fragilities of single‐column highway bridges with rocking column‐footingen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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