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http://dx.doi.org/10.15683/kosdi.2021.12.31.747

Seismic Fragility Analysis based on Material Uncertainties of I-Shape Curved Steel Girder Bridge under Gyeongju Earthquake  

Jeon, Juntai (Department of Civil & Environmental Engineering, Inha Technical College)
Ju, Bu-Seog (Department of Civil Engineering, Kyunghee University)
Son, Ho-Young (Department of Civil Engineering, Kyunghee University)
Publication Information
Journal of the Society of Disaster Information / v.17, no.4, 2021 , pp. 747-754 More about this Journal
Abstract
Purpose: Seismic safety evaluation of a curved bridge must be performed since the curved bridges exhibit the complex behavior rather than the straight bridges, due to geometrical characteristics. In order to conduct the probabilistic seismic assessment of the curved bridge, Seismic fragility evaluation was performed using the uncertainty of the steel material properties of a curved bridge girde, in this study. Method: The finite element (FE) model using ABAQUS platform of the curved bridge girder was constructed, and the statistical parameters of steel materials presented in previous studies were used. 100 steel material models were sampled using the Latin Hypercube Sampling method. As an input ground motion in this study, seismic fragility evaluation was performed by the normalized scale of the Gyeongju earthquake to 0.2g, 0.5g, 0.8g, 1.2g, and 1.5g. Result: As a result of the seismic fragility evaluation of the curved girder, it was found that there was no failure up to 0.03g corresponding to the limit state of allowable stress design, but the failure was started from 0.11g associated with using limit state design. Conclusion: In this study, seismic fragility evaluation was performed considering steel materials uncertainties. Further it must be considered the seismic fragility of the curved bridge using both the uncertainties of input motions and material properties.
Keywords
Curved Bridge; Seismic Fragility; FE Model; Material Uncertainties; Latin Hypercube;
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