Seismic Performance of Post-Mainshock FRP/Steel Repaired RC Bridge Columns Subjected to Aftershocks

Abstract

This study compares the performances of three types of repair jackets on mainshock (MS) earthquake-damaged RC bridge columns subjected to aftershock (AS) attacks. These repair jackets include fiber reinforced polymers (FRP), thick steel, and thin steel wrapped with prestressing strands. Results obtained from incremental dynamic time history analyses on refined numerical finite element bridge models were utilized to evaluate the efficacy of different repair jackets application on the post-MS collapse safety of RC bridges subjected to AS attacks of various intensities. Numerical results indicated that the three repair jackets can effectively improve the bridge collapse capacity by approximately 20% under severe MS-severe AS even though they cannot restore the initial stiffness of damaged columns. Repair jackets for the severe MS-damaged columns were ineffective under moderate AS events and thus not required. Steel repair jackets exhibited higher energy dissipation under MS–AS sequences than FRP jackets. In the case of FRP jackets, bidirectional fiber wraps are recommended for plastic hinge confinement of MS-damaged bridge columns subjected to aftershocks.

Department(s)

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Carbon-Carbon Composites (CCCs); Hybrid; Finite Element Analysis (FEA); Numerical Analysis; Repair and Retrofit

International Standard Serial Number (ISSN)

1359-8368

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2014 Elsevier Science, All rights reserved.

Publication Date

01 Apr 2015

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