International Journal of Concrete Structures and Materials

Korea Concrete Institute (한국콘크리트학회)
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Collapse Vulnerability and Fragility Analysis of Substandard RC Bridges Rehabilitated with Different Repair Jackets Under Post-mainshock Cascading Events

  • Fakharifar, Mostafa (Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology) ;
  • Chen, Genda (Missouri University of Science and Technology) ;
  • Dalvand, Ahmad (Department of Engineering, Lorestan University) ;
  • Shamsabadi, Anoosh (Office of Earthquake Engineering, California Department of Transportation)
  • Received : 2014.10.18
  • Accepted : 2015.07.30
  • Published : 2015.09.30
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Abstract

Past earthquakes have signaled the increased collapse vulnerability of mainshock-damaged bridge piers and urgent need of repair interventions prior to subsequent cascading hazard events, such as aftershocks, triggered by the mainshock (MS). The overarching goal of this study is to quantify the collapse vulnerability of mainshock-damaged substandard RC bridge piers rehabilitated with different repair jackets (FRP, conventional thick steel and hybrid jacket) under aftershock (AS) attacks of various intensities. The efficacy of repair jackets on post-MS resilience of repaired bridges is quantified for a prototype two-span single-column bridge bent with lap-splice deficiency at column-footing interface. Extensive number of incremental dynamic time history analyses on numerical finite element bridge models with deteriorating properties under back-to-back MS-AS sequences were utilized to evaluate the efficacy of different repair jackets on the post-repair behavior of RC bridges subjected to AS attacks. Results indicate the dramatic impact of repair jacket application on post-MS resilience of damaged bridge piers-up to 45.5 % increase of structural collapse capacity-subjected to aftershocks of multiple intensities. Besides, the efficacy of repair jackets is found to be proportionate to the intensity of AS attacks. Moreover, the steel jacket exhibited to be the most vulnerable repair intervention compared to CFRP, irrespective of the seismic sequence (severe MS-severe or moderate AS) or earthquake type (near-fault or far-fault).

Keywords

Acknowledgement

Supported by : U.S. National Science Foundation

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