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Comparative Analysis of Existing RC Columns Jacketed with CFRP or FRCC
Marta Del Zoppo1, Marco Di Ludovico2, Alberto Balsamo3
1Department of Engineering, University of Naples Parthenope, 80143 Naples, Italy. marta.delzoppo@uniparthenope.it.
Polymers
|April 11, 2019
Summary
Fiber Reinforced Polymers (FRP) and Fiber Reinforced Cementitious Composite (FRCC) jacketing enhance seismic performance of reinforced concrete columns. CFRP jacketing is more effective for poor quality concrete, while FRCC offers a viable alternative for deteriorated columns.
Area of Science:
- Civil Engineering
- Structural Engineering
- Materials Science
Background:
- Existing reinforced concrete (RC) columns often fail during seismic events due to poor concrete quality and inadequate seismic detailing.
- Externally bonded Fiber Reinforced Polymers (FRP) can improve shear capacity and ductility, but their effectiveness against shear-interaction mechanisms needs further study.
- This research investigates seismic strengthening of RC columns with varying concrete quality and retrofit techniques.
Purpose of the Study:
- To evaluate the effectiveness of Fiber Reinforced Polymer (FRP) and Fiber Reinforced Cementitious Composite (FRCC) jacketing for seismic strengthening of reinforced concrete (RC) columns.
- To compare the performance of Carbon Fiber Reinforced Polymer (CFRP) local jacketing on columns with poor versus medium quality concrete.
- To assess FRCC jacketing as an alternative retrofit strategy for deteriorated or damaged RC columns.
Main Methods:
- Six full-scale reinforced concrete columns were subjected to cyclic loading tests.
- One column served as a control, four were strengthened with local CFRP jacketing in the plastic hinge region.
- One column was fully jacketed with FRCC.
Main Results:
- CFRP local jacketing demonstrated greater effectiveness in enhancing the seismic performance of columns with poor quality concrete compared to medium quality concrete.
- FRCC jacketing proved to be a sound repair strategy and a viable alternative to FRP for strengthening columns with poor quality concrete.
- The study highlighted the significant impact of concrete strength on the efficacy of FRP strengthening interventions.
Conclusions:
- Local CFRP jacketing is a more effective seismic retrofit for RC columns with poor quality concrete.
- FRCC jacketing presents a promising alternative for repairing and strengthening deteriorated or seismically damaged RC columns.
- Further experimental research is recommended to optimize FRCC jacketing techniques for seismic retrofitting.
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