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Earthquakes and Structures Volume 23, Number 5, November 2022 , pages 463-472 DOI: https://doi.org/10.12989/eas.2022.23.5.463 |
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Seismic retrofitting and fragility for damaged RC beam-column joints using UHP-HFRC |
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Trishna Choudhury and Prem P. Bansal
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| Abstract | ||
| Reinforced concrete (RC) beam column joints (BCJ) have mostly exhibited poor seismic performance during several past earthquakes, typically due to the poor-quality concrete or lack of reinforcement detailing typical of pre-code design practice. The present study is motivated towards numerical simulation and seismic fragility assessment of one such RC-BCJ. The BCJ is loaded to failure and strengthened using Ultra High Performance-Hybrid Fiber Reinforced Concrete (UHP-HFRC) jacketing. The strengthening is performed for four different BCJ specimens, each representing an intermediate damage state before collapse. viz., slight, moderate, severe, and collapse. From the numerical simulation of all the BCJ specimens, an attempt is made to correlate different modelling and design parameters of the BC joint with respect to the damage states. In addition, seismic fragility analysis of the original as well as the retrofitted damaged BCJ specimens show the relative enhancement achieved in each case. | ||
| Key Words | ||
| Beam Column Joint (BCJ); Hybrid Fiber Reinforced Concrete (HFRC); nonlinear analysis; performance; retrofitting; seismic fragility | ||
| Address | ||
| Civil Engineering Department, Thapar Institute of Engineering and Technology, Patiala, Punjab - 147004, India | ||