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| An experimental study on bending behavior of damaged beams reinforced with high ductile concrete |
| KOU Jialiang1,2，CAI Pengyang1，WANG Dong1，ZHOU Heng3 |
1.School of Construction Engineering, Xi’an University of Technology, Xi’an 710048, China;
2.State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, China;
3.Northwest Engineering Corporation Limited, Xi’an 710065, China |
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Abstract Using high ductile concrete (HDC) good adhesion properties and crack control ability, 19 reinforced concrete beams with ultimate bearing capacity are strengthened.The four-point bending performance test was carried out to study the effects of HDC-reinforced broken concrete beams on the development of cracks, failure modes, bearing capacity, deflection changes and stress changes.The effects of different HDC thickness and reinforcement ratio on the reinforcement performance of HDC reinforced concrete beams were analyzed. The results showed that: The load-carrying capacity of the damaged concrete beam strengthened by HDC has been significantly improved, and the peak load is increased by up to 89%; The fracture after the failure is more than the original beam and the development is complete; the reinforcement effect of increasing the thickness of the reinforcement layer is obviously better than the improvement of the hoop ratio; The ultimate deflection at cracking load and failure was increased by 250% and 189%, respectively, and the ductility was significantly improved. The largest crack did not occur at the interface, the bonding between the old and new concrete was very good, and the cooperative work performance was good. According to the test results, the simplified calculation formula of the flexural capacity of the damaged concrete beams with high ductility is obtained. The calculated values agree well with the experimental results.
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Received: 11 November 2020
Published: 28 April 2022
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