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Keywords: carbon fibre reinforced plastic tendon, T-shaped beam, reinforced concrete, externally prestressing, flexural behaviour, ductility, flexural capacity.

Summary

With the rapid development of heavy-loaded railway system, it has become a key facility in freight transportation. The structural elements in this system, in particular for bridge beams, experience vibration and damage when subjected to long-term moving loads during service. The external prestressing technique is widely used in railway systems due to its significant improvement in the bearing capacity of damaged bridge beams. This paper adopted an innovative external prestressing method to study the flexural behaviour of externally prestressed carbon fibre reinforced plastic (CFRP) tendons strengthened T-shaped section reinforced concrete (RC) beams subjected to static loads. The influences of concrete strength, reinforcement ratio of the non-prestressed tensile steel bars and the tension control stress of the CFRP tendons on the flexural behaviour in terms of bearing capacity and ductility were examined. The test results revealed that, compared with un-strengthened RC beams, the specimens externally strengthened with prestressed CFRP tendons showed a better performance in the flexural capacity, as well as overall stiffness and ductility. For the above mentioned factors, the flexural bearing capacity appears to be further improved as the reinforcement ratio of non-prestressed tensile bars and the tension control stress of CFRP tendons increase. However, a worse ductility effect on the strengthened RC beams was observed with the increase in the concrete strength, the reinforcement ratio of non-prestressed tensile bars and the tension control stress of CFRP tendons. Finally, the calculation formula for flexural capacity of externally prestressed CFRP tendons strengthened T-beams was established, which can provide a reference for practical engineering design.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 110 PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 135 An Experimental Study on the Flexural Behaviour of Reinforced Concrete T-Beams Externally Strengthened with CFRP Tendons F.Q. Deng¹, L.H. Xu¹, F. Xu² and Y. Chi¹ ¹School of Civil Engineering, Wuhan University, China ²Infrastructure Division, China State Construction Engineering Corporation Limited, Beijing, China doi:10.4203/ccp.110.135 purchase the full-text of this paper Full Bibliographic Reference for this paper F.Q. Deng, L.H. Xu, F. Xu, Y. Chi, "An Experimental Study on the Flexural Behaviour of Reinforced Concrete T-Beams Externally Strengthened with CFRP Tendons", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 135, 2016. doi:10.4203/ccp.110.135 Keywords: carbon fibre reinforced plastic tendon, T-shaped beam, reinforced concrete, externally prestressing, flexural behaviour, ductility, flexural capacity. Summary With the rapid development of heavy-loaded railway system, it has become a key facility in freight transportation. The structural elements in this system, in particular for bridge beams, experience vibration and damage when subjected to long-term moving loads during service. The external prestressing technique is widely used in railway systems due to its significant improvement in the bearing capacity of damaged bridge beams. This paper adopted an innovative external prestressing method to study the flexural behaviour of externally prestressed carbon fibre reinforced plastic (CFRP) tendons strengthened T-shaped section reinforced concrete (RC) beams subjected to static loads. The influences of concrete strength, reinforcement ratio of the non-prestressed tensile steel bars and the tension control stress of the CFRP tendons on the flexural behaviour in terms of bearing capacity and ductility were examined. The test results revealed that, compared with un-strengthened RC beams, the specimens externally strengthened with prestressed CFRP tendons showed a better performance in the flexural capacity, as well as overall stiffness and ductility. For the above mentioned factors, the flexural bearing capacity appears to be further improved as the reinforcement ratio of non-prestressed tensile bars and the tension control stress of CFRP tendons increase. However, a worse ductility effect on the strengthened RC beams was observed with the increase in the concrete strength, the reinforcement ratio of non-prestressed tensile bars and the tension control stress of CFRP tendons. Finally, the calculation formula for flexural capacity of externally prestressed CFRP tendons strengthened T-beams was established, which can provide a reference for practical engineering design. purchase the full-text of this paper (price £22) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £85 +P&P)
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