Experimental study on flexural behavior of concrete T-beams strengthened with externally prestressed tendons

Jinhua Zou; Yonghui Huang; Wenxian Feng; Yanhua Chen; Yue Huang; Jinhua Zou; Yonghui Huang; Wenxian Feng; Yanhua Chen; Yue Huang

doi:10.3934/mbe.2019349

Mathematical Biosciences and Engineering

2019, Volume 16, Issue 6: 6962-6974. doi: 10.3934/mbe.2019349

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Experimental study on flexural behavior of concrete T-beams strengthened with externally prestressed tendons

1.
School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China
2.
Guangzhou University-Tamkang University Joint Research Center for Engineering Structure Disaster Prevention and Control, Guangzhou University, Guangzhou, 510006, China

Received: 15 May 2019 Accepted: 25 July 2019 Published: 30 July 2019

To investigate effect of the number of deviators, the tension method, and the tendon profile on the flexural behaviour of reinforcement concrete (RC) T-beams strengthened with externally prestressed tendons, seven identical RC T-beams strengthened with external prestressing tendons were tested under four-point loading. Of these, one beam was ordinary RC beam without strengthening, another six beams were classified into three groups termed G1, G2 and G3. Two beams in G1 had identical straight external tendons with a different number of deviators, two beams in G2 had identical V shape external tendons with different tension method, and two beams in G3 had identical U shape external tendons with different tension method. The failure mode, deflection, strain, load carrying capacity and ductility of the specimens under loading were recorded and analyzed. Test results indicated that strengthening with external prestressing tendons is a very effective method to improve the load carrying capacity and stiffness of the RC beam. Provision of two deviators at the loading points led to satisfactory service load behavior (deflection, cracking, and concrete strain) and a higher load carrying capacity compared to the case where one deviator or no deviators were provided. In addition, tension method of the external tendon nearly had no effect on the load carrying capacity and mechanical behaviour of the RC beams.
- concrete beam,
- external tendon,
- four-point bending test,
- load carrying capacity,
- deviator,
- tendon profile
Citation: Jinhua Zou, Yonghui Huang, Wenxian Feng, Yanhua Chen, Yue Huang. Experimental study on flexural behavior of concrete T-beams strengthened with externally prestressed tendons[J]. Mathematical Biosciences and Engineering, 2019, 16(6): 6962-6974. doi: 10.3934/mbe.2019349

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Abstract

To investigate effect of the number of deviators, the tension method, and the tendon profile on the flexural behaviour of reinforcement concrete (RC) T-beams strengthened with externally prestressed tendons, seven identical RC T-beams strengthened with external prestressing tendons were tested under four-point loading. Of these, one beam was ordinary RC beam without strengthening, another six beams were classified into three groups termed G1, G2 and G3. Two beams in G1 had identical straight external tendons with a different number of deviators, two beams in G2 had identical V shape external tendons with different tension method, and two beams in G3 had identical U shape external tendons with different tension method. The failure mode, deflection, strain, load carrying capacity and ductility of the specimens under loading were recorded and analyzed. Test results indicated that strengthening with external prestressing tendons is a very effective method to improve the load carrying capacity and stiffness of the RC beam. Provision of two deviators at the loading points led to satisfactory service load behavior (deflection, cracking, and concrete strain) and a higher load carrying capacity compared to the case where one deviator or no deviators were provided. In addition, tension method of the external tendon nearly had no effect on the load carrying capacity and mechanical behaviour of the RC beams.

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