Xu, Qizhi; Tan, Yuqing; Lu, Kaiwei; Wendel, Sebastian; Wang, Jingquan; (2025) Flexural Performance of UHPC Beams with Externally Prestressed Plain CFRP Tendons. Journal of Composites for Construction , 29 (6) 04025043-1-04025043-15. 10.1061/JCCOF2.CCENG-5153.

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Abstract

This paper reports the flexural performance of ultrahigh-performance concrete (UHPC) beams externally prestressed with carbon fiber–reinforced polymer (CFRP) tendons. To consider the influence of concrete strengths, prestressing levels, and external CFRP tendon diameters on their failure modes, crack distribution, load–midspan deflection, stress increment–midspan deflection relationship, and ductility, this study entailed six simply supported beams. The test results show that, as the initial prestressing force increased, the failure modes changed from the peeling off of UHPC to the crushing of UHPC and fracture of the CFRP tendon. Replacing the normal concrete with UHPC improved the ultimate strength by 50% and reduced the maximum crack width from 0.3 to 0.2 mm. Increasing the initial prestress by 21% and 44% in the 8- and 11-mm-diameter CFRP tendons resulted in 14% and 38% higher cracking loads, respectively, with a wider domain of UHPC sharing the loads, which became more pronounced as the diameter of the CFRP tendon increased. The denser and shorter crack distributions were compatible with the structural whole-dependent deformation, resulting in higher structural ductility. The stress increment in the external CFRP tendon increased linearly with the midspan deflection, mainly during the postyielding stage. Finally, the ultimate flexural strength was evaluated and compared with those obtained using current calculation methods.

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