Abstract
This paper presents an experimental investigation on the flexural behavior of ultra-high-performance concrete (UHPC) beams prestressed with external carbon fiber-reinforced polymer (CFRP) tendons. A total of eight T-shaped beam specimens were fabricated and tested, and the effects of the effective prestressing stress, partial prestressing ratio, deviated angle, and loading condition on the flexural behavior were analyzed. The experimental results indicate that the fully prestressed beams experienced a brittle failure, and the shear capacity of these beams was mainly controlled by the effective prestressing stress in CFRP tendons and the ultimate tensile strength of UHPC, whereas the partially prestressed beams failed in a ductile manner. The presence of internal steel reinforcement could significantly improve the flexural capacity and deformation ability. Thus, internal reinforcements should not be omitted from UHPC beams with CFRP tendons. A higher effective prestressing stress resulted in enhanced cracking load and flexural capacity. The deviated angle enhanced the utilization efficiency of high strength CFRP tendons. The loading condition exerted a slight influence on the flexural behavior of the specimens. Moreover, a method considering the effect of steel fibers was proposed and verified to predict the flexural capacity of UHPC beams prestressed with external CFRP tendons.
Highlights
Research and development on the application of ultra-high-performance concrete (UHPC) has progressed significantly throughout the world in recent years
This paper presented an experimental research on the flexural behavior of UHPC beams prestressed with external carbon fiber-reinforced polymer (CFRP) tendons
The average value of Pu/Pcr of four partially prestressed beams were around 2.21. These results indicated that the addition of internal tensile bars significantly enhanced the flexural behavior of UHPC beams prestressed with external CFRP tendons
Summary
Research and development on the application of ultra-high-performance concrete (UHPC) has progressed significantly throughout the world in recent years. Wang et al [26] reported an experimental program consisted of three reinforced concrete beams prestressed with external basalt FRP (BFRP) tendons, and the influence of the effective prestressing stress and tendon profile on flexural behavior were discussed. It indicated that the presence of deviators enhanced the ultimate capacity as well as ductility, and a higher effective prestressing stress led to a higher ultimate stress in external BFRP tendons. A prediction method for estimating the flexural capacity of the beams was introduced in detail
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