A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Development length and bond behavior of lap-spliced reinforcement in Ultra-high performance concrete beams
https://orcid.org/0000-0002-7490-9335
https://orcid.org/0000-0002-1592-7218
Highlights Seventeen UHPC lap-spliced beams are tested to simulate the flexural member bond conditions. Significant influence of UHPC compressive strength, fiber content, cover depth, splice length and transverse confinement are comprehensively analyzed. A simplified equation is developed to determine the UHPC bond splitting strength under realistic stress states. The maximum limit of bond strength contributed by the stirrup is obtained. The calculation model for the development length applicable to UHPC is established by modifying the NC theory method.
Abstract Ultra-high performance concrete (UHPC) is a new composite material that can significantly improve bond performance with steel bars. There is insufficient research on UHPC bond behavior under actual stress within structural members, which is critical for structure safety and economy. In this paper, 17 lap-spliced beams were tested to simulate flexural member bond conditions. The test parameters included UHPC compressive strength, cover depth, fiber content, splice length and stirrups in the spliced region. All specimens failed by the UHPC cover splitting crack. The beam without fiber experienced brittle splitting failure, while the beams with fibers experienced ductile splitting failure. The test results showed that increasing UHPC strength and cover depth could increase bond strength. The bond strength increased linearly with fiber content from 0% to 3% but decreased with 4% fiber content. Bond strength decreased linearly with splice length. Transverse reinforcement in the lap splice effectively improved bond strength; however, when the additional confinement reaches a limit, the increase in stirrups no longer improves UHPC bond stress. The experimental study established a formula for predicting UHPC bond splitting strength, considering the influence of the above parameters. The maximum limit of bond strength contributed by the stirrup was obtained. Finally, the development length calculation model applicable to UHPC was established by modifying the NC theory method. The proposed model was compared with current design methods, and the predicted values of the proposed model were closest to the experimental values.
Development length and bond behavior of lap-spliced reinforcement in Ultra-high performance concrete beams
https://orcid.org/0000-0002-7490-9335
https://orcid.org/0000-0002-1592-7218
Highlights Seventeen UHPC lap-spliced beams are tested to simulate the flexural member bond conditions. Significant influence of UHPC compressive strength, fiber content, cover depth, splice length and transverse confinement are comprehensively analyzed. A simplified equation is developed to determine the UHPC bond splitting strength under realistic stress states. The maximum limit of bond strength contributed by the stirrup is obtained. The calculation model for the development length applicable to UHPC is established by modifying the NC theory method.
Abstract Ultra-high performance concrete (UHPC) is a new composite material that can significantly improve bond performance with steel bars. There is insufficient research on UHPC bond behavior under actual stress within structural members, which is critical for structure safety and economy. In this paper, 17 lap-spliced beams were tested to simulate flexural member bond conditions. The test parameters included UHPC compressive strength, cover depth, fiber content, splice length and stirrups in the spliced region. All specimens failed by the UHPC cover splitting crack. The beam without fiber experienced brittle splitting failure, while the beams with fibers experienced ductile splitting failure. The test results showed that increasing UHPC strength and cover depth could increase bond strength. The bond strength increased linearly with fiber content from 0% to 3% but decreased with 4% fiber content. Bond strength decreased linearly with splice length. Transverse reinforcement in the lap splice effectively improved bond strength; however, when the additional confinement reaches a limit, the increase in stirrups no longer improves UHPC bond stress. The experimental study established a formula for predicting UHPC bond splitting strength, considering the influence of the above parameters. The maximum limit of bond strength contributed by the stirrup was obtained. Finally, the development length calculation model applicable to UHPC was established by modifying the NC theory method. The proposed model was compared with current design methods, and the predicted values of the proposed model were closest to the experimental values.
Development length and bond behavior of lap-spliced reinforcement in Ultra-high performance concrete beams
https://orcid.org/0000-0002-7490-9335
https://orcid.org/0000-0002-1592-7218
Highlights Seventeen UHPC lap-spliced beams are tested to simulate the flexural member bond conditions. Significant influence of UHPC compressive strength, fiber content, cover depth, splice length and transverse confinement are comprehensively analyzed. A simplified equation is developed to determine the UHPC bond splitting strength under realistic stress states. The maximum limit of bond strength contributed by the stirrup is obtained. The calculation model for the development length applicable to UHPC is established by modifying the NC theory method.
Abstract Ultra-high performance concrete (UHPC) is a new composite material that can significantly improve bond performance with steel bars. There is insufficient research on UHPC bond behavior under actual stress within structural members, which is critical for structure safety and economy. In this paper, 17 lap-spliced beams were tested to simulate flexural member bond conditions. The test parameters included UHPC compressive strength, cover depth, fiber content, splice length and stirrups in the spliced region. All specimens failed by the UHPC cover splitting crack. The beam without fiber experienced brittle splitting failure, while the beams with fibers experienced ductile splitting failure. The test results showed that increasing UHPC strength and cover depth could increase bond strength. The bond strength increased linearly with fiber content from 0% to 3% but decreased with 4% fiber content. Bond strength decreased linearly with splice length. Transverse reinforcement in the lap splice effectively improved bond strength; however, when the additional confinement reaches a limit, the increase in stirrups no longer improves UHPC bond stress. The experimental study established a formula for predicting UHPC bond splitting strength, considering the influence of the above parameters. The maximum limit of bond strength contributed by the stirrup was obtained. Finally, the development length calculation model applicable to UHPC was established by modifying the NC theory method. The proposed model was compared with current design methods, and the predicted values of the proposed model were closest to the experimental values.
Development length and bond behavior of lap-spliced reinforcement in Ultra-high performance concrete beams
Liang, Rui (author) / Huang, Yuan (author)
Engineering Structures ; 291
2023-05-17
Article (Journal)
Electronic Resource
English
Global bond behavior of enamel-coated rebar in concrete beams with spliced reinforcement
| British Library Online Contents | 2013
Bond performance of tensile lap-spliced basalt-FRP reinforcement in high-strength concrete beams
| BASE | 2021
Global bond behavior of enamel-coated rebar in concrete beams with spliced reinforcement
| Online Contents | 2013
Effect of FRP Wrapping on Fatigue Bond Behavior of Spliced Concrete Beams
| Online Contents | 2016