Shear Strength of Post-Tensioned Daps in Prestressed Concrete Beams

Hamoudi, Ali A.; Phang, Michael K.

doi:10.1061/jsdeag.0003946

Cited by 2 publications

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“…Daugelyje tyrimų įtempta armatūra išdėstoma atlankomis iki sijos galo, todėl pleišėjimo ir įstrižojo pjūvio laikomoji galia didėja (Hamoudi & Phang, 1974;Nanni & Huang, 2002;Moreno-Martínez & Meli, 2014). Brinkley'us tyrime armatūrą išdėsto tiesiais strypais įtempiant įpjovoje, tačiau šlyties suirtis vyksta viso aukščio skerspjūvio dalyje, todėl laikomoji galia nuo apspaudimo taip pat didėja (Brinkley, 2013).…”

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Analysis of Reinforcement Prestressing Impact on the Bearing Capacity of the Dapped-Ends

Masėnas

2023

Science - Future of Lithuania

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The article analyzes a prestressed reinforced concrete dapped-end beam of a rectangular cross-section. The negative effect of reinforcement prestressing on the bearing capacity of the dapped-end is analyzed. The numerical beam model is made based on an experiment and a nonlinear analysis is performed using the DIANA FEA software package to determine the effect of different intensity of reinforcement prestressing on the bearing capacity of the dapped-end beam. The results are compared with analytical calculations and the behavior described in the literature. The prestressing of the reinforcement is shown to reduce the bearing capacity of the dapped-end when tensioned reinforcement is not extended to the end of the beam above the notch. The load capacity of the numerical model is reduced by 9.67% and reduced by 25% based on analytical calculations. When designing dapped-end beams, it is necessary to assess the effect of reinforcement prestressing on the bearing capacity and cracking.

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Section: įVadasunclassified

Analysis of Reinforcement Prestressing Impact on the Bearing Capacity of the Dapped-Ends

Masėnas

2023

Science - Future of Lithuania

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Analysis of the Bearing Capacity of Reinforced Concrete Dapped-End Beams

2023

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The dapped-end beam is a widely utilized structural component that offers many benefits in real-world applications. However, abrupt changes in the geometry result in complex stress flows, rendering conventional calculation methods unreliable. The estimation of the bearing capacity becomes particularly challenging when such elements are designed with prestressed reinforcement. Previous studies have identified that prestressing can have a negative impact on the behavior of dapped-end beams in specific configurations; however, this effect remains inadequately studied. This study employed both analytical and numerical parametric analyses to compare the behavior of prestressed and non-prestressed dapped-end beams. The results show that prestressing has a significant impact on the crack formation and bearing capacity of dapped-end beams. The intensity of this effect is dependent on various parameters, including shear reinforcement, concrete strength, height of the dap, and the distance between the support and the re-entrant corner. A reduction of approximately 50% in the cracking load was observed when the compressive stress ratio fell within the 0.20–0.25 range. At elevated prestressing levels, cracks emerged in the re-entrant corner prior to the beam being subjected to an external load. The analysis conducted revealed a decline of up to 8.81% in load-bearing capacity attributable to prestressing. The study highlights the importance of assessing reductions in bearing capacity and proposes an analytical calculation model for evaluating such reductions.

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Shear Strength of Post-Tensioned Daps in Prestressed Concrete Beams

Cited by 2 publications

References 0 publications

Analysis of Reinforcement Prestressing Impact on the Bearing Capacity of the Dapped-Ends

Analysis of Reinforcement Prestressing Impact on the Bearing Capacity of the Dapped-Ends

Analysis of the Bearing Capacity of Reinforced Concrete Dapped-End Beams

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