Analysis of reinforcement prestressing impact on the bearing capacity of the dapped-ends
Abstract
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.
Article in Lithuanian.
Iš anksto įtemptos armatūros įtempimo įtakos atraminio mazgo su įpjova laikomajai galiai analizė
Santrauka
Straipsnyje analizuojama surenkamoji iš anksto įtempta stačiakampio skerspjūvio gelžbetoninė sija su įpjova atraminėje zonoje. Tiriamas neigiamas armatūros įtempimo poveikis atraminio mazgo su įpjova laikomajai galiai. Sudaromas skaitinis sijos modelis grindžiamas eksperimentiniu bandiniu ir atliekama netiesinė analizė naudojant DIANA FEA programinį paketą, siekiant nustatyti skirtingo armatūros įtempimo intensyvumo poveikį mazgo laikomajai galiai. Rezultatai lyginami su analitiniais skaičiavimais ir literatūroje aprašoma elgsena. Nustatyta, kad armatūros įtempimas smarkiai mažina atraminio mazgo su įpjova laikomąją galią, kai įtempta armatūra nepratęsiama iki sijos galo virš įpjovos. Skaitinio modelio laikomoji galia dėl įtempimo sumažinama 9,67 %, o analitiniais skaičiavimais – 25 %. Projektuojant sijas su įpjova atraminiame mazge, būtina įvertinti įtemptosios armatūros poveikį mazgo laikomajai galiai ir pleišėjimui.
Reikšminiai žodžiai: iš anksto įtemptas gelžbetonis, jungtis su įpjova, sija su įpjova atraminėje zonoje, netiesinė analizė, skaitinė analizė, skaitinis modelis, surenkamoji gelžbetoninė sija.
Keyword : prestressed reinforced concrete, dapped-end beam, half-joint, nonlinear analysis, numerical analysis, numerical model, precast reinforced concrete beam
This work is licensed under a Creative Commons Attribution 4.0 International License.
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