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Structural Engineering and Mechanics Volume 61, Number 5, March10 2017, pages 577-592 DOI: http://dx.doi.org/10.12989/sem.2017.61.5.577 |
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Prestressed concrete beams under torsion-extension of the VATM and evaluation of constitutive relationships |
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Luís F.A. Bernardo and Jorge M.A. Andrade
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| Abstract | ||
| A computing procedure is presented to predict the ultimate behavior of prestressed beams under torsion. This computing procedure is based on an extension of the Variable Angle Truss-Model (VATM) to cover both longitudinal and transversal prestressed beams. Several constitutive relationships are tested to model the behavior of the concrete in compression in the struts and the behavior of the reinforcement in tension (both ordinary and prestress). The theoretical predictions of the maximum torque and corresponding twist are compared with some results from reported tests and with the predictions obtained from some codes of practice. One of the tested combinations of the relationships for the materials was found to give simultaneously the best predictions for the resistance torque and the corresponding twist of prestressed beams under torsion. When compared with the predictions from some codes of practice, the theoretical model which incorporates the referred combination of the relationships provides best values for the torsional strength and leads to more optimized designs. | ||
| Key Words | ||
| PC beams; torsion; longitudinal and transversal prestress; VATM; stress-strain relationships | ||
| Address | ||
| Luís F.A. Bernardo and Jorge M.A. Andrade: Department of Civil Engineering and Architecture, Centre of Materials and Building Technologies (C-made),University of Beira Interior, Covilhã, Portugal | ||