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Designs 2018, 2(2), 12;

Parametric Study of the Behavior of Longitudinally and Transversally Prestressed Concrete under Pure Torsion

C-MADE-Centre of Materials and Building Technologies, Department of Civil Engineering and Architecture, University of Beira Interior, Edifício II das Engenharias, Calçada Fonte do Lameiro, 6201-001 Covilhã, Portugal
Author to whom correspondence should be addressed.
Received: 28 March 2018 / Revised: 19 April 2018 / Accepted: 20 April 2018 / Published: 24 April 2018
(This article belongs to the Special Issue Integrated Sustainable Building Design, Construction and Operation)
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Among several analytical models to describe the behavior of reinforced concrete (RC) and longitudinally prestressed concrete (LPC) beams under torsion, the Modified Variable Angle Truss Model (MVATM) is particularly efficient to capture the behavioral states of the member until failure and agree well with experimental results. This article aims to extend the MVATM to cover transversally prestressed concrete (TPC) beams under torsion. The changes in the formulation and calculation procedure of the original VATM, in order to include the influence of transversal prestress, are presented. The extended MAVTM is then used to compute the global response of LPC and TPC beams under torsion with similar total prestress reinforcement ratios, namely the torque–twist curves. The obtained predictions are then compared and discussed. It is shown that for the ultimate loading, transversal prestress constitutes also an effective solution to improve the behavior of the beams under torsion. However, transversal prestress is less effective to delay the cracked state. Finally, it is also shown that when prestress is distributed in both longitudinal and transversal direction, the global response of the beams under torsion is further improved, namely the resistance torque and the torsional stiffness in the cracked state. View Full-Text
Keywords: Prestress Concrete; beams; torsion; Modified Truss Model; parametric study Prestress Concrete; beams; torsion; Modified Truss Model; parametric study

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Bernardo, L.; Andrade, J.; Teixeira, M. Parametric Study of the Behavior of Longitudinally and Transversally Prestressed Concrete under Pure Torsion. Designs 2018, 2, 12.

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