Abstract
Abstract Most of torsion studies available are relative to pure torsion, arising from the exclusive application of a torsion moment in a concrete beam. This situation, however, is only possible in laboratories. In practice, the vast majority of twisted beams are subjected to the combination of shear forces and torsion, which gives rise to a more complex state of stress to be analyzed. The purpose of this paper is to present the provisions of the ACI 318/2014 Codes, AASHTO and ABNT NBR 6118: 2014 related to shear and torsion, and compare some results with experimental data from Rahal & Collins[3]. It is shown that if the recommended value of 45º is used for θ, the ACI 318/2014 provisions for shear-torsion interaction give similar results compared to ABNT NBR6118: 2014, but these results are very conservative. If the lower limit of 30º is used, the results obtained using both codes departs, and less consistent results are obtained. This paper concludes that using the recommended value of 36º obtained with the AASHTO provisions, some consistent and more accurate results are obtained.
Highlights
Since the beginning of Century XX, torsion has been studied based on the fundamental concepts of Material Engineering and the Theory of Elasticity
The purpose of this paper is to present the provisions of the ACI 318/2014 Codes, AASHTO and ABNT NBR 6118: 2014 related to shear and torsion, and compare some results with experimental data from Rahal & Collins[3]
Based on the results presented by Leonhardt & Mönnig and on the design of the space truss, the Brazilian Standard Code ABNT NBR 6118:2014 indicates a calculation model for reinforced concrete beam elements subjected to torsion
Summary
Since the beginning of Century XX, torsion has been studied based on the fundamental concepts of Material Engineering and the Theory of Elasticity. The first researchers that were recognized by their studies in finding out a solution for the torsion problem in structures were Saint-Venant and Prandtl. After that, another scientist that must be highlighted because of his great contribution to applied mechanics was Bredt, who offered a promising solution to the Saint-Venant torsion problem, using thin-wall hollow section tubes. He considered the beam behavior analogous to an isostatic truss, in which the upper and lower chords are parallel, and represented respectively by the region of the compression concrete and the longitudinal tensile reinforcement bars of the beam.
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