Techno Press
Techno Press

Structural Engineering and Mechanics   Volume 23, Number 6, August20 2006, pages 713-737
Experimental study of the torsion of reinforced
concrete members
Constantin E. Chalioris

Abstract     [Full Text]
    This paper presents the results of an experimental investigation on the behaviour of 56 reinforced concrete beams subjected to pure torsion. The reported results include the behaviour curves, the failure modes and the values of the pre-cracking torsional stiffness, the cracking and ultimate torsional moments and the corresponding twists. The influence of the volume of stirrups, the height to width ratios and the arrangement of longitudinal bars on the torsional behaviour is discussed. In order to describe the entire torsional behaviour of the tested beams, the combination of two different analytical models is used. The prediction of the elastic till the first cracking part is achieved using a smeared crack analysis for plain concrete in torsion, whereas for the description of the post-cracking response the softened truss model is used. A simple modification to the softened truss model to include the effect of confinement is also attempted. Calculated torsional behaviour of the tested beams and 21 beams available in the literature are compared with the experimental ones and a very good agreement is observed.
Key Words
    angle of twist; beams; reinforced concrete; smeared crack model; softened truss model; stress-strain relationships; torsional stiffness; torsion; torsion tests.
Democritus University of Thrace, Department of Civil Engineering, Xanthi 671 00, Greece

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