Title: Torsion of Rectangular Concrete Sections
Author(s): Jan L. Vítek, Lukáš Boháček, Jaroslav Průša, Vladimír Křístek
Publication: Symposium Paper
Appears on pages(s): 111-130
Keywords: arch bridge, concrete, cracking, rectangular section, reinforcement, torsion
The paper deals with torsion of rectangular concrete sections. The pre-cracking stage and post-cracking
stage are discussed. The various design procedures are briefly mentioned and compared. The deficiencies of some
methods are identified and discussed. The major part of the paper deals with the results of an experimental program
executed at the Czech Technical University. The large-scale elements were tested under loading by torsion and by
interaction of torsion and compression. The results showed that the effect of the compression force on the load
carrying capacity of the elements in torsion differs according to the stage of performance. While at the pre-cracking
stage the contribution of the compression is rather significant, when approaching the failure, it becomes reduced.
Simplified technical methods of design of reinforcement were also discussed. It has been proved that the effect of
the angle of the compressed diagonal in code models is rather important. The study showed that this effect is
sometimes overestimated. Finally, in conclusions, some recommendations for future research are proposed.