Title: Torsion of Rectangular Concrete Sections

Author(s): Jan L. Vítek, Lukáš Boháček, Jaroslav Průša, Vladimír Křístek

Publication: Symposium Paper

Volume: 344

Issue:

Appears on pages(s): 111-130

Keywords: arch bridge, concrete, cracking, rectangular section, reinforcement, torsion

DOI: 10.14359/51728293

Date: 10/1/2020

Abstract:
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.