Title: Diagonal Compression Field theory-A Rational Model For Structural Concrete in Pure Torsion

Author(s): Denis Mitchell and Michael P. Collins

Publication: Journal Proceedings

Volume: 71

Issue: 8

Appears on pages(s): 396-408

Keywords: beams (supports); bending; compression; com-pressive strength; concretes; cover; deformation; failure mechanism; loads (forces); mathematical models; pre-stressed

DOI: 10.14359/7103

Date: 8/1/1974

Abstract:
Presents a theoretical model for structural concrete in pure torsion which is comparable in rationality and generality to the well known theory for flexure. As in flexure, the theory is formulated by considering the equilibrium condi-tions, the geometry of deformation, and the stress-strain characteristics of the steel and the concrete. The model is capable of predicting the complete post-cracking torsional behavior of symmetrically reinforced structural concretemembers. In the paper the theory is applied to the felling cases: the torsional response of reinforced and stressed concrete members; the torsional capacity of und reinforced, partially over-reinforced and completely 0 reinforced members; and the prediction of balanced reinforcement ratios. [Authors]