FLEXURAL STRESS-STRAIN RELATIONSHIP OF CONCRETE CONFINED BY RECTANGULAR TRANSVERSE REINFORCEMENT

To understand the plastic deformation capacity of critical regions reinforced with longitudinal and transverse reinforcement, it was felt that the stress-strain relationship of bound concrete in flexure must first be established. Sixteen specimens were tested in a specially constructed testing frame under the action of a major and a minor load. The stress-strain relationship for the concrete was obtained by an approach similar to that used by Hognestad, Hanson and McHenry in conjunction with a special graphical interpolation technique. A generalized relationship was finally developed expressed as a function of: the spacing of binders; the ratio of the bound area to the total area under compression; the size of the binders; and the shape of the concrete cross-section. © 1967, Thomas Telford Ltd. All rights reserved.