円形断面を有するRC部材のせん断挙動

Abstract

The theory of shear behavior for RC circular members proposed in this paper is based on the diagonal compression field theory. The aggregate interlock of cracked section and the dowel action of longitudinal steel are ignored in the model. The influence of non-uniform of stirrup strain is discussed and it is thought that the influence is negligible. According the model, the shear stress-shear strain relationship for circular members can be predicted. For ascending branch, predicted curves show a good agreement with test curves. For specimens with light stirrups, there is difference between theoretical curve and test curve in descending branch. The theory predicts that the angle of diagonal compression will vary with shear stress. Before the yield of stirrup, the inclined angle will increase as stress increase; and will decrease after the stirrup have yielded. While concrete strain has reached peak strain, the inclined angle will increase once again. The shear strength equation proposed in this paper which includes the effect of axial force is expressed in a simple form which is convenient to use, and is consistent with one which does not include axial force.