During the last four decades many equations have been proposed to estimate the shear strength of reinforced concrete (RC) beams. However, in terms of accuracy and uniformity of the prediction, there is considerable diversity between existing test results and concrete design code requirements and researchers' predictions. In this study, by considering the size effect of RC slender beams without stirrups, a new design expression is proposed for cracking shear strength. The proposed equation and also other eight different code requirements and researchers' predictions are compared with the test results of 249 beams without stirrups. It is found that the proposed equation shows good agreement with regard to existing test results. Thus, the proposed equation is used for the resistance of concrete to obtain the shear strength of RC slender beams with stirrups. The proposed equation is verified by comparing the results of the existing 248 shear tests carried out with RC slender beams with stirrups covering a wide range of beam properties and test methods.
Abstract. The ductility of reinforced concrete beams is very important, since it is essential to avoid a brittle failure of the structure by ensuring adequate curvature at the ultimate limit state. One of the procedures used to quantify ductility is based on curvatures, namely, curvature ductility. It is necessary to know the curvature ductility of singly reinforced highstrength concrete (HSC) sections for determining a maximum permissible tensile reinforcement ratio or a maximum depth of the concrete compression area in design codes. The requirements of several codes and methods of prediction of the curvature ductility are based on the experimental results of normal strength concrete (NSC). The rules derived for NSC sections may not be appropriate for HSC sections, and verifications and modifications may be required for the evaluation of curvature ductility of HSC sections. In this study, the major factors affecting the curvature ductility of a singly reinforced HSC beam section are investigated. Based on numerical analyses, a parametric study has been carried out to evaluate the effects of various structural parameters on the curvature ductility of reinforced HSC beam sections.
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