Study on Variability of Mechanical Properties of Steel Rebars

Steel rebars are widely used in construction as reinforcement in reinforced concrete elements and for prestressing applications. The actual mechanical properties of steel bars might deviate from the specified values for a number of reasons. This deviation in mechanical properties increases the effect of material strength variability on the uncertainty associated with structural design. In this study, a statistical approach is undertaken for the variability analysis of Grade 60 steel rebars using 200 test data of different bar sizes. Beta and normal are employed to represent the variation in the in the yield strength, ultimate strength, bar diameter, and elongation. The Kolmogorov–Smirnov and Anderson darling goodness-of-fit test is carried out to identify the most suitable distribution for the considered properties.