09-10-2014, 03:30 PM
This work presents expressions of curvature ductility of reinforced concrete rectangular sections. The material stress-strain behaviour and the definition of ductility have been reviewed from the literature. A detailed parametric study has been carried out to observe the effect of various variables m ductility and moment carrying capacity of the section. Variables selected to incorporate in the expression of curvature ductility are (i) ratio of axial load on the section to the product of gross cross sectional area, and characteristic strength of concrete, (ii) ratio of amount of tension steel to the gross cross sectional area, (iii) ratio of amount of longitudinal compression steel to tension steel, (iv) volumetric ratio of transverse reinforcements, (v) ratio of core area to gross cross sectional area, and (vi) ten times characteristic strength of concrete to the yield strength of longitudinal steel. A linear regression analysis is carried out to obtain the statistical models of various variables versus ductility. Then the effect of different variables are combined toge