N= (mc)/(t+mc)Where N = Critical Neutral AxixConstant. J. =1- (N/3)Where J is known as Lever arm constantR=(1/2)JNcd= sq root ([BM]/[Rb])At = (BM)/(t.J.d)Where At = Area of tensile steel.T = Allowable tensile stress in steel.[Ast/bd]=[0.85/fy]