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+P=500//in kN
+Pu=1.5*P//in kN
+fck=15//in MPa
+fy=250//in MPa
+l=3//unsupported length, in m
+//assume 1% steel
+Ag=Pu*10^3/(0.4*fck*0.99+0.67*fy*0.01)//in sq mm
+b=250//in mm
+D=Ag/b//in mm
+D=400//round-off, in mm
+emin1=l*10^3/500+D/30//in direction of Y axis, in mm, < 20 mm
+emin1=20//in mm
+ep1=0.05*D//=emin, hence no moment is required to be considered in this direction
+emin2=l*10^3/500+b/30//in direction of X axis, in mm, < 20 mm
+emin2=20//in mm
+ep2=0.05*b//<emin, hence moment in this direction needs to be considered
+//interaction diagram
+b=400//in mm
+D=250//in mm
+Mu=Pu*10^3*emin2//in N-mm
+m=Pu*10^3/fck/b/D
+n=Mu/fck/b/D^2//b=0.032
+d1=40//cover(assume), in mm
+c=d1/D//c=d'/D
+//referring to Fig. 19.12
+p=0.08*fck//in %
+Asc=p/100*b*D//in sq mm
+//provide 6-16 dia bars
+Asc=6*0.785*16^2//in sq mm
+mprintf("Summary of design:\nColumn size - %d x %d mm\nSteel-main = 6-16 mm dia bars",D,b)