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+b=300//width, in mm
+d=650//effective depth, in mm
+Ast=942//in sq mm
+lef=6//in m
+fck=20//in MPa
+fy=340//in MPa
+Xu=round(0.87*fy*Ast/0.36/fck/b)//in mm
+Xc=0.5*d//in mm
+//as Xu<Xc, it is under-reinforced beam, hence OK
+Mu=0.87*fy*Ast*(d-0.416*Xu)/10^6//in kN-m
+Wu=Mu*8/lef^2//in kN/m
+self_weight=25*(b/1000)*(d/1000)//in kN/m
+W=Wu/1.5-self_weight//in kN/m
+mprintf("Safe load on the beam=%f kN/m",W)