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+b=250//width, in mm
+D=350//depth, in mm
+Asc=4*0.785*22^2//four 22 mm dia bars, in sq mm
+Lef=5//effective length of column, in m
+sigma_cc=4//in MPa
+sigma_sc=130//in MPa
+a=Lef*10^3/b
+//as Lef/b > 12, it is a long column
+Cr=1.25-Lef*1000/(48*b)//reduction coefficient
+sigma_cc=Cr*sigma_cc//in MPa
+sigma_sc=Cr*sigma_sc//in MPa
+Ag=b*D//in sq mm
+Ac=Ag-Asc//in sq mm
+P=sigma_cc*Ac+sigma_sc*Asc//in N
+mprintf("The safe load on the column=%f kN", P/10^3)