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+clear
+//given
+//from example 6.9
+St_ul = 2500 //psi - ultimate strength
+st_yl = 40000 //psi _ yielding strength
+b = 10 //in - width from example
+A = 2 //in2 The area of the steel
+d = 20
+t_ul = st_yl*A //ultimate capasity
+y = t_ul/(St_ul*b*0.85) //in 0.85 because its customary
+M_ul = t_ul*(d-y/2)/12 //ft-lb Plastic moment
+printf("\n The plastic moment of the system is %0.3f ft-lb",M_ul)