(c) What is the most effective way of increasing OM,? What is the least effective way? Beam fy No. (in.) (in.) Bars (psi) (psi) 1 12 22 3 No. 7 4000 60,000 12 22 2 No. 9 plus 1 No. 8 4000 60,000 3 12 22 3 No. 7 4000 80,000 4. 12 22 3 No. 7 6000 60,000 12 33 3 No. 7 4000 60,000