PART B: OPEN CODE. AISC 14TH ED. ONLY 7. Select the most economical MT 5 structural tee for the bottom chord of the Warren roof truss below. The roof trusses are welded and spaced at 20 feet. Assume that the bottom chord connection is made with 9-inch-long longitudinal welds at the flange. Use A992 steel and the following load information. Neglect Block Shear. M8 x 6.5 20 psf of horizontal projection Purlins: Snow: Metal deck: 2 psf Roofing: 4 psf Insulation: 3 psf Truss Weight: 10% of the other service loads 8@ 5'-0" 40'-0" = MT5 Weld 4'