A built-up section consisting of W 350 x 90 which 15 mm plates welded to form a box section as shown in figure. The section is used as a column 12 m meters long carring a deadload of 2000 kN. The column is braced at both ends, and braced at mid height about the weak axis (Y-axis). Use Pu = PD + PLL for allowable axial load and Pu= 1.2 PD + 1.6 Pu for service axial load. Fy 250 Mpa. Properties ; bf = 200 mm Ix = 324 x 106 mm4 tf = 22.5 mm ly = 57.34 x 106 mmª d = 400 mm tw = 15.2 mm y 200 mm 400 mm ++ Is mm 15 mm W 350 x 90 a) Determine the axial live load of the column using the ASD 2015 NSCP. b) Determine the safe service live load of the column using the LRFD 2015 NSCP.

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