Question: Determine the lightest W 1 2 section that can be used using ASD for members in Group A in the bottom chord of the truss

Determine the lightest W12 section that can be used using ASD for members in Group A in the bottom chord of the truss shown.
There are four rows of 16mm bolts in a section as shown and it can be assumed that there are 3 or more bolts in each row.
The factored loads Pu=285kN. Use A-36 steel.
Section
Determine the lightest W 1 2 section that can be

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