Determine the forces FA, FB& FC and compute the lightest W12 sections that can be LRFD for tension members in Group A,

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Determine the forces FA, FB& FC and compute the lightest W12
sections that can be LRFD for tension members in Group A, B
& C in the bottom chord of the truss shown. There are four rows
of 16mm Ø bolts in a section as shown and it can be assumed that
there are 3 bolts in each row. The factored load Pu=270kN. Use A-36
Steel and Table NSCP Steel Chapter 504.3.1 Shear Lag Factors for
Connection to Tension Members. Use Equation 504-3.1Note: Use
Equation 504.2-1 & 504.2-2 for tensile and rupture Formula and
2mmallowanceper Section 504.3.2for bolt hole diameter.