It is always advisable to brace the so-called bottom "tension" chord of a roof truss because of the possibility of a reversal of forces (tension to compression) due to wind loadings on the building. Such bracing also controls the slenderness ratio for the bottom chord and the web members of the...
Over a 30 year period of designing structures I have assiduously avoided referring to load tables, of any description, for the selection of beams.
Structural members should be designed for strength, serviceability (deflection) and durability.
Generally, my experience is that deflection/sway is...
You have not specified the column load.
The first problem is to transfer the column load to the footing - so check the "punching" or peripheral shear around the base of the column. If this is excessive, then some form of remedial work is required.
The second problem is the soil bearing...
