Any thoughts or comments?
Take a look at Section 721.6.3 for calculated fire resistance of exposed wood members.
For example, if an 8x8 column is exposed on all four sides, is loaded to only 50% of its capacity, and has an (Ke)l/d less than or equal to 11, then it has a 1-hour rating:
Z = 1.50 [per Figure 721.6.3(1)]
d = 8 inches
b = 8 inches
(2.54)(1.50)(8)[3-(8/8)] = 60.96 minutes
If the column is only exposed on three sides, the time would be slightly higher (76.2 minutes).
Also consider the CAM method for calculating fire-resistive rating of an assembly. Here is more:
I'm also attaching the "Design of Fire-Resistive Exposed Wood Members" by the American Wood Council (AWC). It has information about wood beams and columns.
For an exhaustive reading about this subject, Technical Report 10, "CALCULATING THE FIRE RESISTANCE OF EXPOSED WOOD MEMBERS" by AF&PA is your best bet: