I've calculated all of the loads/reactions for my barn/shop and now I'm selecting beams and columns. My ridge-beam and center girder will be supported at the gable ends. I can't seem to find a good reference table for built-up columns. I guess it would be similar to a "number of jack studs under a header" table only I need to support 7337lbs. at each end (for the ridge beam) and 3742lbs. (for the center girder). One of the gable ends may be a column straight to the ground the other will probably involve headers transferring the load around windows/doors. Just trying to see if built up lumber support will work or if I should purchase engineered products (like a PSL) for these columns.
I can't remember if the WSDD manual from awc.org has column capacities in it.
I've got a couple of calcs up, one is here;
http://www.timbertoolbox.com/Calcs/columncalc.htm
built up is fine when sheathed to hold the plies and weak direction together and fixed against buckling. It takes very good nailing as a stand alone column. A solid post is superior because of that when possible and the way to go for a freestanding post IMO but I've used more built up columns than solid in frame walls.
Yes, Wood Structural Design Data does have a column chapter and tables, read the precautions on built up columns in the opening basically they are good for 60% IF well connected.
Thanks Don!!! [cool]