huangyhg

can you combine glulams and df-l boards for a post?
i am trying to help a friend out with his 2-story barn structure which consists/upported by braced frames in one direction. the braced frame problem i have consists of a 6x12 df-l no.1 girder, supported by a post on each side, and the girder is further supported by 6x6 knee-braces connecting the girder and post on each side. the post was originally designed to be a composite member (a 6x10 with a 2x12 nailed to each side for additional support/inertia). this worked for a 23' total span with a live load of 40 psf and a dead load of 14.2 psf. it turns out that the girder supporting the second floor must support 125 psf instead of 40 psf because it's an agricultural building and the 2nd story is considered "light storage" according to officials and the ubc 97. so now we have to redesign the posts. what may work, and please correct me if i'm totally wrong, for the posts, i want to use a 5-1/2" x 10-1/2" glulam. the glulam alone is close, but i need additional support (need more moment capacity because the knee-brace from the girder is bending the post). my question (finally) is , can i attach/nail a 2x12 df-l to each side of this glulam and reap the benefit of those boards providing the required extra moment i need? the 2x12's also hide the fact i am using a glulam, which the architect is not fond of seeing. i'm trying to shy away from larger glu-lam members, and the 5-1/2' width matches perfectly for the plate connection with the 6x6 knee braces.
can i even use a glu-lam beam as a post in the first place? and will the fact the the glulam and the boards have different f'b not allow me to count this a composit post? sorry for the long winded question. if any one help me, i'd greatly appreciate your answers or ideas?
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arcoiris74,
i've never used a glulam as a compression member although i guess it would work well at least in terms of load capacity. you probably should check with the manufacturer to see if they would have any concerns about the possibility of the plys separating when loaded in compression on the end of the

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