Top of Column Brace at Glulam Roof Beam

[Triangled]

In preparation for a single story retail building inspection in a few days, I came across the attached detail in the partial plans provided to me. The roof diaphragm is plywood or osb and is about 20' above the slab. The beam shown is a 6 3/4" x 33" beam. I don't yet know the column size. I don't see any column bracing indicated in the plans, so that will be one of the items I check onsite.

Could the column cap shown provide adequate bracing for the top of column? To check it, would it be a matter of checking the cap side plates for bending for an out of plane load of some percentage of the vertical load on the column?

Thanks.

 

[dhengr]

Triangled:
That’s a fine detail for taking the gravity load from the GluLam beam to the col. It doesn’t offer much lateral restraint at the top of that pinned col. though. And, what prevents that 33" deep beam from rolling w.r.t. the col. cap pl. under some loading conditions? That wood to steel connection doesn’t offer much reliable moment cap’y. at that connection. There might be some diag. bracing from roof purlins to the top of the col. Some consideration of this should have been part of the beam, column and entire roof system design. The whole structure then needs some form of bracing system. Part of that might be (likely is) the plywd. roof diaphragm properly tied into exterior walls, or a bracing system in the exterior walls.

 

[Triangled]

Yup, I am thinking the same thing.

I am hoping to find diagonal bracing from the top of supported purlins to the bottom of these girders when I arrive onsite.

But I'm preparing myself now, and wondering if, in the absence of such bracing, if I should just automatically require it or attempt to find some method of justifying this connection as it is.

 

[XR250]

If the plates ran up to the top of the beam and the bolts were spaced farther apart, it would provide rotational restraint.
Why wouldn't it? I would switch to 3/8" plates just from a practical standpoint, however, as they won't bend as easy during transportation and construction.