Adding a Timber POST to a steel POST = OK?
Adding a Timber POST to a steel POST = OK?
(OP)
The structure is in the middle of construction, and the builders have found a layout problem:
A the top levels of a 3 story structure sit on a steel beam which is supported by a steel column. The builders have discovered that the walls above do not sit on top of the steel beam below. They would like to offset the steel beam from the steel column.
This beam/post only supports gravity loads, but adding and offset post will create a moment in the column due to the added eccentricity that the column cannot support.
The base plate and column are already bolted down. The column has stud bolts welded to the side so that nailers can be countersunk on.
Can they use these studs to attached a full height timber post to the side of the column?
In my head it seems like there would be a problem because of the new nonhomogeneous materiel, but both posts, steel and timber, can easily take 1/2 of the axial load.
Any thoughts without a picture???
A the top levels of a 3 story structure sit on a steel beam which is supported by a steel column. The builders have discovered that the walls above do not sit on top of the steel beam below. They would like to offset the steel beam from the steel column.
This beam/post only supports gravity loads, but adding and offset post will create a moment in the column due to the added eccentricity that the column cannot support.
The base plate and column are already bolted down. The column has stud bolts welded to the side so that nailers can be countersunk on.
Can they use these studs to attached a full height timber post to the side of the column?
In my head it seems like there would be a problem because of the new nonhomogeneous materiel, but both posts, steel and timber, can easily take 1/2 of the axial load.
Any thoughts without a picture???





RE: Adding a Timber POST to a steel POST = OK?
Wood's E value is about 1200 to 1600 ksi. A multiple difference of 24 times.
The wood might not help much because of that and I certainly wouldn't count on any composite behavior between the two.
If the wood post is directly below the beam, then perhaps the load would come down direct on the wood and the steel would serve as a lateral brace to the wood.
How is the beam attached to the two?
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RE: Adding a Timber POST to a steel POST = OK?
RE: Adding a Timber POST to a steel POST = OK?
Follow the load all the way down to the foundation. Loads like clean paths, the simpler the better!
RE: Adding a Timber POST to a steel POST = OK?
Mike McCann, PE, SE (WA)
RE: Adding a Timber POST to a steel POST = OK?
I had the same feeling as most everyone above: the steel is stiff and will take the load and the timber wouldnt do much. Another engineer was sure it would be ok. (What?)
to answer a few of the questions:
The W12x is offset 4" max and 1" min.
There is a concrete curb on either side of the base plate and the post connection cannot be moved.
This is a raised podium design so the footing can accommodate the relocated concentrated load. \
The beam attaches to a top plate that is welded to the top of the steel column.
RE: Adding a Timber POST to a steel POST = OK?
RE: Adding a Timber POST to a steel POST = OK?
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