Steel Joists Bearing on Masonry Wall
Steel Joists Bearing on Masonry Wall
(OP)
I'm looking at Section 5.3(a) in the SJI Standard Specifications and trying to wrap my head around the bearing requirements of steel joists on masonry walls. It says (in my words) that the joist shall extend not less than 4" over the masonry support and that the steel bearing plate can extend no more than 1/2" past the face of the wall. So, if I have an 7 5/8" wall thickness and allow the plate to overhang the wall 1/2" on each side, I can still get the minimum required 4" bearing length and allow for a small gap between joists (see attached sketch). Is that correct or am I misinterpreting the requirements?






RE: Steel Joists Bearing on Masonry Wall
RE: Steel Joists Bearing on Masonry Wall
RE: Steel Joists Bearing on Masonry Wall
Bottom line check with the specific joist manufacturer to find out what they accept.
Jim H
RE: Steel Joists Bearing on Masonry Wall
Each joist shoe would bear a minimum of 2 1/2" on the steel plate as provided in 5.3(a) of the SJI Standard.
BA
RE: Steel Joists Bearing on Masonry Wall
It seems to say in 5.3(a) that for the masonry wall bearing application, with the steel plates that 4" of bearing depth is required for "K" trusses, whereas, in 5.3(b), for bearing directly on the flanges of steel beams, only 2.5" of end bearing length is required for "K" trusses.
Two different situations here... I am looking on pages 239 and 240 in the specification section in my SJI 60 year manual...
Mike McCann, PE, SE (WA)
RE: Steel Joists Bearing on Masonry Wall
I attach a page from the SJI document.
The operative words in 5.3(a) are "unless it is deemed necessary to bear less than 4" (104 mm)". It is up to the specifying professional. If I were the specifying professional, I would deem it necessary to bear less than 4". Bearing on steel beams requires a minimum bearing length of 2 1/2". I see no reason why this situation is any different.
BA
RE: Steel Joists Bearing on Masonry Wall
Mike McCann, PE, SE (WA)
RE: Steel Joists Bearing on Masonry Wall
Whether a joist bears on a steel bearing plate or a steel beam flange, it is steel to steel contact. What is the justification for requiring a greater bearing length for a plate than a flange? (irrespective of what your manual says)
BA
RE: Steel Joists Bearing on Masonry Wall
regarding the steel plate. I am just saying what I think the spec says here.
Mike McCann, PE, SE (WA)
RE: Steel Joists Bearing on Masonry Wall
Mike McCann, PE, SE (WA)
RE: Steel Joists Bearing on Masonry Wall
I checked and my copy does not read that way at all. You must have a more recent version than mine -1985.
Mike McCann, PE, SE (WA)
RE: Steel Joists Bearing on Masonry Wall
I don't have a hard copy at all. I found a 2010 version of it on the internet:
http://www.newmill.com/pdfs/steeljoists-sec4.pdf
BA
RE: Steel Joists Bearing on Masonry Wall
The bearing plate just has to be specially engineered if bearing less than 4" in depth on the masonry.
Mike McCann, PE, SE (WA)