Second Gage Line of Bolts-Prying Action
Second Gage Line of Bolts-Prying Action
(OP)
Does a second line of bolts (a second gage) help for prying action on a "T" or single angle hanger, or is prying checked on the first bolt only?
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Second Gage Line of Bolts-Prying Action
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RE: Second Gage Line of Bolts-Prying Action
I've wondered the same thing a number of times. I keep telling myself that I'm going to look this up, but have never had the time.
When I do find the time, I will probably start with AISC Design Guides 4 and 16 for end plate moment connections. These have a number of cases where multiply lines of bolts were used. Therefore, if you get ahold of some of the referenced papers, I imagine that one of them goes into more detail about how they arrived at the procedure. Part of this will get into yield-line theory for the plates (which you may or may not be interested in), but I would think that part of it has to cover the prying action on the bolts.
RE: Second Gage Line of Bolts-Prying Action
I just don't have time to do the research, but I'd love to know.
RE: Second Gage Line of Bolts-Prying Action
RE: Second Gage Line of Bolts-Prying Action
http://www.FerrellEngineering.com
RE: Second Gage Line of Bolts-Prying Action
Thanks for the replies.
RE: Second Gage Line of Bolts-Prying Action
That is, if I have two members joined by a plate with two rows of bolts in each member; then if the bending moment being resisted is clockwise, the members "pivot" at the outside row of bolts and stretch the inner rows of bolts.
If my bending moment is counter-clockwise, then the outer row of bolts are being stretched, aren't they?
RE: Second Gage Line of Bolts-Prying Action
RE: Second Gage Line of Bolts-Prying Action
I don't have a real answer to that question, but I think it is a legitimate question....albeit an academic one. In practice though, I would think it woul be a better choice to do as Toad did and just consider the 1st line of bolts and maybe thicken the plate slightly.
RE: Second Gage Line of Bolts-Prying Action