AISC table J3.2 foot notes
AISC table J3.2 foot notes
(OP)
Hi,
In AISC table J3.2, there is a foot note regarding fastener pattern length. I am having hard time understanding fastener pattern length definition. Is there a figure or something which they refer to, which shows the 38'' dimension.
Thanks
In AISC table J3.2, there is a foot note regarding fastener pattern length. I am having hard time understanding fastener pattern length definition. Is there a figure or something which they refer to, which shows the 38'' dimension.
Thanks






RE: AISC table J3.2 foot notes
What they are worried about here is that with very long bolted connections, with many bolts, you could get an irregular distribution of shear on individual bolts and the 0.833 factor accounts for this.
Read the commentary on Section J3.6 where they discuss this a bit. In my 14th Edition Manual it is on page 16.1-403.
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RE: AISC table J3.2 foot notes
This would require a clip angle of about 42 inches in length. The distance between your top and bottom bolts is (14-1) x 3" = 39" which is greater than the 38". Thus, the 0.833 factor would be required.
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RE: AISC table J3.2 foot notes
An example of an end-loaded connection would be a flange plate axial connection on this girder. The flange force is in the plate all at once, but has to distribute to the beam along the length of the connection. If the bolt pattern exceeds 38" in length, you need the 0.833 factor.
I've heard this described in seminars, but I don't recall seeing a sketch that shows it.
RE: AISC table J3.2 foot notes
https://www.aisc.org/globalassets/modern-steel/arc...
RE: AISC table J3.2 foot notes
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RE: AISC table J3.2 foot notes
RE: AISC table J3.2 foot notes
RE: AISC table J3.2 foot notes
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RE: AISC table J3.2 foot notes