Fabricator substituting standard holes with short-slotted
Fabricator substituting standard holes with short-slotted
(OP)
Fabricator is asking for short-slotted holes where we spec'd standard holes. Steel member is a "typical" simple-span W-shaped beam with only gravity loads. Fabricator shows slots perpendicular to load (horizontal) as we'd like to see them. Connection is pretty standard stuff (from my vantage point) - designed as bearing with high strength bolts, threads included, finger-tight.
From a design/calc standpoint, are there any checks necessary to approve the short-slotted holes? My quick once-over of the code makes me think the fabricator's recommendation is OK. I'd like to approve the change as I know the short-slotted holes will help the erectors with fit-up.
Apologies as the Q may seem trite or simple but I'm an EIT with 2+ years of concrete design practice experience doing shops on my first steel design - just trying to save myself a bit of code-hunting.
2nd Q: Any other general shop drawing/CA/field inspection tips for a steel newbie?
From a design/calc standpoint, are there any checks necessary to approve the short-slotted holes? My quick once-over of the code makes me think the fabricator's recommendation is OK. I'd like to approve the change as I know the short-slotted holes will help the erectors with fit-up.
Apologies as the Q may seem trite or simple but I'm an EIT with 2+ years of concrete design practice experience doing shops on my first steel design - just trying to save myself a bit of code-hunting.
2nd Q: Any other general shop drawing/CA/field inspection tips for a steel newbie? 




RE: Fabricator substituting standard holes with short-slotted
RE: Fabricator substituting standard holes with short-slotted
To me that implies you are expecting some horizontal movement within the joint, and therefore slotted holes would be expected.
RE: Fabricator substituting standard holes with short-slotted
The short-slotted holes are necessary from the erector's perspective because we have a few bays of supported slab being expanded into a confined, existing space. Apparently all the long-slotted holes we included didn't keep them happy enough.
RE: Fabricator substituting standard holes with short-slotted
What is the connection material? Single plate (shear tab) connections?
AISC 13th Ed allows for single plates with up to 3 1/2" eccentricity, with no consideration of eccentricity on the bolts (straight shear). SEE 13th ED p10-101
This applies to a single column of bolts only. For multiple columns eccentricity must be considered. And slip-critical bolts must be used with short slots.
This also assumes that the connection is not to a concrete embed. Single plates are "rigid" connection, therefore the embed must consider the moment, rather than shear only.
RE: Fabricator substituting standard holes with short-slotted