Bolt holes oversized 1/16" or 1/8" for galvanized members
Bolt holes oversized 1/16" or 1/8" for galvanized members
(OP)
When hot dip galvanizing is to be used, does the AISC allow 1/8" oversized holes or is it necessary to stick with 1/16" oversize? These particular connections are bearing designed but I am also interested in other connection designs are the same (friction, slip critical, etc).





RE: Bolt holes oversized 1/16" or 1/8" for galvanized members
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I have been called "A storehouse of worthless information" many times.
RE: Bolt holes oversized 1/16" or 1/8" for galvanized members
They recommend tapping the holes after galvanizing.
RE: Bolt holes oversized 1/16" or 1/8" for galvanized members
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I have been called "A storehouse of worthless information" many times.
RE: Bolt holes oversized 1/16" or 1/8" for galvanized members
For just a typical bearing bolt conditition the answer is that the 1/16" clearance per AISC is adequate even for galvanized parts - see: http://ww
RE: Bolt holes oversized 1/16" or 1/8" for galvanized members
Another question has come up - are slotted holes allowed for cross bracing of pipe rack type structures, as requested by our erector to make the job of erecting the steel go easier?
RE: Bolt holes oversized 1/16" or 1/8" for galvanized members
It has been my practice to use oversized holes for bracing with A325 SC bolts to allow the erector some adjustment in fitup.
RE: Bolt holes oversized 1/16" or 1/8" for galvanized members
RE: Bolt holes oversized 1/16" or 1/8" for galvanized members
RE: Bolt holes oversized 1/16" or 1/8" for galvanized members
I appreciate that fact but I'm not able to convince the powers that be to allow it since the AISC manual does not cover it. The section quoted on page 5-271 seems to be for slip-critical not bearing connections. In addition, queries on the AISC web site bring up specific Q&A that deem slots unacceptable.
RE: Bolt holes oversized 1/16" or 1/8" for galvanized members
Double Angle Connections: p10-9 to 10-10 - read paragraph on "shop and field practices" - "Alternately, short-slotted holes can also be used."
Single Angle Connections: p10-123 - "shop and field practices" - ..."play in the open holes or horizontal slots in the angle leg may be used to provide the necessary adjustment to compenssate for mill variation."
etc. etc. etc.
As long as the slot is not IN THE DIRECTION of the applied load then it is perfectly acceptable in a standard shear connection.
Also see Item no. 32 in the "57 tips for reducing connection costs" : http://ww
RE: Bolt holes oversized 1/16" or 1/8" for galvanized members
RE: Bolt holes oversized 1/16" or 1/8" for galvanized members
RE: Bolt holes oversized 1/16" or 1/8" for galvanized members