From: Roger Turk <73527.1356(--nospam--at)compuserve.com>
Date: Fri, 23 Apr 1999 12:06:38 -0400
I pulled out my Steel Deck Institute Diaphragm Design Manual and a copy of an
article (How to Fasten Steel Deck - Update and Review) from Modern Steel
Construction, Number 1, 1988, fell out of it.
According to the article, puddle welds, no washers, design weld strength,
(lbs) for 22 ga. steel is:
1/2" visible diameter 500 lbs
5/8" visible diameter 630 lbs
3/4" visible diameter 765 lbs
For No. 10 screw in sidelap: 270 lbs
For "Well Connected" button punched sidelap: 70 lbs
So, I would guess that you would say that button punching is *NOT* comparable
to No. 10 screws.
Hope this helps.
A. Roger Turk, P.E.(Structural)
Barry Welliver wrote:
. > I have specified a 22ga. steel deck with puddle
. > welds at supports and #10 TEK screws at side laps.
. > The field has "supplied" a punched (button?) hole
. > at the side laps. My questions are:
. > 1. Is this crimped button hole comparable to
. > the TEK screws for side lap shear transfer?
. > 2. If so, is there available information
. > regarding substitution?
. > 3. Is this method (punched hole) considered a
. > stitch fastener?
. > Comments appreciated.
. > Barry H. Welliver