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RE: Steel Deck Diaphragms -Reply

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The ICBO Evaluation Reports for steel decks show Allowable Diaphragm
Shear Values using button punched sidelaps.

As another source of information contact the Center for Cold-Formed
Steel Structures:

>>> "Roger Davis" <rdavis(--nospam--at)> 04/23/99 08:49am >>>
The Steel Deck Institute Diaphragm Design Manual says "Button punched
sidelaps do stabalize panel edges but, otherwise may contribute little to
diaphragm strength.  They can vary greatly in shape and effectiveness.
The quality of button punching is difficult to maintain; the attachment
depends on the care and the energy used by the installer and the tool that
is used.  A conservative approach for using the tables in Appendix V for
diaphragms with button punched sidelaps is to consider the button
punches as
having zero strength and then use the first line in each table."

Roger Davis
SDS Architects, Inc
205 N. Dewey Street
Eau Claire, WI 54703

-----Original Message-----
From:	Barry H. Welliver [mailto:wellive(--nospam--at)]
Sent:	Friday, April 23, 1999 10:11 AM
To:	seaint(--nospam--at)
Subject:	Steel Deck Diaphragms

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