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Re: FEMA 350 & Composite Steel Beams
- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: FEMA 350 & Composite Steel Beams
- From: "Javier Encinas" <jencinas(--nospam--at)coqui.net>
- Date: Thu, 24 Feb 2005 10:04:40 -0400
Yes, you may design the member as a composite beam,
but omit the shear studs on the area between the plastic hinge and the
column face. Don't forget to check the member capacity (non-composite) at the
----- Original Message -----
Sent: Wednesday, February 23, 2005 11:40
Subject: FEMA 350 & Composite Steel
I have a two framed floor steel
structure above a partial basement level essential facility in seismic design
category D. The floor system will be 3.25 inches of 115 pcf light-weight
concrete topping on a 3” composite steel deck for a total slab thickness of
6.25 inches. The proposed lateral force resisting system will be special steel
moment frames with a reduced beam section type of pre-qualified connection.
FEMA 350 explicitly forbids the use of welded shear studs on the moment frame
beams between the column face and the plastic hinge.
Are others designing the moment
frame beams as a “bare beam” without any shear studs on the entire member? Or,
are you placing shear studs on the member, but only away from the plastic
hinge location? Please note that my question refers to the frame beams only,
as non-moment-frame beams will be simply supported ordinary composite steel
Jonathan D. Smith, P.E.,
Engineering & Inspection
Travelers Rest, SC 29690
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