Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

RE: seaint Digest for 12 Dec 2006

[Subject Prev][Subject Next][Thread Prev][Thread Next]
Michael - 

The Deck properties must be sufficient for composite behavior.  This will be
tough for you for the following reasons:
1) Thickness of Slab must be at least 2.0 in (per I5.1-5)
2) Height of Studs must extend at least 1.5 in into slab above deck (per

If I were you, I might try a composite W8 (with camber to reduce dead load

Alternatively, there are a couple of companies that specialize in open web
composite steel joists.  This might be a good application for them.  I
believe their names were Vescom and Hambro.  I never worked on a project
with them, so I can't give you too much information.  But, from what I
remember, they were supposed to be more cost effective on jobs with unusual
structural depth restrictions.


Josh Plummer, SE

RISA Technologies
(949) 951-5815 (voice)
(949) 951-5848 (fax)

From: Michael Hemstad <mhemstad(--nospam--at)>
To: seaint(--nospam--at)
Subject: Light composite beams

I have a retrofit situation where I am limited in both headroom and weight.=
  I am adding an exterior terrace above an existing roof.  The headroom is=
 limited by our friends at the Historic Preservation office insisting on=
 the new construction (actually, the roof of the restaurant one bay behind=
 it) remaining below the sightline over the existing parapet as seen from=
 the street.  The load is limited by the capacity of the existing structure=
 to carry it.

I currently have light stringers (W10x17) spaced at 6 feet, carrying a 1=
 1/2 inch composite deck with 1 1/2 inch topping (3 inch total).  My=
 deflection under pavers and live load is about L/450.

Is this a reasonable solution?  There isn't a lot of room for studs; can I=
 get 2 1/2 long studs?  Alternatively, I could use a slightly heavier W8=
 with a 4 inch deck (1 1/2 + 2 1/2) and still make deflection work out. =
 This is slightly heavier and slightly more expensive, but I know the studs=
 will fit.

Any thoughts?

Mike Hemstad

Michael Hemstad, P.E.


Meyer, Borgman and Johnson, Inc.

12 South Sixth Street
Suite 810
Minneapolis, MN 55402
(612) 338-0713 (main)
(612) 604-3621 (direct)
(612) 337-5325 (fax)

******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at:
*   This email was sent to you via Structural Engineers 
*   Association of Southern California (SEAOSC) server. To 
*   subscribe (no fee) or UnSubscribe, please go to:
*   Questions to seaint-ad(--nospam--at) Remember, any email you 
*   send to the list is public domain and may be re-posted 
*   without your permission. Make sure you visit our web 
*   site at: 
******* ****** ****** ****** ******* ****** ****** ********