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Re: Joists-girders-beams[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Joists-girders-beams
- From: "Ddumba Nathan" <ddumba(--nospam--at)engineer.com>
- Date: Sun, 07 May 2006 21:23:14 -0500
A little late but I guess the issue is still hot so i'll drag on with this a little more.
- 'ceiling and timber decking' definitions normally stick to joists,
- roofing definitions normally stick to purlins, tie-beams etc
- concrete structures stick to (concrete)beams,
- bridge structures sometimes include (concrete)box-girders, headstocks etc.
- steel structures stick to Girders and Steel I-beams/T-beams.
Otherwise, on a serious note, a structural engineer still designs a [joist, underpurlin, girder] as a structural member spanning horizontally carrying load over it and transfering it to support(s)...which in simple terms is a 'beam' designed according to those simple beam theories (free body diagrams, sum of forces/reactions...).
Thus why aren't they [joist, underpurlin, girder] all simply 'types of beams'?
Subject: RE: SEMANTICS: Def. of "Joist" vs. "Beam"
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supporting members that run from wall to wall, wall to beam or beam
to beam, to support a ceiling, roof (or floor). It may be made of
wood, steel or concrete. Typically a beam is bigger than a joist and
thus is distinguished from a joist. Joists will often be supported by
beams. Joists support the sub-floor (floor deck) directly.
They often have an I beam cross section for strength. Girder is the
term used to denote the main horizontal support of a structure.
Plywood (or decking wood or metal) load joists
Joists load purlins
Purlins load beams
Beams load girders
Girders to columns
still open for change.
Shephard - Wesnitzer, Inc.
Civil Engineering and Surveying
P.O. Box 3924
Sedona, AZ 86340
PHONE (928) 282-1061
FAX (928) 282-2058
From: Polhemus, Bill [mailto:BPolhemus(--nospam--at)wje.com]
Sent: Monday, May 01, 2006 4:07 PM
Subject: SEMANTICS: Def. of "Joist" vs. "Beam"
from a "beam"? I say that what I'm looking at are "joists": They are
flexural members that directly accept the service loads, are laid
parallel to one another and are closely spaced.
Wiss, Janney, Elstner Associates, Inc.
Engineers I Architects I Material Scientists
10235 West Little York, Suite 245
Houston, Texas 77040
P: 832-467-2177 F: 832-467-2178
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