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Re: SEMANTICS: Def. of "Joist" vs. "Beam"

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No, it is a rafter:-)

The entire thing is irrelevant. In wood the system is referred to as joists and beams, steel the system is typically beams and girders.

In concrete, joist actually has specific definition, a joist slab system is defined in the ACI, otherwise it would be beams and girders.

Personally I like the spanning thingy definition.


Paul Feather PE, SE
www.SE-Solutions.net
pfeather(--nospam--at)SE-Solutions.net
----- Original Message ----- From: "Joe Grill" <jgrill(--nospam--at)swiaz.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Tuesday, May 02, 2006 7:42 AM
Subject: RE: SEMANTICS: Def. of "Joist" vs. "Beam"


So a roof joist on a pitch isn't a "joist" but a beam?

Joseph R. Grill, P.E. (Structural)
Shephard - Wesnitzer, Inc.
Civil Engineering and Surveying
P.O. Box 3924
Sedona, AZ  86340
PHONE (928) 282-1061
FAX (928) 282-2058
jgrill(--nospam--at)swiaz.com



-----Original Message-----
From: Paul Ransom [mailto:ad026(--nospam--at)hwcn.org]
Sent: Tuesday, May 02, 2006 6:50 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: SEMANTICS: Def. of "Joist" vs. "Beam"

From: "Polhemus, Bill" <BPolhemus(--nospam--at)wje.com>

What is the definition of a "joist" (generically speaking) as distinct
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.

He says they are "beams."  But maybe I'm putting too fine a point on it.

What say you?

A joist is a beam in a particular application.

In code parlance, if words are not explicitly defined, they revert to
common (mis-)use interpretation. Its just common sense, right? :)

I believe that your definition of a joist should include the words
horizontal, floor or roof and they typically receive the load through a
cladding, sheathing or overlay. Not directly.

If it's not horizontal, it might be a stud.

My Concise English Dictionary says:
One of a series of parallel horizontal timbers to which floor-boards or
the laths of a ceiling are nailed. (This needs some serious up-dating)

Can you and your colleague agree on a different term, like, "spanning
thingy supporting stuff," or, "anti-gravity mechanism?"

Regards
Paul

--
R. Paul Ransom, P. Eng.
Civil/Structural/Project/International
Burlington, Ontario, Canada
<mailto:ado26(--nospam--at)hwcn.org> <http://www.hwcn.org/~ad026/civil.html>

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