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RE: Over or under?

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Syed,

It really doesn't make a difference so long as one understands which side is
in compression and which is in tension.  I've normally seen it above the
line since bending at midspan is usually refered to as a positive moment
(hence above the line) and bending at supports as negative moments.

-----Original Message-----
From: syed faiz ahmad [mailto:syedfaiz23(--nospam--at)hotmail.com]
Sent: Saturday, December 01, 2001 2:20 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Over or under?


Foy,

I have always seen the moment diagrams drawn below the beam, i.e. on the 
'compression side' of the beam.

But I fail to understand the problem here. What difference does it make any 
way?

Regards,

SYED FAIZ AHMAD; MENGG, MASCE
SENIOR STRUCTURAL ENGINEER
SAUDI OGER LTD
RIYADH, SAUDI ARABIA.



>From: "Foy, Warren" <Warren.Foy(--nospam--at)mhgrp.com>
>Reply-To: <seaint(--nospam--at)seaint.org>
>To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
>Subject: RE: Over or under?
>Date: Sat, 1 Dec 2001 11:10:52 -0500
>
>Positive bending is above the beam line.
>
>-----Original Message-----
>From: Jason Kilgore [mailto:jkilgore(--nospam--at)leok.com]
>Sent: Friday, November 30, 2001 6:35 PM
>To: seaint(--nospam--at)seaint.org
>Subject: Over or under?
>
>
>A guy in our office is writing a program for roof drop beam analysis and
>design.
>
>When we were allowed to review it and give comments, an immediate argument
>broke out about which side of a beam to draw a moment diagram on.
>Traditionally, a beam moment diagram is drawn on the compression side
>(positive moment up and negative moment down -- as shown in the AISC
>manuals, for a simple-span beam the moment line is over the beam line) and 
>a
>frame moment diagram is drawn on the tension side.
>
>The programmer drew the drop-beam system like a frame (positive down and
>negative up), because he says that's the way he's always done it.  I 
>believe
>we've talked him into adding an user option to select how it looks (either
>over or under the beam).
>
>But now I'm curious.  How many of you draw beam moment diagrams on the
>tension side and how many on the negative side?
>
>----
>Jason Kilgore
>Leigh & O'Kane, L.L.C.
>jkilgore(--nospam--at)leok.com
>(816) 444-3144
>
>
>
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