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Re: Over or under?

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The Classical style has always been on the compression side as you said,
however when working with concrete design tension side is preferable as a
quick visual check for steel placement. Additionally, drawing on the tension
side more closely approximates the deflected shape.   I must confess to
using both methods depending on the material, but tend to lean towards the
tension side.  Allot of computer programs adopt the tension side as a
default.  I think you will find a fairly equal split of opinion.  Similar to
the LRFD ASD debate.  There really is no "correct" answer.

Paul Feather
----- Original Message -----
From: "Jason Kilgore" <jkilgore(--nospam--at)leok.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Friday, November 30, 2001 3:35 PM
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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