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Re: Over or under?

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Dear  Jason,

In India we normally draw bending moment diagram in tension side
of the member in simple beam as well as in moment frames and this
makes the visualization of behaviour of the member comparatively

B. K. Paul
TCE Consulting Engineers Limited.
Mumbai, India

From: "Jason Kilgore" <jkilgore(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: Over or under?

A guy in our office is writing a program for roof drop beam
analysis and

When we were allowed to review it and give comments, an immediate
broke out about which side of a beam to draw a moment diagram on.
Traditionally, a beam moment diagram is drawn on the compression
(positive moment up and negative moment down -- as shown in the
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.
(816) 444-3144

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