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SAP Sign Convention

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CWEngineer

Civil/Environmental
Jul 3, 2002
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I am trying to get clarification regarding the sign convention in SAP, in particular for the moment diagram. My understanding is that SAP shows the moment diagram on the tension side of a beam. Also positive moment is when there is compression in the Axis 2 side of the beam.

In the attached document, the moment diagram for the horizontal simply supported beam is shown consistently below the beam on page 2 and page 4. Which makes sense to me.

For the vertical simply supported beam, it is shown on the left on page 7 (I agree with this). But I do not understand why it is shown on the bottom on page 9? The I-End, is the left of the beam (bottom). I would think the moment diagram should be above the axis, similar to that of page 7.

Appreciate if you can help me clarify this.

Thanks
 
 https://files.engineering.com/getfile.aspx?folder=850c2fe8-487a-4e4f-9d0e-255cf69a229e&file=SAP_-_Sign_Convention_(05312018).pdf
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