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Interpreting Analysis Results - UPDATE

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The good folks at Research Engineers have guided me to the section of their technical reference which describes how STAAD.Pro interprets Mxy, p. 3-32.

 

The user has an option to either ignore Mxy or to use the Wood-Armer equations.

 

For the top reinforcing, the following quantities are calculated:

 

Mx1=Mx+abs(Mxy)

My1=My+abs(Mxy)

Mx2=Mx+abs(Mxy^2/My)

My2=My+abs(Mxy^2./Mx)

 

If both Mx1 and My1 are positive, Mxd=Mx1 and Myd=My1.

If both Mx1 and My1 are negative, Mxd=0 and Myd=0.

If Mx1 is negative and My1 is positive, Mxd=0 and Myd=My2.

If My1 is negative and Mx1 is positive, Mxd=Mx2 and Myd=0.

 

For the bottom reinforcement:

 

Mx1=Mx-abs(Mxy)

My1=My-abs(Mxy)

Mx2=Mx-abs(Mxy^2/My)

My2=My-abs((Mxy2/Mx)

 

If both Mx1 and My1 are positive, Mxd=0 and Myd=0.

If both Mx1 and My1 are negative, Mxd=Mx1 and Myd=My1.

If Mx1 is negative and My1 is positive, Mxd=Mx2 and Myd=0.

If My1 is negative and Mx1 is positive, Mxd=0 and Myd=My2.

 

Mxd and Myd are then used in lieu of Mx and My for calculations of the required reinforcing.

 

Regards,

 

T. William (Bill) Allen, S.E. (CA #2607)

ALLEN DESIGNS

Consulting Structural Engineers

http://www.AllenDesigns.com

V (949) 248-8588

F (949) 209-2509