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346gnu13-Aquamarine
13-Aquamarine
August 9, 2015
Question

Beam shear and moment measures

  • August 9, 2015
  • 1 reply
  • 2430 views

Hi,

Can we create measures for P, Vy, Vz,, Mx, My, Mz?

It has always been possible to plot shear and moment graphs as follows, so the information is there. Vis results dialogue:

I want to determine the shear and moments at specific points (connections) and perform a sensitivity study to look for max/min therefore I need a measure for these quantities..

It is only possible to calculate stress measures for beams. I have to reverse engineer the information required. Not efficient with potential for error.

Moments and forces are more useful.

A partial work around where beams are constrained at one end using displacement constraints I can measure force and moment reactions.

Thanks

1 reply

M
mlindqvist1-Visitor
1-Visitor
August 10, 2015

Charles,

This is something I have been wanting to do aswell... I have not seen any efficient technique.

A possible workaround is to create an advanced spring (point-point) that has properties similart to the beam. To accomplish this I guess a separate analysis is required to find the spring properties that replicates the beam behaviour. On springs it is then possible to find moments/forces on the endpoints.

Another strategy is to replace a beam (or a part of a beam) with a solid or shell,and then create resultant measures. Not very efficient either....

/Mats L

3
346gnu13-AquamarineAuthor
13-Aquamarine
August 10, 2015

Morning Mats,

It's not just me then.

I was contemplating mechanism dynamics but we don't have flexible beams.

To develop the spring idea a bit further ...

What if the beams are connected by very stiff springs (so they do not contribute to deflections) where the springs are very short (so they do not to significantly affect geometry) ?

You wouldn't need to approximate stiffness then.

(it's still a lot more pre processing than I would want to do ... and a lot more measures)

Charles

M
mlindqvist1-Visitor
1-Visitor
August 10, 2015

Charles,

Yes, this sounds like a good strategy. I'm not sure if advanced springs can have zero length, but I guess it should be possible to give it a short, insignificant length.

/M

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