Wrong volume of a curved beam with rotated cross-section

[vancikv]

I have a steel beam resting on the side laid out in an arc. To model it I create a structural framing instance, select an arc segment in a floor plan and set the cross-section rotation to 90 degrees. Upon creating a schedule for this beam I find out that the material volume is zero, for 270 degrees it's 3.44 m3. Correct value is 0.13 m3.

I have created a test file to examine the issue and am posting it here, too. I made 36 copies of the beam and set the cross-section rotation from 0 to 350 degrees in increments of 10. Turns out the volume is correct for exactly 0 and 180, zero inbetween and higher than real between 180 and 350. For reference I did the same with a straight beam, turns out the volume is correct for all examined rotations.

Can anyone explain?

[martijn_pater]

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@vancikv wrote:

I have a steel beam resting on the side laid out in an arc. 

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Why?

[vancikv]

Reinforcing beams in a sheet pile wall along a curved river bank. The cross-section rotation is determined by the anchoring angle.

[martijn_pater]

Well I think it might be something to create the beam as Adaptive Component instead... you can find some topics on it if you do a search for that, for curved beams ie. I think SF beam tries to rotate over its axis, which is probably what gives you this issue.

[martijn_pater]

See example.

[vancikv]

I have no idea what you mean by "rotate over its axis". Anyway, thanks for the family, I'll look at it when I get to Revit next year.