try one of these:yorik wrote:...
A little question that annoys me, the pybar files needs the quadratic moments from the sections of the structural members. Calculating that is not hard for rectangular sections, but we should have something that works for any kind of section. Anyone of you engineering gurus has an idea on the subject?
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import Part box = Part.makeBox(1,10,5) Part.show(box) box.StaticMoments box.MatrixOfInertia
haha it would have been so easy.box.MatrixOfInertia
this should be the z value in the 3. row in MatrixOfInertia. Also the polar Moment could be calculated with the same method I have posted before, using gauss to reduce the area integral to the boundary. But as r^2 = x^2 +y^2 the polar Moment becomes simple the sum of Ix + Iy. https://en.wikipedia.org/wiki/Second_mo ... is_theoremHi, I'm a bit rusty at this, but the real difficulty is to determine the torsional moment of inertia for non simple sections.
I see, this task is a bit more difficultI was referring to this: http://mathworld.wolfram.com/TorsionalRigidity.html
You are right, maybe the calculix heat-equation could be (ab)used for this task.Maybe the FEM module could be used to numerically evaluate it.
yorik wrote:After a long time, some updates on this subject!
That would sure be needed!yorik wrote:... I'm trying to convince him to make pybar translatable...
Would be very useful for Beam FEM in FemModul as well.yorik wrote:... I'm planning to:
- Add a couple of tools to edit the structural nodes of the Arch structures, so one can make them meet
Definition of constraints of the structural elements to each other (joints) and the constraints of the structure (supports) is needed too. All this could be used later in Fem too (Fem Constraints could be generated out of the Definitions in Arch). But as you wrote all this is another story only worth to go if first steps are sucessful.yorik wrote: After that we could look at how we could define loads on the Arch structures (that could be used in FEM too), but that's another story...
How about the face axis? They would be very useful for Shell FEM in FemModule as well.yorik wrote:Yes, we could upgrade the system... It could even be pretty simple, use the same Nodes property, since we only need 2 vectors to define a plane. Then, depending on the role of the element, we show a line/polyline or a plane.
Yes, easily, I could add a method for that, but basically it would be just this:bernd wrote: To mesh the structure gmsh needs a shape which will be exported to step. See viewtopic.php?f=22&t=11182#p92187 Is there any possibility to get a shape (edges) out of the structural ArchAxis?
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