Hello, everyone! I have obtained some Surface objects (in the form of thin-walled steel box beams) using Plane cutting Geometry, and I now want to obtain the free-torsional moment of inertia of these surfaces. I would like to ask if there are existing solutions? Or a way to get the midline of the Surface outline?
Thanks for any suggestions!
Calculation step：
The free torsional moment of inertia of open section and closed section can be calculated separately by the existing calculation theory. Therefore, for thin-wall steel box girder with U-rib and one-frame rib, the calculation of its torsional moment of inertia needs to identify the stiffener in the Surface and separate it from the main body, and then distinguish the opening and closing of the stiffener and the main body, and finally calculate these parts respectively and linearly superposition to obtain the torsional moment of the whole section.
Since not all people here are structural engineers, I suggest you show all the steps you would use to calculate that moment of inertia with the use of calculator only, and the people will probably give solutions with the use of simple code blocks in dynamo…
Waaaaaay to engineery still. The description here has to be like you were explaining it to a 10 year old. Terms like “stiffener” make no real sense without an engineer’s perspective, and even with some background I can’t manage to identify the parts by name in your sketch (where are the U-ribs? where are the one frame ribs? etc.). Terms like “linearly superposition” have as much meaning to most people on the forum as if I said “base64 decode the binary data json string using a soap converter”.
Post the work as if you did it by hand, outlining each step, and provide a sample dataset for people to work off of and you’ll have more success.
