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calculate J parameter in for double IPE

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hadiENG201

hadiENG201

Civil/Environmental
Joined
Sep 2, 2021
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5
Location
DE
Hi
i want to calculate the J(cm4)(torsion constant) parameter for double IPE section , but i can't find any formula or method to calculate that . Can someone please help me to find articles or methods to calculate J for double IPE ?
 
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OK, but how are the plates connected? It's the difference between 2 x J of individual members or a composite J by creating a closed section?

 
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The plates are welded to flanges , J is for a closed section (2 IPE + 2plates),

can it be calculated by a formula??
 
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If its intermittent welding, add all the J's together. There is no closed section formed with intermittent welding.

If continuous welding you can approximate the J by simple formulas for J by taking top and bottom of a box being the width between webs and thickness of the flange plate, and webs of the box as the webs of the beams. This thread should give you some ideas
 
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If you want the 'true' answer, you'll have to resort to FEM analysis of the cross section. I talk about using the free python sectionproperties package for this here. Even if you don't know python it is fairly easy to get up and running with it.

 
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