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# calculate J parameter in for double IPE

## calculate J parameter in for double IPE

(OP)
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 ?

### RE: calculate J parameter in for double IPE

How are they arranged and connected might help? Horizontally or vertically, welded, bolted, other?

### RE: calculate J parameter in for double IPE

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?

### RE: calculate J parameter in for double IPE

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

can it be calculated by a formula??

### RE: calculate J parameter in for double IPE

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 https://www.eng-tips.com/viewthread.cfm?qid=477340

### RE: calculate J parameter in for double IPE

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.

### RE: calculate J parameter in for double IPE

(OP)
Thanks a lot

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