Using Joint-Agent component for expansion joint of mullion

Dear all,

I'm studying Karamba to calculate facade structures against wind load.

For the vertical structures, the mullions, it should be divided into two elements and there'll be an expansion joint when the span of mullion is too long to be a single extrusion.

I'm trying to make that condition in Karamba, using Joint-Agent component. Because I had a reference calculated with other software, I tried to make same results with that. Thus, I blocked x,y,z rotation on Joint-Agent component and it worked. The green dot in screenshot image file is the expansion joint. And the bending moment at the point is zero.

I'm happy with that result, but I want to hear your comments if there's something to be modified for the better calculation, or any other recommendations for that.

I'll wait for your reply. Thanks!

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screenshot.png, 80 KB

Replies to This Discussion

Permalink Reply by Karamba3D on July 30, 2015 at 2:13am

Dear Jamparc,

the lower element is supported vertically at both supports which might still lead to locked thermal strains. Did you test the structure with a temperature load?

Best,

Clemens

Permalink Reply by Jaeman PARK on July 31, 2015 at 2:43am

Dear Clemens

You're right. The lowest support should not be blocked on Tz. It takes only wind load, not dead load(Gravity load in Karamba).

I have questions. I tested the temperature load which can be the value of movement of expansion joint.

movement = alphaT of material * ΔT * length of some mullion

Please see my attached gh file and you can see the "length of some mullion". And I don't know how Karamba selects the element(beam, mullion..) to input the length.

1. What is the clue of the selected elements?

2. Is the total vertical movement '+-displacement'? (=Δdisplacement*2)

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