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Wing plate detailed design - hand calculations 1

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Ashenbrenner

Ashenbrenner

Structural
Jun 8, 2020
2
NL
Good afternoon engineers!

I am struggling with understanding the concept of the hand calculations for the case shown in the attachments.
In short, there is a structure which is located on sea transport. Each column of this structure has a welded to it endplate which is locked to the grillage system via the wingplates. Wingplates are welded to the transport beams (marked in red). There is an uplift force applied in the centre of each column.

My question is, what kind of approach would you use for the hand calculations, to define the thickness and dimensions of the wingplate and the weld size per plate (how to calculate stresses and deformation in the plate). In total there supposed to be 4 wingplates - 2 on each side.

Thanks in advance!
 
 https://files.engineering.com/getfile.aspx?folder=76fe3b6a-d334-4891-82e0-1fb6975da995&file=wing_plate.jpg
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How many wing plates are attached to each end plate? You are showing one but I am guessing there would be more.

Also, on your drawing, perpendicular to your wind plat you are showing what appears to be an arrow that is perpendicular to the wing plate (perpendicular to the red line), what does that arrow stand for? a force?
 
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Apologies for the confusion.

In total it is assumed to have 4 wingplates. With the horizontal arrow I referred that there is an additional wingplate on this side.
There is only one uplift force which is applied in the centre of the column.
 
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This appears to be a simple bending problem. Figure out how the Fup force makes its way to the wing plate and then design the wind plate to distribute the load to the red highlighted weld (Moment = Load per wing plate x eccentricity). The plate and the weld to the supporting structure will need to resist the moment and the shear generated.

Are there any other wing plates applied to the other side of the column (the side opposite of the arrow in question)? I would hope so, but if not, then the problem become a little more difficult, but is still possible.
 
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1/4 of Fup on each brkt.

design the brkt and welds (in tension) for this load

end-pad bending … Fup*L/8

welds on baseplate to take Fup (obviously)

another day in paradise, or is paradise one day closer ?
 
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Analyze force diagram below (ΣM[sub]A[/sub]=0). Black - applied load; Read - resultant forces.

u_epzjyg.png
 
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whilst I took that for granted, the sketch raises a question in my mind …
how good is the bearing contact between the end pad and the wing plate ? would it be welded ?

another day in paradise, or is paradise one day closer ?
 
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