Hello,
I have placed rigid links in my model. I have W10x33 beams resting on top of W24 girder beams. The W10's are bolted to the top flange of the W24's. I placed a rigid link between the nodes for the bolt. When I run the calculation for just dead load, I have instabilities in the nodes on the W10's for the rigid link. Iam not sure what I am doing wrong. I have attached my model and a screenshot. Any help would be greatly appreciated.
Set Bolt rigid link like this
M. Agayr
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In your model, you set bolt as below
Which means that your bolts don't block anything (Ux Uy an Uz are free)
In my bolt setup, to ux uy uz, i added rx to avoid instability. Bolt rx corresponds to the strong W 24x104 inertia (UY)
What does a Welded rigid link look like?
As below
M. Agayr
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Sorry about the typo.
Correct, its Iy
M. Agayr
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Below a workaround, but maybe there is a quicker solution.
Select all W10 33 members, then look at fz diagram to calculate reaction at these nodes.You may then design your bolts under these reactions.
To be conservative you can select all W 10 33 members and take design reaction as max Fz + Min Fz
M. Agayr
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Message 8 updated (you don't need to split W10 33 members)
M. Agayr
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Hi @Simau
your attached picture:
there seems to exist 4 bolts, two on each side, correct?
In the model, there exists only one rigid link at this place, isn't it?
How one can use (one) rigid link results to design these (4) bolts?
Yes there are 4 bolts (but its only an example). A bolt is designed with Reaction/4
You may use the classic scheme:
M. Agayr
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Please complete your model with loads you need and create combiations. If you apply wind loads to claddings, efforts will be mostly parallel to local axis Z of the purlins.
Look at "reactions" in local axis x y z , you will find that the efforts in the x and y directions are negligible.
M. Agayr
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Hi @Simau
ignore lateral load, assume gravity load as follow:
Can rigid link simulate this condition?
Yes, just add Rz as blocked direction in bolt parameters
M. Agayr
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It's not possible.
The rigid link will give you the the whole torsional moment , but not the sharing of this moment between the bolts. You have to calculate the distribution manually.
You may try a small model simulating this connection (see model attached)
M. Agayr
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Very sorry, but old versions are no longer installed here.
M. Agayr
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here is what I modeled.
A steel plate on 6 supports subjected to a torsion moment of 100 kNm
M. Agayr
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