How should I consider plate thickness for this connection

[Phatt]

Hi,

I want to install a new SQ tube beam under an existing beam by bolt connection. (Beam to plate connection is weld connection.)
How should I determine the new plate thickness? Is considering plate tearing out from bolt enough?
I am quite concern about the moment force on the plate. How should I design it?


Thank you,

 

[SWComposites]

what moment? there are no loads provided on the sketch.
can you show a cross-section view?
what is currently connected to the "existing plate"?

 

[bigester93]

check against rupture

 

[JoelTXCive]

I think you need a cross section too.

The plate bending is seems straightforward. See section F11 of the steel manual M_p=F_y * Z

 

[phamENG]

This could be simple, or it could be complex. If it's just hanging there with tension loads, you'll need to check prying in the plates. If there's shear, you'll have all of the typical checks for a bolted shear connection for both the bolts and the plate. Etc.

You have essentially zero details, so it's not possible to give you good guidance other than the need to discuss this with a senior engineer in your office.

 

[dylansdad]

How do you plan to install the bolts?

 

[dylansdad]

Upon further review, I guess the bolts would be outboard of the tubes. A section view would be great.

 

[Phatt]

It has some equipment hang under the new beam(show as round pipe in the picture). So it has bending moment around X and Z axis due to Wind load.

My question may sound stupid but I'm quite confused now.
Is it OK? if I just check the bending moment capacity around X axis on the plate like this.
If this is not correct, could you please suggest.

thank you everyone!

 

[HTURKAK]

I saw this thread yesterday . With latest post of the OP , now i am more confused ..

Some questions ;

- Are the round pipes in the picture new equipment hang under the new beam ? And gravity direction is Y ?

- Are there three connections ?

- What about the supports of existing beam , and spans ?

Apparently the loads at Y direction and the primary moment would be Mz .



No!! not really...

Still the best approach could be the assumption of combined beam and calculate the shear values at plate joints for gravity load case..
It would be better to provide more details ..














I cannot give you the formula for success, but I can give you the formula for failure..It is: Try to please everybody.

 

[Phatt]

I saw this thread yesterday . With latest post of the OP , now i am more confused ..

Some questions ;

- Are the round pipes in the picture new equipment hang under the new beam ? And gravity direction is Y ?
Yes
- Are there three connections ?
Yes
- What about the supports of existing beam , and spans ?
The existing beam looks similar the structure in the link below.(I want to show the real photos but I am not sure that I can do it)
The owners just want me to design the new beam to increase the spacing between equipment and they assumed that the existing structure is adequate.

https://www.alamy.com/stock-photo-h...ower-plant-substation-livermore-13573030.html

Apparently the loads at Y direction and the primary moment would be Mz .

No!! not really...

Still the best approach could be the assumption of combined beam and calculate the shear values at plate joints for gravity load case..
It would be better to provide more details ..

Here is a detail how the plate is connected to the square beam.

Thank you for every comment!