Steel beam to concrete pier attachment

[BAGW]

Hi,

I have a condition where steel girder attaches to concrete pier. The steel girder has a tremendous shear load, in the range of 600kips factored.

The steel girder is a W36 which spans into concrete pier which is 6'-0" x 4'-0" x 10'-0" LG.

I tried using a embed plate with studs for the connection, but as the shear is too high I cannot make it work. Shear breakout and prying is an issue. Is there another way to attaching the beam to pier?

Thanks

 

[dik]

It can be done... can you make it a bearing connection? If not, a cast in plate with headed studs and clip angles welded to it.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[SlideRuleEra]

Agree with Dik, make a bearing connection. Perhaps by creating a "pocket" in the concrete pier.

Earlier edition of the AISC Manual of Steel Constructions included details for framed beam connections. The attached scan (for reference) is from the sixth edition. This will give you an idea of what it takes for a suitable W36 framed beam connection.

 

[BAGW]

There is a building column on top of the pier with significant axial and moment loads. I don’t want to create a pocket in the pier for bearing type connection.

The cast in place plate with headed stud, I am not able to get the shear breakout to work

 

[SJBombero]

Did you investigate using a shear lug welded to the back of the plate?

 

[dik]

For a 600K load you might need a little more than a shear lug...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[SJBombero]

675 kip, 4 - 18"x6" deep lugs, 16" o.c., 5 ksi concrete Maybe not the best solution but its a start. The embed plate can always be lengthened to provide locations for the shear lugs.
Another option might be to bury a steel section within the column.

 

[structSU10]

is this an existing or new condition? If this is a new design are you able to drop the bottom of the column down so the new beam frames into the steel column so it's just a base plate anchorage condition?

If it is existing, can you add a new pier outside of the existing to create a bearing condition for the new beam? Or add a concrete corbel (may run into similar capacity issues).

 

[JLNJ]

What about the eccentricity on the pier? 600 kips at a 12” eccentricity is 600 ft-kips.

I have done something similar by extending the connection angles down the face of the pier, but not for 600 kips.

 

[Brad805]

It sounds like you need a pedestal or a significant corbel. If the beam is not governed by shear you could likely cut down the bearing if the arch does not want the corbel to be visible. Makes the 60k embed I am working on look like childs play. Good luck.

 

[kipfoot]

I think you need to lower the top of pier elevation so that the girder can frame into the steel column near its base.

 

[MIStructE_IRE]

That is an insane load! Can you just stick a steel post under the steel beam, beside the existing concrete column? The architect will just have to live with it!

 

[hetgen]

Check this publication by SCI.

4 x 5 array of 1" (Ø25mm) shear studs could work.

 

[BAGW]

Yeah, I think dropping the column is the most viable solution.

do you have an example for the embedded steel in concrete like you are suggesting

 

[SJBombero]

do you have an example for the embedded steel in concrete like you are suggesting

This is what I was thinking.