Notched Steel Beam Seat Design

[Steve73MGB]

Hi Everyone,

I am looking for a notched wide flange beam seat at a steel girder design example. The beam seat depth must match the steel joist seat and a slotted steel plate is welded to the web to from the seat. Does anyone have a reference or example of this?

Thank you,

Steve

 

[connectegr]

Steve,
Sorry I can't picture your condition. Can you provide a sketch?

http://www.FerrellEngineering.com

 

[ToadJones]

what I am picturing is a beam notched to sit at the same top-of-steel elevation as a open web joist?

If so connections like this have been discussed on here previously...you might try a search.

However, the design is rather straight forward. You'll need to check the shear capacity of the notched beam and any other limit state applicable, such as web crippling etc. found in Chapter J.10 of the AISC Specification. The seat plate may involve the calculation of the shear flow in order to design the seat plate-to-web weld.

For that, I know there was a posting about shear flow on this site that may have been the longest running posting of any forum in the history of the internet.

 

[connectegr]

I rarely see beam to girder connections using seats. If the TOS elevation is the concern, simply cope the beam and provide a bolted shear connection to the girder web, shear plate, clip angles, etc. The beam must be checked for for bending and shear through the coped section. If the cope is excessive. You might use and extended shear plate, so the connection is outside the girder flanges.

http://www.FerrellEngineering.com

 

[ToadJones]

ConnectErg-
Imagine a Girder with a joist with a seat framing in from one side and a beam framing into the other (joist and beam 90º to the girder).
I think this is what the OP was talking about,...am I right?

I have notched and seated beams like this before when something was resting on top of the beam and a gap was not desirable.
I have also used many extended shear tab connections as you proposed.
My guess is, since the joist seat is "OK" making a seated connection out of a wideflange should easy to do.
I have also used "seat" angles welded to the web of a wideflange to accomplish this type of connection.

 

[ToadJones]

...like this

 

[connectegr]

ToadJones
I have seen and used the detail you provided. Thanks for the additional info.

http://www.FerrellEngineering.com

 

[SteelPE]

The best design example I have seen regarding the ToadJones connection can be found in a book titled "Designing With Steel Joists, Joist Girders, Steel Deck" by James Fisher. He goes through a step by step process for checking the design.

I have use the detail a few times when designing buildings that utilize OWSJ.

 

[BAretired]

If the joist shoe is shallow and the beam reaction is not too high, the attached detail works quite well.

BA