Crane Girder Concrete Connection Design Help

[StructuralEIT]

Hi,

I am working on designing a concrete connection for top running crane girder which is sitting on a concrete wall top throughout its length.

I am a little bit confused but needed some advice when it comes to anchoring it down to the wall.

This girder spans along the length of the wall (80') and sits on it . So, I split it into approx. 15 feet spans so I could tie it back to the adjacent columns. However , for anchoring it down to the concrete , I was thinking to use 1.5in epoxy grout pad and a bearing plate on top of grout pad and beam flange anchored down to the concrete through bearing plate.

Should I really be doing this or let the beam straight on wall as that won't introduce any strong axis bending. But in reality wall top won't be that straight. So what is the right approach for this ?

Thank you.

 

[FLCraneBuilder]

If I understand your description correctly. (which is hard with out a sketch)..
You are correct that top of concrete will not be level, therefore having intermittent joints make sense.
Dependent on the crane capacity and or wall configuration, I would also consider placing the asce rail directly on the wall too. Rail can span 2 to 3 ft depending on load

I assume you are using epoxy sent anchors along with leveling nuts & a bearing plate (to properly set elevation - assuming the wall is out of level)

 

[StructuralEIT]

Yes, I will be using epoxy grout with bearing plate on top and then anchor the flange down to plate.

But, this is gonna be costly now as bearing the beam on grout with introduce x axis bending as it won't be sitting all along on wall anymore. On top, its a heavy duty crane , so I wont be able to just anchor it down to concrete as beam will pivot about bearing plate and pryout anchors. see attached pic. Do you think this should work ?

Do you have any connection detail in mind that I can use ? I was looking at CISC design guide but those connections are for girders sitting on column ends but should work on concrete too but I think I will be overdoing by using those connection details with end stiffeners and rockers etc.