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ali07 (Structural) (OP)
14 Apr 09 9:20
Looking for typical detail for crane opening in reinforced concrete flat slab structure.
cap4000 (Civil/Environmental)
14 Apr 09 9:28
There is no such thing as a typical detail for crane opening. What are loads,locations, and slab thickness? New York has had some serious and deadly crane failures over the past 2 years.
RHTPE (Structural)
14 Apr 09 9:45

CAP4000 is correct - no such thing as a "typical" crane opening.  Certainly the edges of the opening have to be treated as a construction joint for the future fill-in slab.  The size of the opening has to allow for the movement of the crane's tower structure.  The surrounding floor has to be designed for the opening and be self-supporting until the fill-in can be done.  The surrounding structure may also need to be designed for any bracing loads imposed by the crane's tower structure.  If it's a climbing crane, all crane reactions will be imposed onto the structure - the structure must be designed for these reactions.

Perhaps the crane supplier/manufacturing can help you to evaluate.
kslee1000 (Civil/Environmental)
14 Apr 09 9:59
I guess he is asking for typical slab openning, which is mainly utilized for lifting. The crane (could be a jib) is somewhere above, or near by with its own support.  
Den32 (Structural)
14 Apr 09 10:27
Yes, be careful with 'typicals'.....

What size is the opening and what type of slab is it (one-way, post tensioned, thickness, etc.)?

Are they bracing the crane to the slab?

Typically want to leave a key for future slab infill, then add reinforcing around the opening (and diagonal reinforcing at corners) to 'carry' the concrete around the opening.

Even if you find a 'typical' make sure you check it works for your application.  
ali07 (Structural) (OP)
14 Apr 09 10:30
kslee right, looking just for slab opening infill detail, i belive there are so many ways to do it. Construction joint definately should be there, but there are options if you are resisting shear with rebars at construction joint location or with construciton joint/key.  
kslee1000 (Civil/Environmental)
14 Apr 09 10:39
Use embed tension couplers to ensure the continuity required for reinforcing. Key way would help in shear.
ali07 (Structural) (OP)
14 Apr 09 10:40
look to make workable for my situation definately, not applying without calculation, not want to propose something against practical solutions.

Den32: Mentioned it is flat slab.
I am proposing opening in middle strip area.
crane is not supposed to imply load to the structural slab.
RHTPE (Structural)
14 Apr 09 10:48

One clarifying question comes to mind - is this an opening to permit the passage of material from level-to-level OR is this an opening for a tower crane's tower?  If it is the latter, then depending upon the height involved, the crane's tower may need to be braced to the building.

ali07 (Structural) (OP)
14 Apr 09 11:52
that is opening required to remove the crane. it is only 2 storied mall with one basement. But in anyways crane is not intended to brace to structue, i checked with them regarding this.

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