Open Ended Columns on Roof
Open Ended Columns on Roof
(OP)
A building was designed for 3 storeys with concrete roof slab. What if the beams and slabs of the roofslab won't be put yet but the 3 meter columns already arise that is open ended (without any beam connections on top of it). Is there any bad effects for this?






RE: Open Ended Columns on Roof
In general this shouldn't pose a problem - in precast buildings the upper floors of columns are often free for several days before the floor gets set. But it depends on the specifics of your situation.
Brian C Potter, PE
http://simplesupports.wordpress.com
RE: Open Ended Columns on Roof
RE: Open Ended Columns on Roof
RE: Open Ended Columns on Roof
RE: Open Ended Columns on Roof
Spray with anti-rust paint?
But would the seismic resistance be better if beams would be added now to the columns or no difference if open ended at the 3rd level? Could adding beams now act like bracing? This is because longspan metal sheet may be used instead of roof slab one year or so from now.
RE: Open Ended Columns on Roof
RE: Open Ended Columns on Roof
If you would temporary put weak cement-sand in the 0.5 meter open bars, how many bags of sands and cement in your experience so you can easily just remove it a year or two later with just light hammering?
RE: Open Ended Columns on Roof
RE: Open Ended Columns on Roof
Why would anyone have to move out when shoring for any roof slab when the floor supporting it is open to the skies.
The reason nothing is put yet is because it is not yet certain if the top floor will be used at all and only months later would we know. Of course we don't pay taxes until building is finished.
Do you think putting beams across the tops of the open columns can make it resist lateral seismic movement better? Imagine a building with 2 floors with beams versus 3 floors with beams. Would the latter produce better bracing against lateral movement?
RE: Open Ended Columns on Roof
If the top floor becomes your roof slab, will you waterproof it as such? I assume it is flat, and concrete is not inherently watertight. The reason for my question about taxes is that on my first visit to Northern African and Southern European countries, I marvelled at the number of unfinished buildings, with column reinforcement projecting above the topmost storey. When I was told the reason, I was amazed.
No, I don't think the beams would help.
RE: Open Ended Columns on Roof