Forums >> Revit Structure >> Technical Support >> setback structure

jimshunk

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Joined: Tue, Aug 28, 2012
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hi.

this is my first thread on revit city, and i apologise in advance if this is not the right place for my thread.

i am in my final year studying architectural technology and i have designed a 5 storey building and each floor

is set back 1 metre from the one below it. the structure will be made with steel beams and columns, with

concrete slabs poured in each bay.

my question is can this be done, which i presume it can, but as i am not an engineer, i am unable to say how it works.

i have a small understanding on point loads and forces acting on a beam.

anyway, as i said, each floor has a concrete slab. this has to be supported by a column, but with my design, the column is just resting on the beam below, and then it steps out aginb for the next load.

i have attached a 2D drawing of what the structure will look like, so i hope you can understand what i mean.

as i said, i am an architecture student, and this isnt really an issue to work out loads, but as i design a building i like to

have an idea of how the structure works.

i can use revit and position beamsn and columns and all looks weel in 3D, but will it actually work??

will it need very thick beams?

sorry for the long post, and i know it is a bit away from an actual revit question, but thought someone here could

ease my mind.

thanks in advance,

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WWHub

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Probably not as you show it.  The reason why it won't work is that 1/2 the floor loads from every level ends up resting on the first level's beam.    You can do something like this on one level but the exterior column on the next should be continuous all the way down.  Depending on your skin, that cloumn might axtually be at the location of your fouth floor column and the 4th floor cantelevers out to the position you want for the 3rd floor.  << No 3rd floor perimeter columns.

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jimshunk

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thanks for your reply.

i understand what u mean, and it did cross my mind that it would be too much of a load.

i have attached another drawing.

do you think this would help?

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WWHub

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Not much... Do the next floor down ....not the top floor.

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jimshunk

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so this will be sufficient?

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WWHub

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That has a better chance of working.

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jimshunk

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thanks for your help. i can see now myself that it would have a better chance of working.

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Manny

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It does work, all you have to do is make your bearing beams bigger as you go higher. 

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jimshunk

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Thanks for your reply. So are u saying that more or less all those 3. Structure would work? after more research myself, I have

Found out that I could use a slanted concrete column structure?  Then the cantilever would be the same on each floor. Would I be right in saying that?

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