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modeling a ribbed floor

modeling a ribbed floor

modeling a ribbed floor

(OP)
Sorry, I posted this in another group . I'm new and I made a mistake. Perhaps this is the right place to post it.I beg pardon.

I'm trying to model a reinforced ribbed floor concrete and I've found the thread801-171434: Modelling Slabs and beams in SAP2000: Modelling Slabs and beams in SAP2000 very useful but I haven't understood when Stressed says "frames offset from the slab and connect them using joint constraints," . Which kind of constraints ? When we link the slab and the frames in the same node aren't they already constrained with "continuity" I would mean "congruence"?
I hope Stressed or whoever will help me clarifying it.

Furthermore, if I join the slab and the rib as beam in the midplane , I mean after I've calculated the real moment of inertia of the T-beam so the rib-beam plus the slab in their midplane have the same moment of inertia, what kind of physical entity would I lose?
Thank you very much in advance for your help.
Aliante

RE: modeling a ribbed floor

(OP)
Hi Mikyamero,
I've visited the site you adviced, but I haven't found the answer to my question or perhaps I haven't understood your suggestion. Please, could you explain more clearly.
Best regards,
Aliante

RE: modeling a ribbed floor

you can experiment with Assign>Frame>Insertion point by reviewing the difference in results between the default centroid and 8 Top center. By making insertion point assignments (aka cardinal points), SAP will automatically create internal constraints based on section and type of insertion point which will affect calculated moments.

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