Difference between constraints?

[aadvi15]

Hello all, I'm new to sap and was wondering what constraints I would need for my floor system which consisted of one way slabs and beams. I am designing a 5 story building for my design class and not sure if I need diaphragm or body restraints? I was thinking of using a diaphragm constraint but would I constrain just the perimeter joints? Thanks

 

[kostast88]

Select the 4 joints in the perimeter of the slab and assign diaphragm.If however you are interested in modelling the slab (because you mentioned one-way) perhaps you should do this in etabs or safe,the other csi software which have additional tools for slabs.

 

[TLycan]

aadvi5,

Note, if you are designing steel structure, Diaphragm constraint eliminate axial forces in the slabs and beams; for concrete that might be O.K. for steel is not.