Add slabs on ETABS

[Angga S]

As same on subject "add slabs on ETABS", i make two model with same geometry 9m x 9m with column each 4.5m one story, the different is i add slab full one panel 9m x 9m and 4.5m x 4.5m (4 panels )for second's model. The result is moment almost double for second's model. Which one is correct. need Help and Advice

 

[wannabeSE]

It should be easy to do some hand calculations to verify the results. The results by hand may not be an exact match, but should be fairly close to the correct model.

 

[saadpervez1]

ETABS uses Finite Element Analysis for calculations, this means that the slab needs to be meshed into smaller parts to get better results, finer the mesh, better the results. CSI recommends that Mesh size should be decreased through a series of analysis iterations until two subsequent sets of results are similar, or until the balance between accuracy and analysis time are acceptable according to engineering criteria. The difference in your results means that you need to make even smaller panels.