Waffle Slab : Beam Deflection with / without offsets

Dear Colleagues,

I use STAAD.Pro CONNECT Edition - Version 21.03.00.146.

As usual practise, we model the beams / columns at their respective centre lines (meaning no offsets), however, when I tried to model a waffle slab i get varied result - displacements especially.

The displacement of beam without offset (beam offsetted to match the top of slab/plate) is twice that of the beams with offsets (beam projecting above and below the slab/plate) - screen shots and staad file attached.

Please advice, which option would be best suited - for Waffle slabs.

  waffle.std

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