FE core wall / floor slab junction

[hockley]

I'm in the process of modelling a multi-storey building with RC floor slabs and core walls. I'm wondering whether, from the point of view of the design of the reinforcement in the walls, it is unconservative to have a 'hinge' (preventing the transfer of moment from the slab into the walls) in my model at the junction of the slab and walls?

I'd be interested to know how others model this situation - I realise that some moment will in reality be transfered from the slab to the walls - but I suspect that for a 380mm slab and 200mm wall its not going to be as much as my model is predicting (in which everything is continuous).

Any wisdom on this gratefully received.

 

[MSDw]

One of my good colleagues used to consider the wall resisting a part of the Fixed end moment (Fem)from the beam(or slab) equal to:
Fem*{1-(Islab/Iwall)} ..and never allowed for Islab to be greater then Iwall.

This is a mere kind of interpolation between zero case (hinge) or full fixity case.

Best approach is to use a FEA, with rotational springs at the slab edges with stiffness equal to EI/L^3 of the wall . Or even better, use a mesh element for the wall.