WALLAP existing RC slab modelling as a strut? (In-depth answers appreciated)

[JCKL]

Hi all, new to eng tips but hopefully I can get some good discussion and pointers here

Young aspiring geotech engineer here based in London working in the temporary works sector (currently 6 months), where my work regularly involves assess and design propping systems for basement walls etc. between demo stages and before the permanent works go up

I came across (quite an old) post that is relevant to pretty much most jobs I work on:

https://www.eng-tips.com/viewthread.cfm?qid=423238#post

I was wondering if anyone had any update (or have I missed an updated post) on the most suitable way to model the stiffness provided to an embedded wall by RC slabs in WALLAP?
Whenever I consider any slab providing lateral support to a basement wall I usually enter strut spacing, cross section, free length all as 1, with E as representative 100,000 kN/m^2, 0 pre-stress - however this might under/over estimate the loads I've been calculating transferred into my temporary steel props etc? Any responses would be greatly appreciated

 

[Retrograde]

This is what I usually do:

Spacing = 1m
Cross section = 1m x slab thickness
Free length = half the distance to the other side of the basement
E = modulus of elasticity of concrete (typically around 30GPa)
Pre-stress = 0

 

[JCKL]

@Retrograde

Thanks for the answer, I realised this after giving it some thought yesterday. Thanks for the confirmation!