One way and Two way slabs - When to model slab as membrane and when to model as shell thin

This structural tutorial is attending a structural doubt on one way slab and two way slab behavior. The yield line theory assumption of Ly/Lx is an approximate method for load distribution.For more accuracy,the stiffness of slab needs to be accounted by modelling a slab as a shell thin in ETABS and by modelling slabs as elements in staad pro. When to model a slab as membrane and when to model as shell thin is attended in this video

The points are summarised below
When is a slab one way
When is a RCC slab 2 way
What is yield line theory?
What is the limitation of yield line theory
Why is yieldline theory providing safe results
What are the better methods for slab analysis
#When to model slab as membrane and when to model it as shell thin.
What happend when there are only 2 supports for a slab
What you need to do when there is only 3 supports for a slab
What to do when there is a point load in a slab
How to treat cutout in a slab
How to distribute load when there is an irregular shaped slab.

The answer to most of these questions are same. You need to bring in interaction between slab and beams and let the stiffness play its role in load distribution than going by thumb rules like Ly/Lx or Long span/ short span

If you understand these basic concepts of slab and shell analysis then your structural design in software like ETABS will be more effective.

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