Shear wall & Deep beams - Will you model as Pier or Spandrel

ETABS provides options to model shear walls and slabs as shells. This can be membrane or shell thin or shell thick. When you adopt shell thin, there is also an option to model as pier or spandrel.
Many civil engineering job aspirants practice ETABS and are confused on ETABS modelling aspects related to pier and spandrels. When to model a pier and when to model a spandrel.
This Video explains demonstrating all options of pier and spandrel modelling using ETABS.
If you have to perform shear wall design in ETABS, then you have to model a shear wall as shell thin and assign a pier label.
Same way to design a beam modelled as a shell like that in a coupler beam or a deep beam, it needs to be modelled as a spandrel and we have to assign the spandrel label.
The structural analysis will be same as long as these are modelled as shells. Spandrel and pier labelling will only affect the result interpretation of the forces from ETABS and its design in ETABS.
It will be easier to interpret the result in ETABS in a form suitable for manual design if we label wall as per and deep beams as spandrels.
The video also covers the below mentioned structural aspects on shell modelling.
When to model shear wall or any shell as a Wall.
When to assign a pier label and how to assign a pier label
When to model a beam as a spandrel or shell
How to assign a spandrel label
What is the difference between pier and spandrel.
What will happen if a beam is modelled as a slab and shell thin in elevation
The structural video explains all the structural behaviour of shell modelling and demonstrate the shell behaviour in an ETABS model
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