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to calculate story stiffness without etabs...then calculate manually the stiffness and displacement of all the elments to calculate story strength use response plots of shear force in display menu

This is a secret in etabs....good question....export your story displacements and story shears in excel and use the relationship to find out story stiffness

bearing walls means ...wall carrying load in axial direction ....masonry or concrete doesnt matter....if there is a wall carrying vertical load its a bearing wall... like shear wall carries shear....bearing wall carries load too... what will you if a wall carries both shear and vertical load?

thanx Rana,what about storey strength ?and what if one need to calculate storey stiffness without etabs.

Some engineers may have used this term, but it not a 'standarad term' to describe particular type of structure. Infact, I have only read the term 'bearing wall', which is used for masonry construction; the term is used to differentiate between walls that are part of load transfer mechanism and the walls that are needed for architectural reasons. Every structure has to bear loads. How can a structure stand if it can't bear loads?

there are many reasons for these errors..you should not let it happen for example extrude your model and check if your geometry is okay...some times...1000m is put instead of 1000mm in section properties making very stiff elements with flexible check if out of plane modifiers are applied to membrane check if base is properly restrained...some times like in springs..vertical restraint is provided but not horizontal if your struc is 2d make sure to analyze it in 2d not in 3d in analyze>analysis options menu check if vertical elements are not accidently deleted in mid stories distrubing the load path check if very thin shells are modelled... and so on

its a chapter from a book about pile design. Good read. design-of-piled-foundation.pdf

ur always talking abt tutorials and when im making them and sharing here in tutorials sections...your are not following ..but my tutorials are only for etabs!