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soft story

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  7 defines soft story as the one where "stiffness" is less than 70% of story above. If stiffness is to be defined as I/L this would mean whenever we have a 16ft 1st floor, we have a weak story, even though all the walls and columns are continuing from the story above? This is frequently the case in multi-story concrete buildings I design. I never thought of 1st story as weak, unless I was missing a wall or something. 

I'm afraid I haven't been reading it right. Have I?

Syed A Masroor
Consulting Structural Engineer
Karachi, Pakistan

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