EFFECTS OF DRIFT IN SOFT STORIED RCC BUILDINGS

As per Indian I.S.-1893-2002 code storey drift limitations states that it should not more than 0.004 times the storey height as per the clause 7.11.1, 7.11.2 and 7.11.3. Whereas per ASCE-7.02 also states that structure up to four storey, storey drift can vary 0.015H to 0.025H {H-Total height of building}. For a moment resistant frame building should have maximum storey drift of the order of 0.75% of storey height. NBCC-1995 requires that maximum interstorey drift be limited to 1% of storey height for post disaster building and 2% for all other buildings. As per Peru (NCC-1977) code states that for RCC building storey drift can be 0.7% of storey height. As recommended by many researchers a total collapse mechanism design is desirable to control drift demand so primary factor governing first storey drift demand is the first storey strength itself.