Inter-Storey Drift for Base Isolated R.C. Frame Buildings

This article presents the development of a relationship between the design and the achieved inter-story drift ratio for base isolated R.C. frame buildings with lead rubber bearings. The developed relation is based on the storey drift responses from inelastic time history analysis of the base isolated R.C. frame buildings. Buildings of four, six and nine storey heights and three different layouts are considered. The Direct Displacement Based Design approach is used to design the buildings. The design inter-storey drift ratio ranges from 0.1 to 2.5%. Five EC-8 spectrum-compatible ground motions of 0.48 times acceleration due to gravity, and medium type soil are considered for the inelastic time history analyses. The proposed relation is validated with new buildings of different plans and heights. The validations results are in tune with the target inter storey drift with accuracy ranging from 96 to 98%.