Inelastic Earthquake Responses of Multi-storey Buildings

The influence of column stiffness, damping and foundation interaction on the earthquake response of multi-storey shear buildings is analysed. Using Ramberg-Osgood and bilinear formulations, the moment-curvature and shear-deflexion relationships for the columns are computed, based on the general nonlinear inelastic stress-strain relationships which include the hysteretic loops and strain hardening range. It is found that damping can sometimes prevent buildings from going into inelastic deformation. The decrease in column stiffness causes a decrease in the natural frequency of the building but increases the amplitudes of the forced vibrations.

Avinash Singhal