Analysis of Mid-Rise Moment Resisting Steel Frames by Nonlinear Time History Analysis using Force Analogy Method

This paper presents a detailed systematic investigation to assess detailed dynamic behaviours of mid-rise moment resisting steel frames by performing nonlinear time history analysis using force analogy method. Both material and geometric nonlinearities have been considered in the analysis. Three building heights with seven earthquake ground accelerations have been examined. The building responses in terms of floor displacement, storey drift ratio and plastic energy dissipation have been investigated. It has been found that maximum seismic responses occur within 18–40% height of the building. Further, the position of maximum response along the building height has been seen to decrease as the height of building decreases. It has also been seen that building responses, when excited by short period ground accelerations, decreases when the building height increase; whereas building responses, when excited by long period ground accelerations, increases when the building height increases. In general, maximum seismic responses have been found to be more consistent with peak ground velocity rather than peak ground acceleration. © 2021, The Institution of Engineers (India).