Seismic performance of multi-storey RC SMRF and OMRF buildings

Abstract

Reinforced concrete moment resisting frames are one of the widely used lateral load resisting systems. Special moment resisting frames (SMRFs) are known for its enhanced ductility capacity and used for the same in high seismic risk zones. In this study, performance assessment of multi-storey RC special moment resisting frames (SMRFs) and ordinary moment resisting frames (OMRFs) is presented to compare the base shear capacity and ductility of the buildings using SAP2000 software. The nonlinear static analysis i.e. pushover analysis is adopted for studying the behaviour of SMRFs and OMRFs. The effect of infill walls are also taken into account in terms of base shear and roof displacement. The buildings response reduction factors are obtained from the capacity curves obtained for each modelled building by studying its behaviour parameters such as overstrength factor and ductility reduction factor. The FEMA P695 methodology is used to calculate response reduction factors.