1Post graduate Student, Department of Civil Engineering, The National Institute of Engineering, Mysore
2Associate Professor, Department of Civil Engineering, The National Institute of Engineering, Mysore
Online published on 8 May, 2017.
Reinforced concrete moment resisting frames (RCMRF) are structural systems when subjected to seismic loading should be designed to ensure proper dissipation capacity. To have good ductility and a preferable collapse mechanism in the structure “strong-column/weak-beam ” the capacity approach is currently used in practice. In a structure when flexural strength of longitudinal beams controls the overall response, RC beam-column connections display ductile behaviour. For ensuring good global energy dissipation without much degradation of capacity at the connections, failure mode where in the beams form hinges are considered to be most favourable. Many codes recommend the moment capacity ratio at beam column joint to be more than 1 but lot of discrepancies and Indian standard is silent on this aspect. So in the present study pushover analysis is being carried out using SAP2000 for increasing moment capacity ratio at beam column joints and its effect on lateral strength and global ductility of structure is observed. Moment capacity ratio (MCR) increases ductility of structure. Structures designed with lesser MCR values found to be more prone fail in storey mechanism.
Regular and irregular buildings, Pushover, moment capacity ratio, ductility, lateral strength
