Composite connections are those, where composite beam frames into a composite column.
Composite beam is composed of steel section with concrete slab connected by means of shear
connectors which enables them act integrally. The composite column considered in this study
is concrete encased column. Encased Concrete columns are becoming popular in high-rise
buildings in medium to high seismic zones due to their ease in connecting to the beam. Conventional joints involve diaphragm plates welded to the beam. Due to their poor performance in earthquakes; welded connections are not preferred in seismic regions. The failure of connections during the Northridge earthquake has emphasized the importance of overall behaviour of frames in seismic regions. In practical cases, fixed and pinned connections are used in numerous analysis and design procedures. But at the same time, semi-rigid connections have to be considered as it is the most realistic type and it serves as a more accurate representation of the behaviour of the structure and results in economy. In high seismic zones, a connection which shows symmetric behaviour under sagging and hogging moments is preferred. Hence, a numerical analysis is carried out to investigate the performance of semi-rigid connections with standard HSFG bolts. Cyclic load of incremental amplitude will be applied on the joints and seismic behaviour and failure mechanism will be observed using finite element analysis in terms of energy dissipation capacity, ductility, strength and stiffness.

Keywords:
Composite beam,
Encased concrete column,
Standard HSFG bolts,
Semi-rigid connections,
Finite element analysis,
Cyclic load of incremental amplitude &
EC 4