Modified Component-based Model for Single and Double-angle Bolted Connections Used in Braced Steel Frames at Elevated Temperature

The article presents a modified component-based model for single and double-angle bolted connections used in braced steel frames under possible fire hazards. The study presents numerical models using finite element software ANSYS and a parametric analysis carried out on assemblies designed using Eurocode 3 considering bolt grade, number of bolts, angle size, and single/double angle. The analytical approach adopted for the component-based model (CBM) for the connection is used to predict the force-displacement relationships and the ultimate resistance for bolt shear failure and angle bearing. The numerical predictions showed excellent accuracy when evaluating the resistance of bolted angle steel connections at ambient and elevated temperatures. Also, the results revealed that the modified component-based model can effectively estimate the tensile resistance and the ultimate displacement of single and double-angle bolted connections. The modified component-based models can be used to investigate other failure modes like block shear fracture, bearing, and net section failure.