COLLAPSE MECHANISMS OF EDGE AND CORNER SLAB PANELS IN FIRE CONDITIONS

摘要

The usage of tensile membrane action for the design of composite floors in steel framed buildings in fire conditions has led to a number of simplified design solutions, like the Bailey-BRE method.This method predicts an enhancement of the slab's yield-line load capacity by membrane stresses,on the assumption of continuous vertical support at all edges.However the vertical support is provided by protected edge beams, which deflect under a combination of heat and loading.The loss of vertical edge support results in an eventual collapse of the entire structure.In recent years four collapse mechanisms of composite slab panels have been proposed.The current research improves upon the predicted failure time for edge slab panels and develops a failure mechanism for slab panels located at the corner of a building.The results are checked against finite element simulations.