4 - Force transfer mechanisms in composite frames against progressive collapse

Abstract

Compared with beam-column connections, tests and simulations on two-dimensional (2D) frames characterise a more advanced step in investigation of progressive collapse of structures. Apart from compressive arch action and catenary action, studies on 2D frames permit the analysis of connection behaviour and the influence of compressive arch action and catenary action on adjacent structural members. In this chapter, structural behaviour of composite frames with different boundary conditions was experimentally investigated under a central column removal, including bending moment distributions at the middle and side joints. Web cleat and flush end plate connections were selected for the experimental study of composite frames. Influence of reinforcement in composite slabs on rotational capacities of composite beam-column joints was identified. Test data motivated development of component-based models for composite frames. Finally, the key points obtained from experimental and numerical studies were incorporated as sets of recommendations in the design procedure of composite steel frames against progressive collapse.