'International Association for Bridge and Structural Engineering (IABSE)'
Abstract
Recently, several structural failures demonstrated the disastrous consequences of progressive collapse and
raised the awareness of the engineering community. However the low probability of progressive collapse
makes it uneconomical to design every building against progressive collapse using conventional design
methods. Furthermore in most cases the initiating events of progressive collapses are unknown during the
design. As such, consideration of secondary load-carrying mechanisms can be an effective alternative. These
mechanisms include compressive arch action (CAA) and tensile catenary action (TCA) in reinforced concrete
(RC) beams. Several researchers have investigated the effects of CAA and TCA experimentally and numerically
in individual RC beams. However to date limited studies have been carried out to study these mechanisms in
RC beam-grids. Hence in this contribution a validated numerical model is developed to study and quantify the
individual contributions and development of the different mechanisms in RC beam-grids. Parametric studies
are performed in relation to the influence of the aspect ratio of the grid, reinforcement ratio and ultimate
reinforcement strain