Local failure of one structural element may result in the failure of another structural element. Failure might thus progress throughout a major part or even all of the structure. After reviewing a couple of failure events, it is outlined why current probabilitybased design codes are inadequate to prevent progressive collapse. It is discussed how these shortcomings might be overcome both within and outside a probabilistic framework. A pragmatic approach is suggested in which design according to current practice is complemented by additional design measures with particular regard to collapse resistance.

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Definitions for the terms collapse resistance and robustness are proposed. Based on an analysis of the shortcomings of current design methods, a pragmatic approach for designing against progressive collapse is suggested and a set of design criteria is presented. Design strategies based on preventing or presuming local failure are compared. Furthermore, the alternate-load-paths approach is compared with the compartmentalization approach concerning their applicability to different types of structures and design objectives. Structural Engineering International 2/2006

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