A "new" design requirement: the mitigation of the progressive collapse of buildings under exceptional loading

Recent events such as natural catastrophes or terrorism attacks have highlighted the
necessity to ensure the structural integrity of buildings under an exceptional event.
According to the Eurocodes and some different other national design codes, the structural
integrity of civil engineering structures should be ensured through appropriate measures
but, in most cases, no precise practical guidelines on how to achieve this goal are provided.
At Liège University, the robustness of building frames is investigated with the final
objective to propose design requirements to mitigate the risk of progressive collapse
considering the conventional scenario “loss of a column” further to an unspecified event.
In particular, a complete analytical procedure has been developed for the verification of the
robustness of steel or composite plane frames. For sake of simplicity, these first works
have been based on the assumption that the dynamic effects linked to the column loss were
limited and could therefore be neglected. More recently, complementary works have been
carried out with the objective to address the dynamic effects. Besides that, the extension of
the static procedure to actual 3D frames is under investigation in Liège. The present paper
gives a global overview of the ongoing researches in the field of robustness at Liège
University; in particular, the global strategy to derive design requirements is detailed.