Structural Control Toward Structural Robustness

Abstract eng:
“Structural robustness” is a term recently adopted by the literature to frame all the scenarios the designer should add to those required by a mere (semi-probabilistic or probabilistic) safety analysis. These lifecycle scenarios can likely undergo unforeseen accidental situations. The consequences of some of them in terms of progressive collapse can be avoided just by a suitable conception of the structural system. If this is not the case, the structural components will be locally over-designed to avoid that the consequences of damages to structures be disproportionate to the causes of the damages. Active, semi-active and hybrid structural control grew in the last two decades showing their ability to be designed and installed in civil engineering applications. Nevertheless, a strong safety requirement, demanding to provide the safety target even during the failure of non-passive components making a control policy uneconomical. This suggests to investigate different areas of exploitation, which can mainly be grouped in two classes: applications during the construction stage and implementation toward the achievement of a better structural robustness. The latter aspect is discussed in this contribution with reference to two types of structures: suspension or cable-stayed bridges and monumental buildings.

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