On the Assessment of Robustness I: A General Framework

Authors

Jack W. Baker, Daniel Straub, Kazuyoshi Nishijima and Michael H. Faber

Abstract

A framework for assessing robustness is proposed, taking basis in decision analysis theory. The framework is consistent with probabilistic assessment methodologies of e.g., the Joint Committee on Structural Safety. Robustness is assessed by computing both direct risk, which is associated with the direct consequences of potential damages to the system, and indirect risk, which corresponds to the increased risk of a damaged system. Indirect risk can be
interpreted as risk from consequences disproportionate to the cause of the damage, and so the robustness of a system is indicated by the contribution of these indirect risks to total risk. A framework is presented for measuring
robustness in this way, and implications for system modelling and acceptable levels of robustness are discussed. Robustness is interpreted here as damage tolerance, but the assessment procedure can be broadened to consider other aspects of robustness such as tolerance to human error in design or construction.

Published in/by

Workshop Robustness of Structures, November, 28-29, 2005 BRE, Garston, Watford, UK.
Available on http://www.jcss.ethz.ch/