Condition-based risk assessment and management for infrastructure retrofit in the face of uncertainty

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The societal living and economic growth rely heavily on critical infrastructural systems, with the assets value of about $1.1 trillion in Canada. However, according to the 2016 Canadian Infrastructure Report Card, 35% of those infrastructure assets are in fair, poor or very poor condition, due to aggressive environmental attacks (e.g., corrosion) and recurring low- or moderate-intensity hazard events (e.g., earthquakes). The degradation, in the form of progressive structural/material deteriorations and shock-based physical damage, reduces the performance of engineering structures. In recognition of devastating life safety and economic consequences potentially caused by their failure or loss of functionality in extreme hazard events, the condition-based risk assessment and management (e.g., through optimum retrofit) of existing infrastructure systems has become an emergent need in recent years.