Seismic performance of geographically distributed lifelines: an international overview

In this paper an international overview is provided about the main methods and computational tools available for the development of seismic damage scenarios and for the assessment of the ensuing loss of functionality of selected geographically distributed lifelines, namely transportation networks, electric power systems and potable water systems. The final objective of the study is to provide the Regional RiskScape programme in New Zealand with an engineering basis upon which the losses incurred by lifeline systems can be assessed under the action of different natural hazards. To this aim reliable and worldwide implemented methods have been investigated in order to understand: 1) the parameters adopted for the representation of the ground shaking; 2) the classification system and the asset attributes considered for the implementation of the exposure analysis; 3) the assumed spatial data representation; 4) the technical basis upon which vulnerability, fragility curves, loss and restoration have been developed. The feasibility of implementing the models presented for the seismic performance assessment of lifelines in New Zealand is finally discussed with reference to a study-case.