Application of New Stress Test Concepts To Critical Infrastructures. the Case of Thessaloniki Port in Greece.

Abstract eng:
A new engineering risk based methodology for stress tests named ST@STREST developed in the context of the European project STREST (www.strest-eu.org) for non-nuclear critical infrastructures (CIs) is applied to the port of Thessaloniki in North Greece. This case study is a characteristic example of distributed and/or geographically extended infrastructures with potentially high economic and environmental impact, which is exposed to seismic, geotechnical (i.e. liquefaction) and tsunami hazards. The ST@STREST workflow consists of four phases: Pre-Assessment, Assessment, Decision and Report phase, which are performed in sequence. In the pre-assessment phase, all the necessary information of the port is collected and archived in a GIS database. The inventory includes buildings, waterfronts, cranes and their interdependencies with the electric power supply system. Geotechnical, geophysical and topobathymetric data were also collected in this phase. Fragility models for all exposed elements and considered hazards are either selected from the literature or developed as case specific models. Risk measures and objectives are defined related to the functionality of the system and the structural losses. The assessment phase includes the component and the system level assessments. In the first level, the performance of each component is evaluated using a risk-based approach for seismic and tsunami hazards to check whether the component passes or fails the minimum requirements for its performance implied by the code, stakeholders and decision-makers needs. Then, a system level probabilistic risk analysis (PRA) is conducted separately for earthquake and tsunami hazards considering epistemic uncertainties. To reduce the uncertainties in site specific response, a scenario-based risk analysis (SBRA) is also carried out focusing on extreme seismic events. In the Decision phase, the results of risk assessments are compared with the objectives defined in Pre-Assessment phase in order to assess the performance of the CI and decide whether it passes, partly passes or fails the test. This phase also includes identification of critical events and components and strategies to improve the performance and resilience of the port system. In the ultimate phase the results are presented to the port Authority and regulators.

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