A Risk Management Model for Inter-City Road Systems

Abstract eng:
Seismic risk reduction for the intercity road systems, as the necessary tools for emergency response activities and reconstruction purposes in the aftermath of major earthquakes is of great importance, particularly for those countries which suffer form lack of widely spread reliable transportation networks. Regarding the possibility of complete blockage of the road because of extensive damage to either the road’s body or to the road’s key structural components on the one hand, and decision-making possibility of the people who use or are transferred in the road, as a lifeline (in the contrary to other lifelines which transfer a lifeless product) on the other, the risk evaluation and mitigation of the road systems are much more complicated than other lifelines. In this paper at first the effect of these features on the risk management process are thoroughly discussed, then a risk management model is introduced in which features on which the importance of a road in the transportation system of a county depends, as well as parameters affecting the road function in the aftermath of a major earthquake, are taken into consideration. The proposed risk management model is engaged with complete studies on ‘road body’ and ‘its structural components’; definition of time- and user-dependent earthquake scenarios; and evaluation of earthquake economic losses. The proposed model is applied to Iran intercity road system and a prioritization scheme is suggested, which can be used by the authorities for budget assignment to various provinces of the country for seismic upgrading of the road system.

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