ABSTRACT
Second, model the hazards and initial failures confronted by each infrastructure. Infrastructure systems are subjected to different types of external or internal disturbances. However, available historical failure data are used to describe the hazards confronted by each infrastructure system. According to the real data, the number of initial failure components in power grid is described by a powerlaw distribution, and the probability that there is one initial failed pipeline segment is fixed as 1 in gas transmission system under failure cases. Due to the variety and the uncertainty of the disturbance types, the initial failure elements are assumed to randomly select from the system. Also, the hazards on different infrastructure systems are assumed to be independent under a given hazard intensity level (number of initial failure components).
