This paper introduces a procedure for the seismic vulnerability evaluation and functionality assessment of the transportation systems in large cities, which is based on a probabilistic vulnerability evaluation of various components of the system and all other facilities affecting its function. The main idea is considering different states of damages for various components of all interacting lifeline systems, including the transportation system, as well as other influencing facilities such as high-rise buildings, with regard to different hazard levels. By determination of failure probability of each component, and then by assigning an importance factor to each component of the transportation system one can estimate the vulnerability of the whole system and accordingly its functionality. Regarding the numerous encountering problems in a large city it should be divided into different parts for the study. This partitioning can be performed based on the probable origin-destination pairs to which the transportation system should serve after the earthquake. Probabilistic studies show that, from the interaction point of view, the water system has the most adverse effect on the transportation system, especially in the older parts of the large cities. The results show that rushing of people into streets can cause a serious problem, which is very crucial, and the prediction of its quality and quantity needs a multi-aspect study, involving the population in each district, the location and distribution of rescue and relief centers in the city, the intensity of damages in different parts of the city, and finally the public awareness in this regard.
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