The present study proposes the definition of service life and the end-of- life criterion for bridge maintenance. Bridges begin to deteriorate as soon as they are put into service. Effective bridge maintenance requires sound understanding of the deterioration mechanism as well as the expected service life. In order to determine the expected service life of a bridge for effective bridge maintenance, it is necessary to have a clear definition of service life and end-of-life. However, service life can be viewed from several perspectives based on literature review. The end of a bridge’s life can be also defined by more than one perspective or performance measure. This study presents definition of service life which can be used for bridge maintenance and the end-of life criterion using the performance measure such as a damage score. The regression model can predict an average service life of bridges using the proposed end-of-life criterion.

This paper presents the definition of bridge life and the end-of-life criterion of bridge for bridge maintenance purpose. Bridge life can refer to the period of time in which the bridge meets all desired levels of its functions maintained by maintenances. The end-of-life criterion of bridge can defined when a damage score of an entire bridge reach 0.64, the bridge is assumed to be end of life.