Abstract
The study examines the assessment method for the safety of concrete bridges in the Korean expressway using the probabilistic concept. The reliability-based assessment methods available are reviewed, and the assessment results from the different methods are compared through field applications. A comparison of the assessment results from the available international assessment codes or guidelines showed that the current assessment method in Korea provides a very conservative result. The evaluation using the proposed assessment method, considering the reduced uncertainty in the assessment and corresponds to the newly issued bridge design code in the limit-state format, revealed a considerably improved rating factor. To take the characteristics of the limited truck traffic of the expressway into account, a live load model is constructed using the site-specific truck information in a statistical manner and used to evaluate the load rating. In addition, a new updating process for an analytical model of a bridge using measured response is presented. The reduced live load of the expressway increased the rating factor of the test PSC (Prestressed Concrete) girder bridge in a Korean expressway. The rating factor of the test bridge was increased further by applying the updated analytical model.
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