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It is shown that this computational approach, with certain assumptions, is capable of quantifying damage resulting from loading and environmental factors. The approach was also used to study different hypothetical scenarios of how this damage could potentially affect the life of bridge components as loading and environmental conditions were varied. A challenging aspect of this research was the calibration of the durability models developed. A detailed study of all INDOT-owned bridges (approximately 6,000) and all Indiana bridges (approximately 18,000) using data from the NBI database was conducted. Three types of bridges were considered in this study: reinforced concrete (RC), pre-stressed concrete (PSC), and steel. The bridges were first classified into 25 different classes according to 5 different levels of loading conditions and 5 different levels of natural conditions. Then, using historical condition rating data from 1994 to 2014 for each of these bridges, a rate of deterioration corresponding to the 25 different classes of bridges was determined. An empirical equation to characterize the variation of these deterioration rates with loading and natural factors was postulated and calibrated with actual data. The relative importance of load-related and natural factors in terms of their effect on the durability of bridge structures was also determined for different bridge types. Joint transportation research program

Efficient Load Rating and Quantification of Life-Cycle Damage of Indiana Bridges Due to Overweight Loads