Reliability Analysis of Oregon Bridges Using Weigh-in-Motion (WIM) Data

Yanık A., Higgins C.

El-Cezerî Journal of Science and Engineering, vol.6, pp.736-747, 2019 (Peer-Reviewed Journal)


In this study a reliability analysis was carried out for Oregon bridges. Different bridge types that are non-composite steel girder, reinforced concrete T-beam, and prestressed concrete girder bridges were considered. Reliability indices were calculated for various span lengths and girder spacing. Reliability indices were estimated for AASHTO HS20 design loading considering a five-year evaluation period. The actual average daily truck traffic (ADTT) values were used during the calculation. Four WIM sites from Oregon state were taken into account in the analysis. These sites correspond to three different levels of ADTT which are approximately ADTT= 5,000, ADTT = 1,500 and ADTT ≤ 500 cases. The distinction of this paper from the existing literature is the large amount of WIM data used in the analysis. The resulting reliability indices ranged from 2.4 to 6.4 for different span lengths, girder spacing, load effects (moment or shear), type of girder and ADTT level. These indices were compared with the existing ones presented in the literature.