Impact of heavy trucks on highway bridges

Impact of heavy trucks on highway bridges Conference

Liu, C, Shahawy, M, Wang, TL et al. (2000). Impact of heavy trucks on highway bridges . 279 1527-1534. 10.1061/40513(279)199

Dynamic impact of multigirder steel bridges is investigated based on three-dimensional nonlinear truck models derived from actual heavy truck traffic. Truck traffic data is collected by weigh-in-motion (WIM) measurements. Multigirder bridges are treated as grillage beam system. Road surface roughness is generated as transversely correlated random processes. Trucks with significant counts are selected to calculate impact factors, which are obtained based on twenty - time simulations. Dynamic responses are obtained by combining static responses and impact factors. The results from a site on I-75 indicate that the truck traffic with average daily truck traffic (ADTT) of 1,065 causes little fatigue damage on steel girders of Categories A and B. Accumulated fatigue damage due to each truck type is calculated and the trucks causing the most fatigue damage are found. © 2004 ASCE.