Abstract
This paper determines the truck‐load spectra for highway bridges. The weigh‐in‐motion data was collected at weigh stations located on Highways I‐75 and I‐94. The total number of trucks considered in this study is over 600,000. For each truck, the measured parameters include axle loads and axle spacings. Bridge load is considered in terms of moments and shears. Therefore, maximum moments and shears are calculated for each truck for various span lengths. The results are plotted on the normal‐probability paper to facilitate statistical interpretations. The cumulative distribution functions of moments and shears are used to extrapolate the results to predict the maximum forces in longer time periods, up to 75 years. Truck counts were carried out on U.S.‐23 and I‐94 to determine the number of trucks per lane and multiple presence frequency in lane and side by side.
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