Significant changes in vehicle loads have occurred in China due to the development of the automobile industry and transportation\nwithin the past two decades, particularly the rapid increase in traffic flow and the large-scale emergence of heavy trucks. However,\nresearch into vehicle loadings on urban bridges is not well developed. In this study, based on traffic flow data collected using a\nweigh-in-motion system installed on an expressway in an urban logistics zone, we analyzed the traffic flow, vehicle types, and gross\nvehicle weight (GVW) features and developed models for the vehicle load and fatigue load. According to the axle space, axle types,\nand axle number, the trucks in the traffic flow were classified into 10 representative vehicle types. The probability distribution of the\nGVW was fitted to a three-class mixed log-normal distribution. Using the improved Gumbel method, we determined the extreme\nvalue distribution of the vehicle loadings in the purpose reference period and assessed the vehicle loadings of urban bridges. In\naddition, using the equivalent damage theory, six equivalent vehicle models were established according to the measurements of the\naxle weight and axle space, thereby obtaining a simplified model of fatigue vehicle loadings on urban expressway bridges.
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