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The forces acting on bridge structural elements caused by live loads arecomputed by live load models defined in design codes. In most cases, such liveload models are defined by studies performed on girder bridges, where extremevalues of shear forces and bending moment are intended to be predicted. Thispaper shows that when code live load models are applied to truss bridges, theestimated forces in some structural elements may not be representative of thosecaused by actual traffic. Three WIM (weigh-in-motion) databases, which arerecorded on roads in Mexico, are used as real traffic data. The results suggestthat current code live load models are not entirely adequate to estimate forcesin structural elements of truss bridges.

Inconsistencies between the forces from code live load models and real traffic on truss bridges