BRIDGE WEIGH-IN-MOTION SYSTEM DEVELOPMENT USING STATIC TRUCK/DYNAMIC BRIDGE MODELS

Abstract eng:
In this paper, we present recent work on the development of a weigh-in-motion (WIM) system for use on in-service highway bridges. We consider the problem of processing a bridge’s elastic response due to a passing truck and, from it, estimating the truck’s axle weights and gross weight. A dynamic model of the bridge that includes its inertial effects is constructed using a finite element model of an Euler beam. The truck is described using two moving point masses. The deflection of the beam at the midpoint is measured over time, and an optimization routine is employed to estimate the values of unknown parameters. The velocity is assumed to be measured by an independent sensor, and the axle spacing is determined from it, leaving only the weights unknown. The estimated values of the axle weights and total weight of the truck converge to within 0.03% of their true values when no measurement noise was present. When measurement noise was added, the axle weights could be estimated to within less than 3% for noise up to 0.1mm in a signal on the order of 0.2mm.

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