Abstract
This paper describes a finite element model that has been developed to calculate the live load response of a major steel trussed-arch bridge in Idaho. Any truck configuration (axle loads and spacing) can be modeled as a moving load along one of several predefined load paths. The finite element model calculates the envelope of maximum and minimum live load effects (shear, bending moment or axial force) in the bridge members. Live load tests were conducted to verify the accuracy of the finite element model. A preliminary examination of the results of these tests indicate that the finite element model provides reasonably accurate predictions of live load effects in principal members subjected to direct loads. Live load calculations for indirectly-loaded secondary members were less accurate. Further calibration of the model is expected improve the accuracy of forces and moments predicted in both cases, providing a reliable and flexible bridge rating procedure.
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