This paper deals with the updating of a finite element model of a three-span concrete highway bridge using experimental data. The finite element model was kept as small as possible in order to keep the computational requirements of the updating procedure to a minimum. The response functions of the bridge were measured at 65 points using impact testing and the initial correlation of the experimental and theoretical models was found to be satisfactory. The updating was performed using a sensitivity-based algorithm and the response predicted by the updated finite element model was found to be in very good agreement with the measured data.
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