BRIDGE WEIGH-IN-MOTION SYSTEMS USING STRINGERS OF PLATE GIRDER BRIDGES

A Bridge Weigh-in-Motion system without axle detector is presented. Two stringers located under the deck of plate girder are used for each lane. Velocity is estimated by comparing strain response waves obtained for the two stringers. Gross vehicle weights are estimated by integration of strain response wave and considering truck velocity. The COST-323 accuracy class was found to be D+(20) OR D (25) for test trucks. Wheel spacing can also be estimated from strain response waves. Measurements are carried out for three plate-girder bridges under service condition. Experimental site results and truck load statistics, for a single week, are described.