EFFECTIVENESS OF BRIDGE WEIGH-IN-MOTION UNDER MULTIPLE PRESENCE OF VEHICLES

Abstract eng:
The vehicle weight determination obtained from the weigh-in-motion system installed beneath a bridge (Bridge weigh-in-motion, B-WIM) in case of multiple presence of two heavy vehicles simultaneously traveling side-by-side on the bridge is investigated. Mathematically, this becomes an inverse ill-posed problem that is quite difficult to be accurately solved. The identification method, namely the Beta method which were reported to be quite effective for weight identification of single truck passage, is extended to identify the weights of multiple trucks by including the transverse distribution of the wheel loads on each girder. The method is enhanced to capture the effects of multiple trucks on the bridge responses and can be used to identify the weight of each truck. The study will conduct the field test on an actual RC bridge having 2 traffic lanes in one direction and 21.70-meter span. The bridge is composed of 5 girders with RC deck slab. The weigh-in-motion system utilizes 5 strain sensors installed on each girder at the bridge mid-span. The strain data is synchronized with the truck classification system using two laser sensors installed along the bridge barrier. About 8 cases of bridge strain histories under single-truck passages having different speeds and traffic lanes (left or right lane) were recorded. These strain signals are used to artificially construct the bridge responses under multiple presences of two trucks traveling on the bridge side-by-side using linear superposition of two records from single truck passages on left and right lanes. The truck weight identification under generated multiple presences of trucks by using the proposed technique is conducted. Based on the obtained results, the effectiveness of the technique is investigated and discussed.

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