Instrumentation of three bridges for SiWIM® measurements
Three typical bridges used for bridge WIM measurements were installed to test improvements of the SiWIM® system developed in the BridgeMon project.
- The VA0468 Bridge is a typical medium-span beam-and-slab bridge. It is located near the town of Vransko, in Slovenia, on the A1 motorway, between Ljubljana and the town of Celje and was constructed in 1997. The bridge comprises a single simply-supported span of 24.8m. The superstructure is a double (for each direction of traffic) beam-and-slab bridge, composed of five 1.4 m deep prefabricated prestressed beams per structure with a 240 mm deck slab on top. The bridge was primarily used to develop and test the improved axle detection procedure.
- The VA0028 Bridge is located on the A2 road in the district of Šentvid near Ljubljana in Slovenia. It is a 6-m span box culvert which carries four lanes of traffic, two in either direction. Structurally, the bridge consists of two independent structures, each of which carries two lanes. As a result, the two halves of the bridge are structurally independent of each other. 178 vehicles were statically weighed and compared to the results of the SiWIM® measurements on the bridge to evaluate accuracy of installation on such structure.
- The VA0030 Bridge is a concrete beam-and-slab bridge, which crosses the Sava River. The bridge is made of seven spans, one of which was instrumented for Bridge-WIM testing. The bridge consists of five pre-stressed beams which span 17.5m and are 1.6m deep. The bridge has a 30o skew. 122 vehicles were statically weighed and compared to the results of the SiWIM® measurements on the bridge to evaluate accuracy of installation on such structure.