BridgeMon (BRIDGE safety MONitoring) was a European Union 7th framework project funded under the ‘Research for the Benefit of SMEs’ 2011 call. The project ran from 2012 to 2014. The aim of the project was to improve bridge structural health monitoring technologies as follows;
Develop a method of using existing road bridges to weigh vehicles in motion with a step change increase in accuracy;
Develop a novel method of monitoring steel road bridges, susceptible to fatigue damage;
Develop an accurate and cost-effective method of weighing trains in motion;
Develop an improved method of monitoring railway bridges;
During the project, ROD-IS used its expertise in Structural Health Monitoring, traffic loading and finite element analysis techniques, to develop a virtual monitoring concept to assist in evaluating the fatigue life of steel cable stayed bridges. This concept allows for all parts of the bridge that are not monitored directly using sensors to be 'virtually' monitored through simulation using a Finite Element (FE) Analysis. As a result the fatigue damage calculation can be carried out for any location on the bridge, without the requirement for the installation of sensors at the specific location.
To test the accuracy of the virtual monitoring system, a cable-stayed steel box girder bridge near Rotterdam in the Netherlands was instrumented with two monitoring systems: (i) a Bridge WIM (B-WIM) system on the section of the bridge over the road and (ii) a more traditional monitoring system based on strain gauges on the section of the bridge over the canal and inside the pylon. Due to our expertise in Weigh-In-Motion (WIM) Systems ROD-IS presided over the installation and implementation of both the Bridge Weigh-in-Motion (B-WIM) system and the more traditional system. This system not only measures the actual traffic load but the data is also used to calibrate a detailed FE model of the bridge generated by ROD-IS
Following verification of the virtual monitoring system, the fatigue damage calculation was carried out. Using the traffic information from the BWIM system, ROD-IS undertook ‘’scenario modelling’’ which enabled many years of traffic to be simulated from only a few months of measurements. The simulated traffic was used in the fatigue software developed to calculate the accumulated damage at all points on the bridge during its lifetime.
Further information can be found at http://bridgemon.zag.si/