ABSTRACT
This paper presents a long-term monitoring system providing the information for the maintenance and management of extradosed bridges. Since an extradosed bridge is such a specific type of structure that needs to pay more attention and consider in more detail, the developed system was built during the construction of the monitored bridges. The long-term monitoring system includes varied types of sensors, such as the tiltmeter on the top of the pylon, the displacement meter on the expansion joints, the vibration-based cable force sensor on the cables, the displacement settlement sensor in the girders and the environmental sensors such as wind meter and temperature sensors. Furthermore, the loading tests were conducted before the opening of bridges. The field test provides a benchmark record of structural behavior before the bridge opened to traffic and also to verify the performance of the developed system in the field. The loading test data is used to calibrate the analytical parameters of bridge models and help to define the initial values of the bridge long-term monitoring system. Thus, the analysis of structural stress, segment deflection, and cable forces will feedback result in field measurement work. Then the suggestions and the strategy of maintenance and management of the bridge can be drawn up appropriately.
