PSI - Issue 44

Mauro Mazzei et al. / Procedia Structural Integrity 44 (2023) 1212–1219 Mauro Mazzei et al. / Structural Integrity Procedia 00 (2022) 000 – 000

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on. This activity, along with project documentation, will be a valuable technological support to help operators determine if and when maintenance is needed. For example, inspection activities will not be able to be completed unless all actions on the checklist set in the software are performed. Automated workflow processes can be set up to monitor whether the required tasks have been successfully completed. In addition, the inspection process can only be finalized by the operator following approvals from all required levels of responsibility. This work-flow will enable operators to manage the infrastructure and associated information in a shared and transparent manner. In addition to the purely inspection aspects, each work will be able to be equipped with an electronic register, i.e., a book record that collects and allows easy access to all critical information contained in appropriate databases of construction data, scheduled maintenance, and maintenance operations undergone accompanied by the relevant administrative acts e.g., assignment of tenders. This management level of data collection integrated with real time revelations of the state of the work will allow its optimal management and every single intervention will be able to be traced back to a precise chain of activities and responsibilities with relative control of the quality of the materials used and conformity of the work performed. This advanced management will make it possible, for example, to make available 3D models of the monitored infrastructure, as well as images taken by drones or technicians and processed by artificial intelligence, to classify which sections might require maintenance and suggest the activities to be carried out with further checks and verifications by the operator. The monitoring platform will dialogue in real time with sensors installed on the infrastructure, the number of which will gradually grow. IoT technology will precisely enable the creation of the centralized digital databases containing constantly updated information on all the works put under protection. 2. The focus of dynamic monitoring Based on the design structure of the infrastructure to be monitored, the operating environment, workload, operational risk analysis and its economics, the key points of the monitoring system for infrastructure are as follows: • Structural deformation and vibration monitoring is a classic method for evaluating the overall performance of bridges. It has the advantages of good reliability and strong comparability. Therefore, it is necessary to monitor structural vibration during the operation period. Need to install three-axis accelerometers. • Under the long-term heavy traffic load, the bridge deck is subject to cumulative fatigue damage and can also cause the cumulative damage of various structural elements. Deformation of the bridge section must be monitored. Need to evaluate the behavior of the sensory data with the appropriately modeled FEM model of the infrastructure, for this stage it is very important to establish a priori an exact adjustment of the sensor placement design on the infrastructure being monitored. • Atmospheric temperature has obvious effects on the structure. A temperature meter should be installed to monitor atmospheric temperature near the sensors to understand the influence of atmospheric temperature on the structure. The functional architecture of the system takes the bridge structure as the platform, applies modern sensing technology, communication with the network, optimizes the combination of structural monitoring, environmental monitoring, equipment monitoring, information network analysis and processing, and bridge maintenance management as a complete monitoring system. It monitors real-time changes in the bridge structure in response to various environmental, load and other factors and uses characteristic value analysis in comparison with the building structure to determine the health status of the structure. In order to meet the requirements of the bridge health monitoring system, the overall structure and functions of the monitoring system must be coordinated. The health monitoring system uses non-destructive sensor sensing technology on site collects internal and external structural deformation, vibration and temperature environmental data and transmit them to the data server via wireless networks through communication technology for data processing, analysis and visualization and data storage and query and release data and monitoring results on the Internet. Thus, we believe that one of the main aspects for proper dynamic infrastructure monitoring is strongly related to the type of sensors used and their placement in the monitoring design of the work. This is one of the most