PSI - Issue 64

Manuel Boccolini et al. / Procedia Structural Integrity 64 (2024) 2206–2213 Manuel Boccolini/ Structural Integrity Procedia 00 (2024) 000 – 000

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2.3. Control Room Upon the transmission of alerts, these are received on the platform and examined in real-time by the Control Room at Manini Prefabbricati S.p.A. (Fig. 5), which continuously monitors the supervised buildings. The early warning service alerts the user of the occurrence of specific events and how the structure responded to the specific events. A threshold is set for each sensor at which the system forwards alarms; these are set in accordance with design criteria and user needs. The monitoring service also includes the sending of bi-monthly and annual reports, detailing the trends of all monitored parameters and highlighting values outside normal conditions. Annual reports provide a broader view of how the structure responded to critical events over the last five years, documenting all threshold exceedances and identifying possible issues. This allows for the organization of predictive maintenance in response to real problems. Annually, a meeting is scheduled to identify maintenance activities carried out and assess the building status based on the events it has experienced; in the case of particularly critical events, the organization of specific maintenance activities will be prompted in line with the building's user manual and maintenance guidelines. The collection of reports, notifications, and minutes provided following maintenance activities allows for the updating of the "building logbook," which tracks events affecting the structure over the years, serving as a useful tool for positioning the property in the market in the event of sale.

Fig. 5. Control Room

2.4. Algorithm for the derivation/integration of data in the time domain Dynamic monitoring involves a special processing that allows, through double integration algorithms, to calculate the displacement experienced in the roof following a major seismic event after the acceleration time history has been recorded. This procedure provides useful information regarding the state of the structure following a seismic event. Data from the base of the smart columns allow the intensity of the event to be placed within the scale of thresholds provided by the standard, while the accelerations received at the intermediate and roof levels are doubly integrated into displacement in the time domain by the algorithms. This allows a direct comparison with the calculation model and the design limit state values provided by the standard. The inclinometer allows the residual rotations of the column head to be recorded at the end of the seismic event. A further activity potentially conducted in case of occurrence of strong motions or windstorms with significant vortex shedding is to compare the acceleration results obtained in real-time by the algorithm with that deduced from FEM analysis.