Use of combinatorial optimisation strategies for model updating of monitored buildings

This paper investigates different optimisation methods for the finite element model calibration of monitored masonry structures affected by earthquakes. The aim is to establish a reference numerical model in support of the existing monitoring systems installed on the structures. The Seismic Observatory of the Structures (OSS), is the Italian network for the permanent seismic monitoring of strategic structures; during the recent seismic events in central Italy (2016) it recorded the data of several masonry buildings. In this paper, the data recorded by the OSS before the seismic events are used to perform an experimental modal analysis and consequently calibrate a FE model. For the tuning of the model, different optimisation methods are employed (i.e. genetic optimisation, particle swarm optimisation, simulated annealing optimisation, etc.) allowing for a first not unique definition of the structural parameters. Starting from the results of the updating a combinatorial parameter selection is performed to get the calibrated finite elements model. The calibrated model can be a useful tool to investigate the dynamic response of the structures, allowing at the same time a preliminary structural assessment.