On the monitoring of historic Anime Sante church damaged by earthquake in L’Aquila

摘要

The paper shows the activity of a 2-year static and dynamicmonitoring activity to check the structural response and thenactual level of damage of a historic church hit by earthquake in L’Aquila (Italy) in 2009. Structural health monitoringnwas carried out with accelerometers and transducers that recorded time histories of the main earthquake-inducednground motions and ambient vibrations. The paper focuses particularly on residual performance and assessment ofnthe ancient church after six earthquake response data set—because of the seismic swarm—via a modal identificationnof output-only systems by using frequency domain decomposition. In this way, fundamental frequency, mode shapes,ndamping ratios and displacements can be estimated without knowing the input that has excited the system. Thendynamic monitoring provides also a way to check possible drops of tension in the cables and relaxation in the FRPnbelts used for safety. Efficiency and reliability of modal identification of basilica-type churches, via the dynamicnresponse of macro-elements only in comparison with the whole analysis, are finally proposed. Copyright © 2012 JohnnWiley & Sons, Ltd.