3 research outputs found
Ambient vibrations of age-old masonry towers: results of long-term dynamic monitoring in the historic centre of Lucca
The paper presents the results of an ambient vibration monitoring campaign
conducted on so-called Clock Tower (Torre delle Ore), one the best known and
most visited monuments in the historic centre of Lucca. The vibrations of the
tower were continuously monitored from November 2017 to March 2018 using
high-sensitivity instrumentation. In particular, four seismic stations provided
by the Istituto Nazionale di Geofisica e Vulcanologia and two three-axial
accelerometers developed by AGI S.r.l., spin-off of the Istituto Nazionale di
Astrofisica, were installed on the tower. The measured vibration level was
generally very low, since the structure lies in the middle of a limited traffic
area. Nevertheless, the availability of two different types of highly sensitive
and accurate instruments allowed the authors to follow the dynamic behaviour of
the tower during the entire monitoring period and has moreover provided
cross-validation of the results
Model Updating Procedure to Enhance Structural Analysis in FE Code NOSA-ITACA
This paper describes a model updating procedure implemented in NOSA-ITACA, a finite-element (FE) code for the structural analysis of masonry constructions of historical interest. The procedure, aimed at matching experimental frequencies and mode shapes, allows for fine-tuning the calculations of the free parameters in the model. The numerical method is briefly described, and some issues related to its robustness are addressed. The procedure is then applied to a simple case study and two historical structures in Tuscany, the Clock Tower in Lucca and the Maddalena Bridge in Borgo a Mozzano