Masonry towers represent an important portion of the cultural heritage in Italy. Their preservation and maintenance through intervention techniques able to guarantee their historical authenticity is essential. Effective structural interventions can be planned only after a deep knowledge of the building and of its structural behaviour. For this purpose, Structural Health Monitoring (SHM) plays a crucial role in providing information both on the dynamic properties of the structures and the damage caused by earthquakes or impacts. SHM can be used either immediately after the event or to monitor the long-term deterioration due to weathering and human use. In the 2011, a static Structural Health Monitoring system (SSHM) was installed in the Two Towers (Asinelli and Garisenda towers), masonry medieval towers located in Bologna, Italy. The data gathered from a SSHM system may be used in conjunction with structural analysis to identify the main vulnerabilities associated with the relevant hazards and the main structural criticalities in order to conceive targeted solutions. From June to September 2012 a dynamic monitoring system has also been installed by the INGV (the Italian National Institute of Geophysics and Volcanology) on the Asinelli tower, the taller of the two. The aims of this paper are: (i) to present the results obtained from the static monitoring system during these first five years of monitoring of the Two Towers and (ii) to identify the dynamic properties and the fatigue behavior due to the traffic load of the Asinelli tower making use of the recorded data by a dynamic monitoring system. First, the order of magnitude of specific reference quantities (extrapolated from the recorded time series) able to characterize the main features of the structural response of the Two Towers are presented. Then, the fundamental frequencies of the tower has been obtained from the experimental measurements and compared with the results of the numerical models. Using an available experimentallybased formulation the fatigue strength has been also evaluated and compared with the stresses induced by the traffic loads recorded during the monitoring.
The static and dynamic monitoring of the Asinelli tower in Bologna, Italy
BARACCANI, SIMONETTA;PALERMO, MICHELE;GASPARINI, GIADA;SILVESTRI, STEFANO;TROMBETTI, TOMASO;
2016
Abstract
Masonry towers represent an important portion of the cultural heritage in Italy. Their preservation and maintenance through intervention techniques able to guarantee their historical authenticity is essential. Effective structural interventions can be planned only after a deep knowledge of the building and of its structural behaviour. For this purpose, Structural Health Monitoring (SHM) plays a crucial role in providing information both on the dynamic properties of the structures and the damage caused by earthquakes or impacts. SHM can be used either immediately after the event or to monitor the long-term deterioration due to weathering and human use. In the 2011, a static Structural Health Monitoring system (SSHM) was installed in the Two Towers (Asinelli and Garisenda towers), masonry medieval towers located in Bologna, Italy. The data gathered from a SSHM system may be used in conjunction with structural analysis to identify the main vulnerabilities associated with the relevant hazards and the main structural criticalities in order to conceive targeted solutions. From June to September 2012 a dynamic monitoring system has also been installed by the INGV (the Italian National Institute of Geophysics and Volcanology) on the Asinelli tower, the taller of the two. The aims of this paper are: (i) to present the results obtained from the static monitoring system during these first five years of monitoring of the Two Towers and (ii) to identify the dynamic properties and the fatigue behavior due to the traffic load of the Asinelli tower making use of the recorded data by a dynamic monitoring system. First, the order of magnitude of specific reference quantities (extrapolated from the recorded time series) able to characterize the main features of the structural response of the Two Towers are presented. Then, the fundamental frequencies of the tower has been obtained from the experimental measurements and compared with the results of the numerical models. Using an available experimentallybased formulation the fatigue strength has been also evaluated and compared with the stresses induced by the traffic loads recorded during the monitoring.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
