In the framework of a wide investigation campaign carried out by the authors - together with the Polytechnic of Milan - in the churches of St. Biagio d’Amiterno and St. Giuseppe dei Minimi, severely struck by the 6th of April 2009 earthquake, dynamic investigation (Operational Modal Analysis) and structural monitoring were employed in order to obtain a first snapshot of the dynamic characteristics of the aggregate buildings – also for model calibration purposes – and to control their dynamic features with the passing of time. The st. Biagio church’s main damage was the collapse of the tympanum on top of the facade; other damages involved part of the central nave timber vault, the shallow domes of the lateral naves and some cracking of the pillars and of the apses. The rest of the structures showed an overall satisfying seismic performance. The oratory of St. Giuseppe dei Minimi reported higher – however localized - damage: the façade was subjected to a significant overturning mechanism towards the outside, as indicated by the wide cracks on the two side walls, close to the corners. Few other damage mechanisms were detected, such as shear damage in the façade and in the back wall of the apse. The complex is currently undergoing structural interventions, namely repair and seismic improvement, to correct their deficient - however globally satisfying - seismic performance. The paper reports the outcomes of the ambient dynamic identification of the two churches (spring-fall 2010) and of some portions of the surrounding aggregate buildings, which showed - according to their different structural configuration - a marked different dynamic behavior, as well as the results of the first months of the structural static and dynamic monitoring (installed in Dec 2010), consisting of 6 accelerometers, 8 displacement transducers and two temperature and relative humidity sensors.

Dynamic Identification & Monitoring of the churches of St. Biagio and St. Giuseppe in l’Aquila

LORENZONI, FILIPPO;MODENA, CLAUDIO
2011

Abstract

In the framework of a wide investigation campaign carried out by the authors - together with the Polytechnic of Milan - in the churches of St. Biagio d’Amiterno and St. Giuseppe dei Minimi, severely struck by the 6th of April 2009 earthquake, dynamic investigation (Operational Modal Analysis) and structural monitoring were employed in order to obtain a first snapshot of the dynamic characteristics of the aggregate buildings – also for model calibration purposes – and to control their dynamic features with the passing of time. The st. Biagio church’s main damage was the collapse of the tympanum on top of the facade; other damages involved part of the central nave timber vault, the shallow domes of the lateral naves and some cracking of the pillars and of the apses. The rest of the structures showed an overall satisfying seismic performance. The oratory of St. Giuseppe dei Minimi reported higher – however localized - damage: the façade was subjected to a significant overturning mechanism towards the outside, as indicated by the wide cracks on the two side walls, close to the corners. Few other damage mechanisms were detected, such as shear damage in the façade and in the back wall of the apse. The complex is currently undergoing structural interventions, namely repair and seismic improvement, to correct their deficient - however globally satisfying - seismic performance. The paper reports the outcomes of the ambient dynamic identification of the two churches (spring-fall 2010) and of some portions of the surrounding aggregate buildings, which showed - according to their different structural configuration - a marked different dynamic behavior, as well as the results of the first months of the structural static and dynamic monitoring (installed in Dec 2010), consisting of 6 accelerometers, 8 displacement transducers and two temperature and relative humidity sensors.
2011
EVACES '11 Experimental Vibration Analysis for Civil Engineering Structures
9788896225394
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2679065
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