The paper deals with the damage assessment and the response analysis of a r/c school building built in the seventies and located in Norcia (Italy). A seismic improvement was carried out in the last decade by the insertion of buckling restrained braces acting as dissipative hysteretic devices. The construction is also equipped with a strong motion monitoring system. The building underwent the last seismic sequence of Central Italy characterized by the main shocks of August 24, 2016 (M6.0), October 26 (M5.4 and M5.9), October 30 (M6.5), and by severe minor quakes. The post-earthquake assessment shows damage to nonstructural elements, particularly to the partitions and infill walls and partly to the external claddings. Modal identifications are done at various conditions, before and after the experienced quakes. To verify the performance of the seismic response of the structural, nonstructural and dissipative systems nonlinear dynamic analyses with the accelerograms recorded on site are performed. The results of the numerical analyses are compared with the actual response shown by the building to verify the correspondence with the actual performances of structural, nonstructural and dissipative systems resulting by the post-earthquake assessment.

Performance of a building with dissipative bracing system under strong earthquakes

Fabrizio COMODINI;Alessandro FULCO;Marco MEZZI
2018

Abstract

The paper deals with the damage assessment and the response analysis of a r/c school building built in the seventies and located in Norcia (Italy). A seismic improvement was carried out in the last decade by the insertion of buckling restrained braces acting as dissipative hysteretic devices. The construction is also equipped with a strong motion monitoring system. The building underwent the last seismic sequence of Central Italy characterized by the main shocks of August 24, 2016 (M6.0), October 26 (M5.4 and M5.9), October 30 (M6.5), and by severe minor quakes. The post-earthquake assessment shows damage to nonstructural elements, particularly to the partitions and infill walls and partly to the external claddings. Modal identifications are done at various conditions, before and after the experienced quakes. To verify the performance of the seismic response of the structural, nonstructural and dissipative systems nonlinear dynamic analyses with the accelerograms recorded on site are performed. The results of the numerical analyses are compared with the actual response shown by the building to verify the correspondence with the actual performances of structural, nonstructural and dissipative systems resulting by the post-earthquake assessment.
2018
9783319757407
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/1463830
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