Introspection on improper seismic retrofit of Basilica Santa Maria di Collemaggio after 2009 Italian earthquake |
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| Authors: | Gian Paolo Cimellaro Andrei M Reinhorn Alessandro De Stefano |
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| Institution: | Reinhorn2 and Alessandro De Stefano1§ 1. Department of Structural & Geotechnical Engineering (DISTR) Politecnico di Torino, 10129 Turin, Italy 2. Department of Civil, Structural & Environmental Engineering, University at Buffalo, The State University of New York, Buffalo NY |
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| Abstract: | The 2009 L’Aquila, Italy earthquake highlighted the seismic vulnerability of historic masonry building structures due to improper
“strengthening” retrofit work that has been done in the last 50 years. Italian seismic standards recommend the use of traditional
reinforcement techniques such as replacing the original wooden roof structure with new reinforced concrete (RC) or steel elements,
inserting RC tie-beams in the masonry and new RC floors, and using RC jacketing on the shear walls. The L’Aquila earthquake
revealed the numerous limitations of these interventions, because they led to increased seismic forces (due to greater additional
weight) and to deformation incompatibilities of the incorporated elements with the existing masonry walls. This paper provides
a discussion of technical issues pertaining to the seismic retrofit of the Santa Maria di Collemaggio Basilica and in particular,
the limitations of the last (2000) retrofit intervention. Considerable damage was caused to the church because of questionable
actions and incorrect and improper technical choices. |
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| Keywords: | seismic vulnerability historic masonry building wooden roof structure seismic retrofit L’Aquila earthquake |
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