PSI - Issue 44

Davide Arezzo et al. / Procedia Structural Integrity 44 (2023) 2098–2105 D. Arezzo at al./ Structural Integrity Procedia 00 (2022) 000 – 000

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After the seismic swarm, the structure was secured with different interventions. The main one involved the construction of a massive external steel retaining structure (Figure 2c), designed to prevent the evolution of the façade's overturning mechanism. The structure encloses the front side and the two lateral sides (Figure 2e) of the front façade body for its entire height. The stability of the system in case of extreme events and the confinement of the church body are provided by fourteen steel cables connected to the steel structure. The collapsed masonry parts on the lateral walls of the façade, produced by the overturning mechanism, were filled with steel lattice systems to restore the gravitational load paths. Finally, a temporary roof was installed to protect the interior of the church, along with a reticular structure built to prevent further out-of-plane collapses of the tiburium walls (Figure 2d). Further information on the church can be found in the work of Arezzo et al (2021).

(a) (c) Fig. 1. Photos of the church before the 2016 seismic sequence (a) facade; (b) church interior; (c) fake dome. (b)

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Fig. 2. Photos of the church damaged by the 2016 earthquake and of the securing system: (a) collapse of the rear part of the tiburium and of the belfry; (b) collapse of the roof and of the fake dome; (c) external steel securing system, front view; (d) internal latticed system; (e) external steel securing system, lateral view.