The Dynamic Behavior of the Basilica of San Francesco in Assisi Using Simplified Analytical Models

A critical factor in the collapse of two vaults in Assisi's Basilica of San Francesco during the 1997 earthquake was identified: cumulative structural changes, particularly roof retrofitting. Using simplified analytical models, researchers demonstrated that modifications to the roof, especially a 1958 intervention, stiffened the structure, redistributing seismic loads onto the façade and transept. This overload likely contributed to the vaults' failure. The study highlights how historical interventions can inadvertently alter a structure's dynamic behavior, increasing vulnerability to seismic events.

Arcidiacono, V., Cimellaro, G. P., Piermarini, E., & Ochsendorf, J. (2016). The Dynamic Behavior of the Basilica of San Francesco in Assisi Using Simplified Analytical Models. International Journal of Architectural Heritage, 10(7), 938–953. https://doi.org/10.1080/15583058.2016.1158333