The role of interventions on roofs n the seismic behavior of masonry churches: studies and observations

A building component that is particularly influential on the seismic response of churches is the roof system, which, depending on its conditions, may either fail and propagate damage to other building areas or, conversely, connect perimetral walls and limit their deformability. , in Italy interventions ordered to repair the roof structure and improve simultaneously the global seismic behavior have been implemented at different times from the second part of the 20th century. In many cases the occurrence of a new earthquake has tested the effectiveness of the works performed and shown some critical aspects. In this work, cases of seismic damage occurred to churches that had previously undergone different types of interventions on their roof structures are examined.