The paper is divided in three parts. In the first part the history of the domes and their realisation are vINm2%*zJ
shortly presented: the Pantheon, Hagia Sophia, St. Mary of the Flower in Florence, St. Peter in [ Y.3miE
Rome. 1]#qxjZ~
In the second part the behaviour of Hagia Sophia is analysed through its history, the observation of kpi)uGvGUA
the present damage and mathematical models. The study shows how the dome collapsed several _*B]yz6z
times in its history. %qRbl4
The third part shows the collapse of two vaults of the Basilica of St. Francis of Assisi hit by a strong G 8OLx+!0e
earthquake on 26 September, 1997. H2 7_T]\
The mathematical model and photographic records explain the mechanism of collapse. Finally the ;1}~(I#Y
reinforcements have been achieved using composite materials with aramidic fibers to strengthen the A7DEAT))4L
deformed existing vaults.
