Before revision: On March 17, 1989, the 255-foot Pavia Civic Tower in Pavia, Italy collapsed after 800 years of stress redistribution on the structure, primarily from drying-induced shrinkage on the wooden support beams, the bells swaying back and forth, and creep.A study on Pavia Civic Tower can be found in Northwestern Universities civil engineering archive and a study about the effects of aging on ancient medieval bell towers was released by the University of Pisa in 2001.
After revision: 78 m ()On March 17, 1989, the 255-foot Pavia Civic Tower in Pavia, Italy collapsed after 800 years of stress redistribution on the structure, primarily from drying-induced shrinkage on the wooden support beams, the bells swaying back and forth, and creep.A study on Pavia Civic Tower can be found in Northwestern Universities civil engineering archive and a study about the effects of aging on ancient medieval bell towers was released by the University of Pisa in 2001.