PSI - Issue 28

M.L. Puppio et al. / Procedia Structural Integrity 28 (2020) 330–343 Puppio M.L. et al/ Structural Integrity Procedia 00 (2020) 000–000

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2.4. Volterra On January 31st, 2014, about 35 meters of the city walls of Volterra collapsed in the area between “Porta dell’Arco” and “Piazza dei Fornelli”. In this section the wall had a height of 9.5 meters and a retaining role. The collapse dangerously discovered the foundations of adjacent buildings, as well as Palazzo Stella (Fig. 5). In this case moisture together with recent works on the Natural Gas pipeline probably played a role in the collapse. Evidences of moisture appear on the external face of the historical wall (Fig. 6) before the collapse.

Fig. 5. The collapse on January 2014 of the urban walls of Volterra.

Fig. 6. Trace of moisture before the collapse of urban wall in Volterra (January 2014).