Civil structures having social, cultural heritage and architectural relevance are these where a systematic and accurate monitoring system is often needed. The nature of the events that could affect the health of a structure, such as earthquakes or severe weather phenomena, is – to a large extent – unknoun. The intensity of these phenomena isn't foreseeable, nor is the moment when they will occur. Restoration or reinforcement works are further situations where the static and dynamic conditions

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... a structure could be impaired. In all these conditions, the availability of a continuous and real time structural health monitoring is obviously useful in the detection of a potentially dangerous situation for the structure and its occupants. When it comes to historic buildings, the utility of having a health monitoring system is more evident, because of the greater fragility of these kinds of structures. Hence is the need to design a monitoring system for the main spire of Milan's Duomo.