Ambient Vibrations Applied To San Marino Historical Building Survey

Abstract eng:
The San Marino Historic Centre was included in the UNESCO world heritage list in 2008. The site is located in a region characterized by medium level of seismic hazard. Therefore, mitigating earthquake damages is an important goal for conservation of historical buildings. From an economic point of view, this issue is fundamental in order to sustain tourism, which is a relevant source of local economy. In particular, effective retrofitting interventions require a reliable assessment of seismic vulnerability of unique historic buildings. Seismic retrofitting is a particularly complex task for old structures. A first step in this direction is the evaluation of dynamic response to seismic loads at least in the domain of small strain levels corresponding to the beginning of damage. Several recent studies demonstrate, this task can be achieved in an efficient way by using suitable single station asynchronous ambient vibration measurements. This technique has been applied to three medieval towers and the Palazzo Pubblico located in San Marino and allowed identifying fundamental (elastic) resonance frequency, a key parameter for assessing seismic behavior of historical buildings.

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