![]() To verify the effects introduced by the number of identified modal parameters on the model updating procedure several analyses are in addition performed. Genetic algorithm (GA) technique is employed for calibration, thus allowing to obtain an accurate and robust numerical model. These modal parameters are subsequently used to calibrate a 3D finite element (FE) model of the Baptistery. Based on experimental results obtained through a temporary network of seismic sensors, the enhanced frequency domain decomposition (EFDD) technique is employed to evaluate frequencies and mode shapes. This paper discusses the assessment of the dynamic behavior of the Baptistery of San Giovanni in Firenze (Italy). When historical structures are investigated this approach is particularly appealing avoiding shaking the structure artificially. Operational modal analysis (OMA), also known as output-only or ambient vibration test (AVT), has become in last decades a powerful approach for a wide range of applications in the field of civil engineering. 2Department of Civil and Environmental Engineering, University of Florence, Florence, Italy.1Department of Earth Sciences, University of Florence, Florence, Italy.
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