PSI - Issue 44

Gianluca Salamida et al. / Procedia Structural Integrity 44 (2023) 131–138 Gianluca Salamida et al. / Structural Integrity Procedia 00 (2022) 000–000

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Fig. 1. Ground Motion Analysis Toolbox: spectra in terms of pseudo-acceleration, pseudo-velocity, displacements and spectra in ADRS format for Mirandola station recordings for the 29 May 2012 Emilia shock (only horizontal components are shown). Calculated spectra are overlapped with those provided by Italian Building Code, thus obtain a comparison. Ground motion directionality is considered by computing the IMs in different directions; in particular, pseudo acceleration spectra are calculated for different directions with increments of 2.5 degrees. This allows to determine rotation interdependent IM values. As an example, Fig. 2-left shows the acceleration spectra evaluated in the various horizontal directions for the ground motion recording produced by the Mirandola station during the 29 May 2012 Emilia earthquake; a contour plot that shows, as a function of period and direction, the spectral intensity normalised to its maximum value (for the current direction) is reported in Fig. 2-right.

Fig. 2. Panel for the study of earthquake directionality (29 th May 2012 Emilia earthquake, Mirandola station). Left: spectral pseudo-acceleration evaluated in different directions. Right: contour showing normalised PSA values as a function of period and direction.