• Special Issues
  • NUMERICAL AND EXPERIMENTAL ASSESSMENT OF THE PERFORMANCE OF FOUR NONDESTRUCTIVE DAMAGE EVALUATION METHODS IN SITUATIONS COMPARABLE TO POST-EARTHQUAKE DAMAGE ANALYSIS

    This study evaluates several methods for the detection and location of a perturbation along a bending beam. Unlike previous studies, the situation chosen is comparable to that encountered in-situ after an earthquake. Indeed, assessment of earthquake damage to buildings is a crucial factor in crisis management. Buildings can be tested appropriately using operational modal analysis methods based on ambient vibration data. In this study, we tested four modal-based methods to locate the perturbation. The mode shapes and eigenfrequencies of a beam were evaluated in the laboratory using the frequency domain decomposition method applied to ambient vibrations simulated along a one-dimensional bending beam, using the finite element method and recorded on a poly(methyl methacrylate) (Plexiglas) beam-like free-clamped structure. The data show that the uniform load surface curvature method is the most efficient, and it allows for accurate estimation of the location of the perturbation, whatever its nature (e.g., multiple, simple, different positions). The experimental data also show that frequency domain decomposition resolution of the mode shapes must be as accurate as possible, otherwise it is impossible to locate transient perturbations over short periods.

     

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  • Uncategorized
  • The Mapping of Post-Earthquake Damage Scenarios in Support of Municipal Emergency Plans

    Nel presente lavoro viene proposta una metodologia, chiamata SCE-PEC, per la rappresentazione di scenari di danno post-sisma /1/, finalizzati agli obiettivi della pianificazione comunale dell’emergenza sismica /2,3/. Uno scenario di danno post-sisma contiene informazioni essenziali per la pianificazione delle attività delle Funzioni di Supporto /4,5/. Detta metodologia utilizza vari tipi di mappe con differenti livelli di elaborazione e sintesi: mappe di base, mappe di danno, mappe di sintesi e mappe per funzioni di supporto. La metodologia SCE-PEC è di tipo modulare e pertanto è possible applicarla parzialmente o integrarla con infor- mazioni aggiuntive.

    For this paper is available an extended abstract after the text in Italian