Operational Modal Analysis of Historical Buildings and Finite Element Model Updating Using α Laser Scanning Vibrometer

Without affecting the integrity or stability of heritage monuments, vibration-based techniques provide useful solutions for acquiring global information about them. By studying dynamic response to suitable excitation sources, it is feasible define mechanical characteristics structures and identify locate defects in their behaviour. Laser Doppler vibrometry (LDV), which enables non-contact measurements vibration velocity moving surfaces using a focused laser beam, highly desirable technique qualitative characterisation damage assessment. LDV simple non-intrusive approach. It permits remote has high degree sensitivity frequency adaptation. In addition, system entirely computer controlled, providing data storage, processing, analysis. been originally researched developed structural modal shape analysis physical prototypes, in-service devices (e.g., machinery components), medical imaging applications, detection relevant small-scale non-destructive testing (NDT), evaluation micro meso-targets fracture mapping composites, objects, etc.). spite several successful applications case bridges thin structures, ambient an integrated form that includes identification, analysis, numerical modelling update employing modern sensor technologies still uncommon. this paper, authors intend explore further possibility combining vibrations OMA combination with sensing order remotely acquire waves travelling historical track actual behaviour such calibrate finite element models.