INVESTIGADORES
CURADELLI raul oscar
congresos y reuniones científicas
Título:
Influence of System Uncertainties on Structural Damage Identification through Ambient Vibrations of Steel Structures
Autor/es:
LEANDRO FLECK FADEL MIGUEL; LETÍCIA FLECK FADEL MIGUEL; RIERA, JORGE; AMANI, MARTA; CURADELLI, OSCAR
Lugar:
Rio de Janeiro
Reunión:
Congreso; International conference Stability and Ductility of SteelStructures; 2010
Institución organizadora:
Faculdade de Engenharia da UERJ
Resumen:
The practical difficulties presented by forced vibration testing of large steel structures, such as
tall buildings, transmission lines or bridges, led to an increased interest in structural monitoring through
ambient vibrations, which usually allows the proper identification of modal properties, natural
frequencies, damping and modes of vibration. Changes in these modal properties constitute an indication
of structural damage, which may then be assessed on the basis of experimental evidence. The authors
proposed an approach to determine the so-called damage damping and stiffness matrices, which are
essential to identify the location and intensity of damage. No restrictions were introduced on the damping
matrix of the system. The approach requires ambient vibration data of all relevant coordinates used in
the structural model, which are processed employing the SSI method. In practice, the identification
method is seriously hampered by ambient factors such as temperature or humidity. In general those
effects must be filtered out in other to obtain a reliable diagnosis of damage, approach that demands long
term monitoring. In this paper, an alternative approach is explored, based on the introduction of error
damping and stiffness matrices. Data on both matrices is generated on the basis of observed variations of
structural member stiffness and damping caused by ambient factors. The influence of this uncertainty on
the identified spectral properties is assessed by simulation.