DAMAGE DETECTION USING THE FREQUENCY-RESPONSE-FUNCTION CURVATURE METHOD

✍ Scribed by R.P.C. SAMPAIO; N.M.M. MAIA; J.M.M. SILVA

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 315 KB
• Volume: 226
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1999.2340

✦ Synopsis

Structural damage detection has gained increasing attention from the scienti"c community since unpredicted major hazards, most with human losses, have been reported. Aircraft crashes and the catastrophic bridge failures are some examples. Security and economy aspects are the important motivations for increasing research on structural health monitoring. Since damage alters the dynamic characteristics of a structure, namely its eigenproperties (natural frequencies, modal damping and modes of vibration), several techniques based on experimental modal analysis have been developed in recent years. A method that covers the four steps of the process of damage detection*existence, localization, extent and prediction*has not yet been recognized or reported. The frequency-responsefunction (FRF) curvature method encompasses the "rst three referred steps being based on only the measured data without the need for any modal identi"cation. In this paper, the method is described theoretically and compared with two of the most referenced methods on literature. Numerically generated data, from a lumped-mass system, and experimental data, from a real bridge, are used for better illustration.