✦ LIBER ✦

DETECTION OF DAMAGE IN BEAMS SUBJECTED TO DIFFUSED CRACKING

✍ Scribed by M.N. CERRI; F. VESTRONI

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 299 KB
Volume: 234
Category: Article
ISSN: 0022-460X
DOI: 10.1006/jsvi.1999.2887

No coin nor oath required. For personal study only.

✦ Synopsis

This paper addresses the problem of identifying structural damage a!ecting one zone of a beam using measured frequencies. The beam model has a zone in which the sti!ness is lower than the undamaged value. Damage is de"ned by three parameters: position, extension and degree, which need to be identi"ed in the inverse problem. The solution of the direct problem is "rst obtained and the peculiarities of damage detection are examined. Two di!erent procedures for damage identi"cation are proposed, which use frequency measurements and take advantage of the peculiarities of the problem: the "rst procedure is based on the characteristic equation error and the second on the comparison between analytical and experimental frequency values. The identi"ability and ill-conditioning properties are discussed by referring to cases with pseudo-experimental data.

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