Vol.3, No 13, 2003 pp. 755-764
UDC 624.012:620.179(045)
DAMAGE DIAGNOSTIC IN CONCRETE AND MASONRY
STRUCTURES BY ACOUSTIC EMISSION TECHNIQUE
A. Carpinteri, G. Lacidogna
Department of Structural Engineering and Geotechnics,
Corso Duca degli Abruzzi 24 - 10129 Torino, Italy
The damage diagnostic of reinforced concrete structures or masonry buildings
represents a complex task. Therefore, monitoring techniques are assuming
an increasing importance in the evaluation of structural conditions and
reliability. Heterogeneous materials like concrete or masonry, when subjected
to increasing stresses, provide a typical power-law relation between the
energy released by microcracks, detected by Acoustic Emission (AE) technique,
and the frequency of AE events. This Technique permits to estimate the
amount of energy released during the fracture process and to obtain information
on the criticality of ongoing process. Moreover, by applying Fracture Mechanics
criteria, the safety of structures undergoing damage and degradation process
can be efficiently evaluated in situ.
DIJAGNOSTIKA OŠTEĆENJA BETONSKIH I ZIDANIH
STRUKTURA PUTEM TEHNIKE AKUSTIČNOG EMITOVANJA
Dijagnostika oštećenja ojačanih betonskih struktura ili zidanih gradjevina
predstavlja jedan složen posao. Stoga tehnike monitoringa dobijaju sve
veći značaj u proceni strukturalnih uslova i pouzdanosti. Heterogeni materijali
poput betona ili ozida, kada se podvrgnu rastućim naponima, pružaju tipičan
odnos po zakonu snage izmedju energije koju oslobadjaju mikroprsline, a
koja se pronalazi tehnikom akustičnog emitovanja (AE), i frekvencije AE
dogadjaja. Ova tehnika dopušta procenu količine energije koja se oslobodi
tokom procesa loma, i dobijanje podataka o kritičnosti procesa koji je
u toku. Štaviše, primenom kriterijuma mehanike loma, bezbednost struktura
koje podležu procesu oštećenja i propadanja se na efikasan način može oceniti
in situ.
