Quantitative AE Analysis of diagonal-shear failure in reinforced concrete beams

Title: Quantitative AE Analysis of diagonal-shear failure in reinforced concrete beams
Author(s): K. Ohno, M. Ohtsu
Paper category : conference
Book title: RILEM Symposium on On Site Assessment of Concrete, Masonry and Timber Structures - SACoMaTiS 2008
Editor(s): L. Binda, M. di Prisco, R. Felicetti
Print-ISBN: 978-2-35158-061-5
e-ISBN: 978-2-35158-075-2
Publisher: RILEM Publications SARL
Publication year: 2008
Pages: 99 - 108
Total Pages: 10
Nb references: 10
Language: English

Abstract: Disastrous damages due to massive earthquakes in Japan draw a great attention to diagonal-shear failure in reinforced concrete (RC) structures. In RC beams, it is known that the failure type depends on the ratio of the shear span to the effective depth (a/d), and the diagonal-shear failure occurs in the case that a/d<2.7. In this study, RC beams with 1.97 a/d ratio were tested under 4-point bending. AE source mechanisms on crack location, crack type and crack orientation were investigated by applying the SiGMA procedure to detected AE waves. Since classification of crack mechanisms could be performed by AE parameter, results of AE parameter analysis and those of SiGMA analysis were compared. Concerning the discrepancy between these two classified results, the criterion for classification is discussed.
In the tests, three stages in AE generating behaviors are identified, and an accumulation process of microcracks in the shear span is found in advance to nucleation of the final diagonal-shear failure plane.

Online publication: 2009-05-26
Publication type : full_text
Public price (Euros): 0.00