Research Articles | Challenge Journal of Concrete Research Letters

Damage of Reinforced Concrete qualified by AE

M. Uchida, T. Okamoto, M. Ohtsu
M. Uchida * Taiheiyo Consultant, Japan
T. Okamoto College of Science and Engineering, Ritsumeikan University, Japan
M. Ohtsu Department of Civil and Environmental Engineering, Graduate School of Science and Technology, Kumamoto University, Japan
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Abstract


In order to assess the damage levels of the structures, one criterion based on the Kaiser effect of acoustic emission (AE) is proposed.  AE parameters of load ratio and calm ratio are defined for qualification of the damages.   Accordingly, the feasibility of the damage qualification is experimentally examined by using reinforced concrete beams which are damaged under incremental-cyclic loading.   It is found that the damages qualified by the two ratios are in good agreement with actual damages of the beams.  This suggests that the damages of such reinforced concrete structures in service as bridges, docks and buildings are quantitatively assessed, by simply applying cyclic loading and monitoring AE activity

Keywords


reinforced concrete; acoustic emission; damage assessment; load ratio; calm ratio

References


Ohtsu, M. AReviewof Acoustic Emission in Civil Engineering with Emphasis on Concret,e Journal of AE, 1989, 8(4): pp. 93-98.

Ohtsu, M., Okamoto, T., and Yuyama, S. Moment Tensor Analysis of Acoustic Emission for Cracking Mechanisms in Concrete, ACI Structural Journal, 1998, 95(2): pp. 87-95.

Colombo, S., Forde, M., Das, O. and Halliday, J. AE Experiments on Concrete Beams:GeneralOverview and Reaserch in Progress on Brides, Proc. 9th Int. Conf. on Structural Faults and Repair, 2001, CD-ROM.

Ohtsu, M. Test Method for Damage Qualification of Reinforced Concrete Beams by AE, Materials and Structures, 2010, 43: pp. 1183-1186.

Ohtsu, M., Uchida, M., Okamoto, T. and Yuyama, S. Damage Assessment of Reinforced Concrete Beams qualified by AE, ACI Structural Journal, 2002, 99(4) : pp. 411-417.

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