FraMCoS 9 2016 Berkeley, California, USA

An Acoustic Emission Study of Mixed Mode Crack Propagation in Reinforced Concrete Beams

This paper presents an experimental study on mixed crack propagation in reinforced con- crete beam. The specimen was reinforced with single longitudinal bar of diameter 8mm (percent- age=0.66%) with no stirrups. The notch is provided at the quarter span, as…

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Year 2016
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Abstract

This paper presents an experimental study on mixed crack propagation in reinforced con- crete beam. The specimen was reinforced with single longitudinal bar of diameter 8mm (percent- age=0.66%) with no stirrups. The notch is provided at the quarter span, as it is the region prone for mixed mode crack initiation and propagation. The specimen is tested in three point bending under displacement/stroke control in the closed loop servo controlled hydraulic testing machine. The results of load, displacement, CMOD and strain in the steel are acquired in the data acquisition system. The results were analysed and related failure mechanisms observed in reinforced concrete are cracking, yielding of steel, shear, slippage and de-bonding between steel and concrete. The acoustic emission technique is used for monitoring the crack growth in reinforced concrete beam using six AE-sensors mounted on the specimen. The acoustic emission events location is used to understand the cracking and fracture process in zone of tensile and shear cracking. The AE data of events, amplitude, abso- lute energy and time are analysed to understand cracking, energy released and fracture processes in opening and mixed modes and to compare them.