Structural Engineering and Mechanics

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Non-destructive evaluation of steel and GFRP reinforced beams using AE and DIC techniques

  • Sharma, Gaurav (Civil Engineering Department, Thapar Institute of Engineering and Technology) ;
  • Sharma, Shruti (Civil Engineering Department, Thapar Institute of Engineering and Technology) ;
  • Sharma, Sandeep K. (Mechanical Engineering Department, Thapar Institute of Engineering and Technology)
  • Received : 2020.01.31
  • Accepted : 2021.01.04
  • Published : 2021.03.10
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Abstract

The paper presents an investigation of the widely varying mechanical performance and behaviour of steel and Glass Fibre Reinforced Polymer (GFRP) reinforced concrete beams using non-destructive techniques of Acoustic Emission (AE) and Digital Image Correlation (DIC) under four-point bending. Laboratory experiments are performed on both differently reinforced concrete beams with 0.33%, 0.52% and 1.11% of tension reinforcement against balanced section. The results show that the ultimate load-carrying capacity increases with an increase in tensile reinforcement in both cases. In addition to that, AE waveform parameters of amplitude and number of AE hits successfully correlates and picks up the divergent mechanism of cracking initiation and progression of failure in steel reinforced and GFRP reinforced concrete beams. AE activity is about 20-30% more in GFRP-RC beams as compared to steel-RC beams. It was primarily due to the lower modulus of elasticity of GFRP bars leading to much larger ductility and deflections as compared to steel-RC beams. Furthermore, AE XY event plots and longitudinal strain profiles using DIC gives an online and real-time visual display of progressive AE activity and strains respectively to efficaciously depict the crack evolution and their advancement in steel-RC and GFRP-RC beams which show a close matching with the micro-and macro-cracks visually observed in the actual beams at various stages of loading.

Keywords

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