Moment-Curvature behavior of steel and GFRP reinforced beam using AE and DIC Techniques

Gaurav Sharma, Shruti Sharma and Sandeep K. Sharma

Abstract

Using non-destructive Acoustic Emission (AE) and optical Digital Image Correlation (DIC) methods, the momentcurvature behavior of steel and GFRP bars reinforced concrete beams under flexure was explored in this study. In the tension zone, laboratory studies were carried out on steel-RC and GFRP-RC beams with varying percentages of longitudinal reinforcement ratios of 0.33 %, 0.52%, and 1.11%. The distinct mechanism of cracking initiation and fracture progression of failure in steel-RC and GFRP-RC beams were effectively correlated and picked up using AE waveform characteristics of the number of AE hits and their amplitudes, AE energy as well as average frequency and duration. 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. They display a close matching with the micro and macro-cracks visually observed in the actual beams at various stages of loading.

Key Words

acoustic emission, digital image, hits, moment-curvature, surface strains

Address

Gaurav Sharma: Civil Engineering Department, Amity University, Uttar Pradesh, 201310, India Shruti Sharma: Civil Engineering Department, Thapar Institute of Engineering and Technology, Patiala, 147004, India Sandeep K. Sharma: Mechanical Engineering Department, Thapar Institute of Engineering and Technology, Patiala, 147004, India

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