Abstract

The main aim of this chapter is to monitor the cracking and damage assessment in steel-reinforced concrete (steel-RC) and glass fibre polymer-reinforced concrete (GFRP-RC) beams along with varying percentages of tension reinforcement ratio. Beam specimens measuring (150 × 230 × 2100) mm were tested using a four-point bending flexural test using a universal testing machine together with an AE monitoring system. Acoustic emission (AE) has been applied for the early monitoring of steel-RC and GFRP-RC structures using AE parameters such as cumulative AE hits, average frequency, rise angle, amplitude, duration and AE XY plots to evaluate the micro and macro cracking in the steel-RC and GFRP-RC beams specimens. The most popular applications of AE signal in structural health monitoring are specified on crack monitoring, quantifying the degree of damage, and crack classification. In this research, the results indicated that the average frequency and rise angle parameter of AE signal are applied to classify the types of cracks (flexural or shear cracks) that occur in steel-RC and GFRP-RC beams along with varying percentages of tension reinforcement ratio subjected to flexural loading. As a result of these findings, the AE approach may be used to examine crack monitoring and crack classification in steel and GFRP-RC beams with different percentages of tension reinforcement ratios.

Highlights

  • The most common problem associated with coastal infrastructure in metro cities like Mumbai, Bangalore, and Chennai is corrosion, which leads to cracking and resulting in gradual ageing of the structure and its components, as a result of climate change and sea-level rises [1]

  • 4.1 Flexural performance of steel reinforced beams The load-deflection plot of steel-RC beams is broadly classified into three regions un-cracked elastic, cracked-elastic, and plastic zones (Figures 4 and 5)

  • This part of the load-deflection plot from Pcr to Py is termed as cracked-elastic zone II

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Summary

Introduction

The most common problem associated with coastal infrastructure in metro cities like Mumbai, Bangalore, and Chennai is corrosion, which leads to cracking (micromacro) and resulting in gradual ageing of the structure and its components, as a result of climate change and sea-level rises [1]. Some researchers have suggested the use of self-healing micro-capsules for corrosion protection of metal [6, 7] Apart from that, these specific methods have scalability issues in structural applications and are not cost-effective. GFRP bars can be utilised in place of steel rebars in harsh exposure situations such as coastal settings, as well as in a variety of other structural applications such as wharves, box culverts, dry docks, and retaining walls [16]. Due to their linearly elastic stress-strain relationship up to failure, GFRP reinforcing bars react differently from typical steel reinforcing bars. These efforts, which will greatly improve our understanding of how concrete members reinforced with GFRP bars should be analysed, as well as the combination of these techniques, is expected to overcome the shortcomings of the respective techniques, increasing the efficiency of structural inspection and allowing for more frequent monitoring of structures

AE monitoring technique
Specimen details and test matrix
Flexural performance of steel reinforced beams
Flexural performance of GFRP reinforced beams
Effect of longitudinal tension reinforcement ratio on average mid-span deflection
Effect of longitudinal reinforcement ratio on experimental moment carrying capacities
Modes of failure
Average frequency (AF) and rise angle (RA)
II III
AE XY plots monitoring
Conclusion
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