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Cracking Mechanism of Corroded Reinforced Concrete Column Based on Acoustic Emission Technique
The Acoustic Emission (AE) technique is applied to study the failure mode, damage evolution process, and cracking mechanism of reinforced concrete (RC) columns under the coupling effect of exterior compression load and interior reinforcement corrosion. AE signals are collected from different loading stages for corroded and uncorroded RC column specimens. Parameter analyses are conducted to analyze the peak frequency, energy distribution, and phase parameters used to achieve the general changing conditions of AE signals. Fast Fourier Transform is applied to reveal the time-variant rules of signal frequency and energy in different damage stages. Discrete Wavelet Transform is used for a better understanding of the local time-frequency properties of the non-stationary AE signals and optimally interprets the damage evolution process of the RC structure. Results show that the peak frequency has a 3-layered distribution; an obvious “double-peak” trend of the energy distribution indicates two cracking mechanisms: steel/concrete interface damage and aggregate/cement damage. The damage process consists of four stages: micro-crack formation, micro-crack development, crack expansion, and cracking failure. The corrosion behavior remarkably influences the energy distributions of the two cracking mechanisms, the characteristics of the spectra in different stages, and the damage evolution process inside the RC columns.
This paper studies the failure mode, damage evolution process, and cracking mechanism of reinforced concrete (RC) columns under the coupling effect of exterior compression load and interior reinforcement corrosion via AE signal analysis. The energy distribution and spectral characteristics show significant differences among different cracking stages. Moreover, those important properties and the damage evolution process are also remarkably affected by the corrosion behavior of the steel reinforcement. The practical meaning of those research outcomes are to provide theoretical supports for the application of AE techniques in the health monitoring of RC structures. The changes in the key properties of AE signals measured and analyzed can be used to capture the state changes and locate the cracking stage, which provides important evidence for the safety evaluation of RC structures.
Cracking Mechanism of Corroded Reinforced Concrete Column Based on Acoustic Emission Technique
The Acoustic Emission (AE) technique is applied to study the failure mode, damage evolution process, and cracking mechanism of reinforced concrete (RC) columns under the coupling effect of exterior compression load and interior reinforcement corrosion. AE signals are collected from different loading stages for corroded and uncorroded RC column specimens. Parameter analyses are conducted to analyze the peak frequency, energy distribution, and phase parameters used to achieve the general changing conditions of AE signals. Fast Fourier Transform is applied to reveal the time-variant rules of signal frequency and energy in different damage stages. Discrete Wavelet Transform is used for a better understanding of the local time-frequency properties of the non-stationary AE signals and optimally interprets the damage evolution process of the RC structure. Results show that the peak frequency has a 3-layered distribution; an obvious “double-peak” trend of the energy distribution indicates two cracking mechanisms: steel/concrete interface damage and aggregate/cement damage. The damage process consists of four stages: micro-crack formation, micro-crack development, crack expansion, and cracking failure. The corrosion behavior remarkably influences the energy distributions of the two cracking mechanisms, the characteristics of the spectra in different stages, and the damage evolution process inside the RC columns.
This paper studies the failure mode, damage evolution process, and cracking mechanism of reinforced concrete (RC) columns under the coupling effect of exterior compression load and interior reinforcement corrosion via AE signal analysis. The energy distribution and spectral characteristics show significant differences among different cracking stages. Moreover, those important properties and the damage evolution process are also remarkably affected by the corrosion behavior of the steel reinforcement. The practical meaning of those research outcomes are to provide theoretical supports for the application of AE techniques in the health monitoring of RC structures. The changes in the key properties of AE signals measured and analyzed can be used to capture the state changes and locate the cracking stage, which provides important evidence for the safety evaluation of RC structures.
Cracking Mechanism of Corroded Reinforced Concrete Column Based on Acoustic Emission Technique
J. Mater. Civ. Eng.
Sun, Bo (author) / Ye, Shenghua (author) / Qiu, Tengfei (author) / Fu, Chuanqing (author) / Wu, Dan (author) / Jin, Xianyu (author)
2023-04-01
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2017
TECHNICAL PAPERS - Assessing Damage in Corroded Reinforced Concrete Using Acoustic Emission
| Online Contents | 2000