Influence of grouted sleeve and concrete strength of fabricated shear wall on acoustic emission detection method for sleeve compactness

Li, Shengli; Liu, Xin; Ma, Yuefei; Zhang, Longguan; Feng, Hu

doi:10.1016/j.jobe.2021.102541

Cited by 11 publications

(9 citation statements)

References 38 publications

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“…The specimen was loaded using load or displacement control. Before the specimen reached its expected peak strength ( N u,cal ) based on the EC4, 27 a load-controlled loading with 5% N u,cal increments was adopted, where the loading rate was set as 0.03 MPa/s when the applied load was less than 60% N u , after which the loading rate was adjusted to 0.02 MPa/s. After the peak strength ( N u,exp ), a displacement-controlled loading at a rate of 0.1 mm/s (the minimum loading rate of the system) was used until the specimen failed.…”

Section: Experiments Setup and Ae Analysis Methodsmentioning

confidence: 99%

“…Several studies indicate that the AE technique is an effective means of detecting such structures. 18,[26][27][28][29] Farhidzadeh et al 26 proposed a probabilistic-based unsupervised pattern recognition algorithm to assess the soundness of the filled concrete in steel-concrete composite shear walls based on AE monitoring. Li et al 27 confirmed that the AE technique can be used to detect sleeve grout compaction in fabricated shear wall.…”

Section: Introductionmentioning

confidence: 99%

“…18,[26][27][28][29] Farhidzadeh et al 26 proposed a probabilistic-based unsupervised pattern recognition algorithm to assess the soundness of the filled concrete in steel-concrete composite shear walls based on AE monitoring. Li et al 27 confirmed that the AE technique can be used to detect sleeve grout compaction in fabricated shear wall. Du et al 28 monitored the axial compression process of the steel tube confined reinforced-concrete columns (STCRC) using AE technique.…”

Section: Introductionmentioning

confidence: 99%

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Damage evaluation and failure mechanism analysis of axially compressed circular concrete-filled steel tubular column via AE monitoring

Gao

Liu

Wang

et al. 2023

Structural Health Monitoring

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Concrete-filled steel tubular (CFST) columns are frequently used as the main load-bearing components in engineering structures due to their excellent load-bearing capacity. However, the presence of steel tube makes it impossible to accurately detect the damage characteristics of concrete by only relying on traditional mechanical measurement methods. This article quantitatively investigates the concrete damage of circular CFST column during axial compression based on the acoustic emission (AE) technique. Through the cumulative AE parameters including amplitude, count, and energy, the axial compression process of the CFST column can be divided into five main stages (Stage I is divided into two substages) to represent the different damage degree. The damage characteristics of concrete at each stage were explained by combining AE results and mechanical phenomena. A sensitivity analysis of the axial compression process was carried out using the Historic Index ( HI) and Severity ( Sr) and found that the sudden rise in HI and Sr corresponded to the changes in the different loading stages. The Improved b ( Ib) value analysis calculated from the AE amplitudes reflects the evolution mechanism of the crack and can be used for the identification of the final failure moment of the specimen. Finally, a new method for processing and analyzing AE parameters was proposed, which effectively enhanced the dimensionality of real-time monitoring information on the damage of concrete filled in the steel tube.

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Section: Experiments Setup and Ae Analysis Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Damage evaluation and failure mechanism analysis of axially compressed circular concrete-filled steel tubular column via AE monitoring

Gao

Liu

Wang

et al. 2023

Structural Health Monitoring

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“…Four AE sensors are arranged on two steel wires in the PSWB. A thin and uniform layer of coupling agent is coated on the surface of the sensor and the steel wire to improve the coupling effect 51 between the specimen surface and the AE sensor. The AE acquisition equipment is connected with the sensor through the amplifiers to collect the AE signal generated by the damage of the PSWB in the tension process.…”

Section: Experimental Validation Of the Proposed Localization Algorithmmentioning

confidence: 99%

Investigation of wave propagation path and damage source 3D localization in parallel steel wire bundle

Liu

2022

Structural Contr & Hlth

Self Cite

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As one of the most important load-bearing components of cable-stayed bridges, the integrity of cables is essential to bridge condition assessment. However, the traditional one-dimensional damage location method has difficulty determining the spatial location of the damage source on parallel steel wire cables.Acoustic emission (AE) technology is a common means of structural health monitoring, and one of its most beneficial attributes is the ability to localize the damage. For this reason, a three-dimensional (3D) location algorithm based on the AE signal propagation path is proposed for cable damage localization. First, the propagation path of simulated AE signals in a parallel steel wire bundle (PSWB) was visualized using COMSOL Multiphysics software platform. Then, a 3D localization algorithm suitable for PSWB damage is proposed based on the propagation path and dispersion characteristics of AE waves. After that, experimental verifications were performed, and it was found that the damage locations can be determined accurately using the proposed algorithm. This algorithm helps to localize the damage source with only a few sensors and is crucial for cable protection and replacement.

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“…Some scholars try to use acoustic emission technology to study the mechanical properties of grout sleeve connection, which has achieved the expected results [ 28 , 29 ]. Based on this, scholars tried to use acoustic emission technology to detect the grouting compactness and they found the change pattern of acoustic emission signal parameters in three conditions of grout, grout void and grouting compactness [ 30 , 31 , 32 ], which shows that it is feasible to apply acoustic emission technology to the detection of grouting sleeve. However, the further quantitative analysis and the identification method of the grouting fullness have not been found in relevant studies.…”

Section: Introductionmentioning

confidence: 99%

Detection of Sleeve Grouting Compactness Based on Acoustic Emission Technology

et al. 2023

Materials

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Sleeve grouting compactness has a significant effect on the mechanical properties of rebar connections. However, a detection method for the grouting compactness inside the sleeve is still lacking. Therefore, the aim of this paper is to propose a new acoustic emission (AE) detection technology for horizontal defects and vertical defects in sleeves with different grout compactness. The basic waveform characteristic of the AE signal is analyzed. The results show that the count of acoustic emission signals decreases with the increase of grouting compactness, and the reduction rate of vertical defects is larger than that of horizontal defects. The acoustic emission waveform is further processed through wavelet packet decomposition. It is found that with the increase of grouting compactness, the composition of approximately 125–187.5 kHz in the signal is accelerated to approximately 62.5–125 kHz. The grouting compactness index is constructed by wavelet packet energy ratio. With the increase of grouting compactness, the compactness index decreases exponentially, indicating that the presence of defects can greatly reduce the attenuation of elastic wave energy. The compactness index is highly consistent with the size of defects and has little relationship with the distribution of grout materials. Experiments show that the proposed method is effective when grout defects reach a certain degree and provides a new method for sleeve grouting compactness detection.

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Influence of grouted sleeve and concrete strength of fabricated shear wall on acoustic emission detection method for sleeve compactness

Cited by 11 publications

References 38 publications

Damage evaluation and failure mechanism analysis of axially compressed circular concrete-filled steel tubular column via AE monitoring

Damage evaluation and failure mechanism analysis of axially compressed circular concrete-filled steel tubular column via AE monitoring

Investigation of wave propagation path and damage source 3D localization in parallel steel wire bundle

Detection of Sleeve Grouting Compactness Based on Acoustic Emission Technology

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