CFST Rib with Circumferential Gap and SWS Composite Defects

Guo, Chao; Lu, Zhengran

doi:10.1007/s40996-020-00434-5

Cited by 3 publications

(3 citation statements)

References 36 publications

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“…However, CFST structures are prone to yield defects such as interface debonding and concrete core voids due to unavoidable concrete shrinkage and creep and the obvious non-uniform heat distributed due to hydration, temperature difference, construction quality issues, etc. Existing studies show that the ultimate load-carrying capacity and stiffness of CFST members are dramatically weakened due to the loss of the confinement effect of steel tubes on the concrete core and the existence of voids in the concrete core [ 9 , 10 , 11 , 12 ]. Therefore, it is imperative and critical to explore effective defect inspection and health condition assessment techniques for CFST members [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

A Concrete Core Void Imaging Approach and Parameter Analysis of Concrete-Filled Steel Tube Members Using Travel Time Tomography: Multi-Physics Simulations and Experimental Studies

Zheng,

Xu,

Xia

et al. 2024

Sensors

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Concrete-filled steel tube (CFST) members have been widely used in civil engineering due to their advanced mechanical properties. However, internal defects such as the concrete core voids and interface debonding in CFST structures are likely to weaken their load-carrying capacity and stiffness, which affects the safety and serviceability. Visualizing the inner defects of the concrete cores in CFST members is a critical requirement and a challenging task due to the obvious difference in the material mechanical parameters of the concrete core and steel tube in CFST members. In this study, a curved ray theory-based travel time tomography (TTT) with a least square iterative linear inversion algorithm is first introduced to quantitatively identify and visualize the sizes and positions of the concrete core voids in CFST members. Secondly, a numerical investigation of the influence of different parameters on the inversion algorithm for the defect imaging of CFST members, including the effects of the model weighting matrix, weighting factor and grid size on the void’s imaging quality and accuracy, is carried out. Finally, an experimental study on six CFST specimens with mimicked concrete core void defects is performed in a laboratory and the mimicked defects are visualized. The results demonstrate that TTT can identify the sizes and positions of the concrete core void defects in CFST members efficiently with the use of optimal parameters.

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Section: Introductionmentioning

confidence: 99%

A Concrete Core Void Imaging Approach and Parameter Analysis of Concrete-Filled Steel Tube Members Using Travel Time Tomography: Multi-Physics Simulations and Experimental Studies

Zheng,

Xu,

Xia

et al. 2024

Sensors

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“…Besides, debonding defect with a small area is incapable of completely changing the dispersion characteristics of surface waves in SCCS. In addition, the IR method [23], IT method [25], ultrasonic CT scanning test [26], and IE scanning method [4], have been well developed as well as widely applied in the NDT tests on reinforced concrete (RC) specimens. The feasibility of above-mentioned methods for detecting interfacial debondings needs to be synthetically compared in depth.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on interfacial defect detection for SCCS with conventional and novel contact NDT techniques

Chen,

Chalise,

Gan

et al. 2023

Smart Mater. Struct.

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In order to ensure the mechanical performance and structural safety of steel-concrete composite structures (SCCS), advanced nondestructive testing (NDT) technique for bonding status at steel-concrete interfaces needs to be developed. In this study, the feasibility of multichannel analysis of surface waves (MASW)-based interfacial debonding detection is validated using the contact sensors array. Herein, the multichannel sensor arrays are composed of Piezoceramic Lead Zirconate Titanate (PZT) patches and high-frequency acceleration meters, respectively. For comparison, the impact-response method and impact-transmission method are performed utilizing a force hammer and high-frequency acceleration meters, and corresponding damage imaging algorithms are developed. The applicability of ultrasonic computed tomography (CT) scanning test, scanning impact echo method, ultrasonic tomography technique on interfacial debonding detection is further discussed in depth. Research findings indicate that the developed contact MASW measurement can fully capture the variation of dispersion characteristics of surface waves induced by debonding defects in SCCS. The developed impact-response and impact-transmission methods are suitable for detecting interfacial debondings in different dimensions. Besides, the damage nephogram resolution of impact-response is higher than that of the impact-transmission method. In addition, the practicability of traditional ultrasonic CT scanning tests, scanning impact echo method, and ultrasonic tomography techniques using commercial equipment is investigated. Experimental observations show that classical NDT testing techniques are incapable of effectively identifying the existence of interfacial damage and are unsuitable for NDT tests on SCCS. The research findings in this study clearly exhibit the precision and limitation of various contact NDT techniques and lay a solid foundation for interfacial debonding detection in practical SCCS.

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“…For this reason, the prevention of failures through the detection of defects is of great importance in the elaboration of CFST elements, and existing structures using CFSTs. A new ultrasonic index were proposed by Chao G. et al [15,16] to determine the influence of air-void on the final strength of the arch bridge rib of CFST; however, the work did not study the presence of air voids inside the concrete.…”

Section: Introductionmentioning

confidence: 99%

Damage Detection Using Ultrasonic Techniques in Concrete-Filled Steel Tubes (CFSTs) Columns

Callejas

Palma

Hernández-Figueirido

et al. 2022

Sensors

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Concrete-filled steel tubes (CFSTs) are structural elements that, as a consequence of an incorrect elaboration, can exhibit internal defects that cannot be visualized, being usually air voids. In this work, the detection of internal damage in CFST samples elaborated with a percentage of contained air voids in concrete, was carried out by performing a complete ultrasound scan using an immersion tank. The analysis of the ultrasound signals shows the differences presented in the amplitude of the fundamental frequency of the signal, and in the Broadband Ultrasound Attenuation (BUA), in comparison with a sample without defects. The main contribution of this study is the application of the BUA technique in CFST samples for the location of air voids. The results present a linear relationship between BUA averages over the window of the CFSTs and the percentage of air voids contained (Pearson’s correlation coefficient r = 0.9873), the higher percentage of air voids, the higher values of BUA. The BUA algorithm could be applied effectively to distinguish areas with defects inside the CFSTs. Similar to the BUA results, the analysis in the frequency domain using the FFT and the STFT was sensitive in the detection of internal damage (Pearson’s correlation coefficient r = −0.9799, and r = −0.9672, respectively). The results establish an improvement in the evaluation of CFST elements for the detection of internal defects.

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CFST Rib with Circumferential Gap and SWS Composite Defects

Cited by 3 publications

References 36 publications

A Concrete Core Void Imaging Approach and Parameter Analysis of Concrete-Filled Steel Tube Members Using Travel Time Tomography: Multi-Physics Simulations and Experimental Studies

A Concrete Core Void Imaging Approach and Parameter Analysis of Concrete-Filled Steel Tube Members Using Travel Time Tomography: Multi-Physics Simulations and Experimental Studies

Experimental investigation on interfacial defect detection for SCCS with conventional and novel contact NDT techniques

Damage Detection Using Ultrasonic Techniques in Concrete-Filled Steel Tubes (CFSTs) Columns

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