Active Debonding Detection for Large Rectangular CFSTs Based on Wavelet Packet Energy Spectrum with Piezoceramics

Xu, Bin; Li, Bing; Song, Gangbing

doi:10.1061/(asce)st.1943-541x.0000632

Cited by 86 publications

(56 citation statements)

References 17 publications

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“…With the recent development of piezoceramic transducer-based structural health monitoring and damage detection in civil structures [70][71][72][73][74], especially in concrete-filled tubular structures [75][76][77][78][79][80], as a future work, the authors will explore health monitoring and damage detection of Warren CHS tubular trusses using easily installed piezoceramic patch transducers.…”

Section: Discussionmentioning

confidence: 99%

Experimental Study on the Static Behavior of Reinforced Warren Circular Hollow Section (CHS) Tubular Trusses

et al. 2018

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For truss structures, the question of whether to weld hidden welds or not has been controversial. In the actual construction process of truss structures, the members are usually spot welded in place on the assembly platform, and then welded as a whole, while the hidden welds of the truss are not welded, especially for small pipe diameter trusses. Furthermore, in this study, under hidden weld unwelded conditions, two kinds of reinforcing method (adding a half outer sleeve on each joint and filling concrete into the chord members) are adopted to achieve the purpose of strengthening the truss. Therefore, this paper presents an experimental study on the static behavior of four types of Warren tubular trusses made of CHS members. These four types are (1) T-HW: The truss with hidden welds welded; (2) T-HN: The truss with hidden welds unwelded; (3) TS-AS: The truss strengthened on the basis of T-HN by adding a half outer sleeve on each joint; (4) TS-FC: The truss strengthened on the basis of T-HN by filling concrete into the top and bottom chord members. The mechanical behavior, failure mode, bearing capacity, and load-displacement of all specimens were investigated. The surface plasticity of the bottom chord member, the weld fracture around tubular joints at the bottom chord member, and the bending deformation of the bottom chord member were observed in the tests. Compared with the T-HW specimen, the load carrying capacity of the T-HN specimen decreased by 18%. On the other hand, the T-HN specimen has better deformability than the T-HW specimen. The reinforcing method of adding a half outer sleeve on each joint and filling concrete into the chord members can effectively improve the load carrying capacity and stiffness of the truss, thus reducing the overall deformation of the truss, but the reinforcing method of filling concrete into the chord members is more efficient. of 22trusses under static loading. The failure modes, load carrying capacity, overall deflection, and strain intensity of all test specimens were discussed. Finite element analysis (FEA) software was used for numerical modelling of Warren CHS tubular trusses and the results obtained by numerical analysis were compared with those of the experimental results. Experimental Study Test SpecimensA total of four types of Warren CHS tubular trusses, including the truss with hidden welding welded (T-HW), the truss with hidden welding unwelded (T-HN), the truss strengthened on the basis of T-HN by adding a half outer sleeve on each joint (TS-AS), and the truss strengthened on the basis of T-HN by filling concrete in top and bottom chord members (TS-FC), were designed according to the design guidelines given in the Chinese Standard for Design of Steel Structures (GB50017-2017) [13]. The truss configuration of all specimens is Warren truss with symmetric geometry, loading application, and boundary conditions.The nominal dimensions of CHS members, including chord members, brace members, and lateral bracings of all types of multiplanar tubular trusses, are identical ...

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Section: Discussionmentioning

confidence: 99%

Experimental Study on the Static Behavior of Reinforced Warren Circular Hollow Section (CHS) Tubular Trusses

et al. 2018

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“…The most widely used piezoelectric material is lead zirconate titanate (PZT), which can be either mounted on the surface of existing structures or embedded in new structures [14]. Piezoelectric transducer-based methods are becoming popular in interfacial debonding detection for various structures, including steel reinforced concrete [15], concrete-filled steel tubes [16], and concrete-encased composite structures [17,18]. It was determined from a literature survey, however, that there is a very limited volume of research on the concrete infill detection of concrete-filled composite tubes.…”

Section: Introductionmentioning

confidence: 99%

Concrete Infill Monitoring in Concrete-Filled FRP Tubes Using a PZT-Based Ultrasonic Time-of-Flight Method

Luo

Hei

et al. 2016

Sensors

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Concrete-filled fiber-reinforced polymer tubes (CFFTs) have attracted interest for their structural applications in corrosive environments. However, a weak interfacial strength between the fiber-reinforced polymer (FRP) tube and the concrete infill may develop due to concrete shrinkage and inadequate concrete compaction during concrete casting, which will destroy the confinement effect and thereby reduce the load bearing capacity of a CFFT. In this paper, the lead zirconate titanate (PZT)-based ultrasonic time-of-flight (TOF) method was adopted to assess the concrete infill condition of CFFTs. The basic idea of this method is that the velocity of the ultrasonic wave propagation in the FRP material is about half of that in concrete material. Any voids or debonding created along the interface between the FRP tube and the concrete will delay the arrival time between the pairs of PZT transducers. A comparison of the arrival times of the PZT pairs between the intact and the defected CFFT was made to assess the severity of the voids or the debonding. The feasibility of the methodology was analyzed using a finite-difference time-domain-based numerical simulation. Experiments were setup to validate the numerical results, which showed good agreement with the numerical findings. The results showed that the ultrasonic time-of-flight method is able to detect the concrete infill condition of CFFTs.

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“…Moslehy et al (2010) applied reversed cyclic loading on two circular columns installed with 8 SAs respectively. A proposed wavelet packet energy index was verified effective in the experimental study on a CFST column specimen with artificially mimicked debonding (Xu et al, 2013a(Xu et al, , 2013b. The performance of the crack initiation and propagation approach monitoring using PZT based functional elements for RC joints has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Damage Status Identification of Piezoelectric Concrete Frame Structure Based on Fuzzy Comprehensive Evaluation

Yan¹,

Wang²,

Sun³

et al. 2015

Earth and Space 2014

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The integrity of beam-column joints plays key roles in the earthquake resistant design of reinforced concrete (RC) frame structures. In post seismic behavior evaluation, it is still a challenging task to efficiently monitor the crack initiation and development of RC joints due to inaccessibility. In this study, an active cracking damage initiation and propagation monitoring approach for RC joints using embedded piezoelectric lead zirconate titanate (PZT) based functional elements as both actuators and sensors is proposed. Laboratory test on an exterior beam-column joint specimen subjected to incremental cyclic loadings is performed and the corresponding responses of different sensors are recorded when a certain designated embedded PZT actuator was excited with sweep sinusoidal signals. A health indicator based on the wavelet packet energy (WPE) of embedded PZT sensor measurements was defined to monitor initiation and propagation of cracks in different parts of the RC joint under various loading levels. The monitoring results agree well with the actual crack initiation and propagation pattern observed and the proposed approach by the use of embedded PZT based functional elements can be implemented in practice for the monitoring of RC joints in frame building structures under earthquake loadings. KEYWORDS:Embedded piezoceramic-based functional elements; wavelet packet energy (WPE); crack damage; RC frame joints; smart aggregate Earth and Space 2014 © ASCE 2015 600 © ASCE Earth and Space 2014 Downloaded from ascelibrary.org by University of Texas at San Antonio on 09/18/15.

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Active Debonding Detection for Large Rectangular CFSTs Based on Wavelet Packet Energy Spectrum with Piezoceramics

Cited by 86 publications

References 17 publications

Experimental Study on the Static Behavior of Reinforced Warren Circular Hollow Section (CHS) Tubular Trusses

Experimental Study on the Static Behavior of Reinforced Warren Circular Hollow Section (CHS) Tubular Trusses

Concrete Infill Monitoring in Concrete-Filled FRP Tubes Using a PZT-Based Ultrasonic Time-of-Flight Method

Damage Status Identification of Piezoelectric Concrete Frame Structure Based on Fuzzy Comprehensive Evaluation

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