Effect of CFRP-spacing on fracture mechanism of CFRP-strengthened reinforced concrete beam identified by AE-SiGMA

Alver, Ninel; Tanarslan, Hasan Murat; Sülün, Ömer Yasin; Ercan, Emre; Karcili, Mustafa; Selman, Efe; Ohno, Kentaro

doi:10.1016/j.conbuildmat.2014.05.017

Cited by 19 publications

(6 citation statements)

References 16 publications

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“…Furthermore, effect of steel fiber existence on behavior of the beam and distribution of Ib value were examined. [13,14] . Yine sinyalin sensöre varış zamanının belirlenmesi ile ve çoklu sensör kullanarak kırılmanın yeri de tespit edilebilir.…”

Section: Evaluation Of Acoustic Emission Activities In a Steel Fiber unclassified

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Çelik fiberli betonarme kirişte akustik emisyon aktivitelerinin Ib değeri analizi ile değerlendirilmesi

Tayfur

Alver²,

Saatcı³

2018

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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Ib value analysis was applied to investigate effect of the steel fiber on Ib value.  Damage in steel fiber reinforced concrete beam was evaluated by AE parameter analysis.  Ib value distribution is affected after post-peak because of higher amplitude values due to steel fiber activities. There are numerous nondestructive testing methods that are used to determine damages within structures. Acoustic Emission (AE), being one of these methods makes it possible to obtain significant pieces of information such as origin time, location and type of damage formed in a material during loading by analyzing AE data using various algorithms. Ib value analysis is one of these algorithms which is based on AE signal and this analysis enables to have information on formation of new cracks or propagation of existing cracks by scaling the magnitude of AE activities. In this study, in order to investigate effect of the steel fiber in concrete matrix on Ib value, two reinforced concrete beams were tested under simple bending while one of them was the reference. Afterwards, AE parameters obtained were analyzed, Ib value analyses were applied to amplitude values and these parameters were associated to each other. Furthermore, effect of steel fiber existence on behavior of the beam and distribution of Ib value were examined. Figure A. Ib value vs time distributions of the test specimens Purpose: In this study, it was aimed to evaluate AE activities of plain and steel fiber reinforced concrete beams by Ib value analysis and to reveal effects of steel fiber presence on Ib value distribution. Theory and Methods: Ib value analysis is a technique to evaluate Acoustic Emission (AE) data for scaling failure mechanisms. While higher Ib values indicate more activities having lower amplitude (micro activities), lower Ib values show less activities having higher amplitude (macro activities). Results: Figure A indicates the lowest Ib values in Test Specimen-1 at 41 st and 114 th sec when the beam reached up to 56% and 82% of its ultimate capacity. Likewise, the lowest Ib values in Test Specimen-2 were observed at 69 th and 112 nd sec when the beam reached up to 59% and 75% of its ultimate capacity. These states point out that Ib value gives a warning before macro failures. Decrease of Ib values reveals cracking of concrete matrix in pre-peak region. However, presence of steel fiber affects the Ib value distribution at post-peak region due to higher ductility. Conclusion: Increase in AE energy and amplitude causes lower Ib values because of macro damages. Thus, Ib value can be used as a damage parameter for AE analysis. While higher Ib values indicate micro activities, lower Ib values show macro activities. Presence of steel fiber increases ductility of reinforced concrete beam; thus Ib value distribution is affected after post-peak because of higher amplitude values due to steel fiber activities in this region.

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Section: Evaluation Of Acoustic Emission Activities In a Steel Fiber unclassified

“…Kırılma tipi ise yine sinyal analizi yapılarak SiGMA gibi yöntemlerle belirlenebilir. [13,14]. Ib değeri analizi de AE veri işleme tekniklerinden biridir ve meydana gelen AE aktivitelerinin şiddet dağılımını ölçeklendirir.…”

Section: Evaluation Of Acoustic Emission Activities In a Steel Fiber unclassified

Çelik fiberli betonarme kirişte akustik emisyon aktivitelerinin Ib değeri analizi ile değerlendirilmesi

Tayfur

Alver²,

Saatcı³

2018

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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“…On top of that, the different mechanisms induce different crack tip motion resulting in quite different AE characteristics. This enables passive monitoring and characterization of the dominant fracture mode [22,23]. The information of AE concerns the location of the sources, the amount of activity which is related to the number of active sources and the characterization of the dominant fracture mode.…”

Section: Acoustic Emission Testsmentioning

confidence: 99%

Experimental Structural Analysis of Hybrid Composite-Concrete Beams by Digital Image Correlation (DIC) and Acoustic Emission (AE)

et al. 2015

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The use of composites such as textile reinforced cements (TRCs) and fibre reinforced polymers (FRPs) enables the development of lightweight structures. Such a lightweight solution for floor renovation consists of a hybrid composite-concrete cross section: prefabricated beams (TRC-CFRP reinforced hollow boxes with concrete on top) support sandwich panels together with a finishing concrete compression layer creating a monolithic hybrid floor. As the hybrid beams are the main structural element of this floor system, their load-bearing and failure behaviour should be fully understood. In order to examine the optimal design of these structures in terms of load bearing capacity, the beams are separately tested in four point bending while the amount of CFRP reinforcement and the concrete thickness are varied. The digital image correlation (DIC) and acoustic emission (AE) measuring techniques are applied in a complimentary way to monitor the bending and failure behaviour of the full scale hybrid beams. DIC visualises the development of surface strain fields together with the exact cracking patterns in relation to the applied load. AE contributes in defining the load at the onset of serious cracking activity. Furthermore, AE characterizes the contribution of the different fracture modes that may vary from concrete cracking, delamination between the successive layers of the TRC or debonding at the interphase between the TRC hollow box and the concrete on the one hand and the CFRP on the other hand. B S. Verbruggen svetlana.verbruggen@vub.ac.be

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“…By AE-SiGMA, quantitative crack evaluation has been made in reinforced concrete structures by extensive research [18][19][20][21][22] and the success is proved when the experimental results are examined. Therefore, AE has been successfully applied to provide any information about structural systems in the last decade [23][24][25][26][27][28]. These extensive studies clearly indicate that damage initiation, progression and location of CFRP-strengthened reinforced concrete specimens can be realistically demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Study of fracture evolution in FRP-strengthened reinforced concrete beam under cyclic load by acoustic emission technique: An integrated mechanical-acoustic energy approach

Selman

Ghiami

Alver

2015

Construction and Building Materials

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Effect of CFRP-spacing on fracture mechanism of CFRP-strengthened reinforced concrete beam identified by AE-SiGMA

Cited by 19 publications

References 16 publications

Çelik fiberli betonarme kirişte akustik emisyon aktivitelerinin Ib değeri analizi ile değerlendirilmesi

Çelik fiberli betonarme kirişte akustik emisyon aktivitelerinin Ib değeri analizi ile değerlendirilmesi

Experimental Structural Analysis of Hybrid Composite-Concrete Beams by Digital Image Correlation (DIC) and Acoustic Emission (AE)

Study of fracture evolution in FRP-strengthened reinforced concrete beam under cyclic load by acoustic emission technique: An integrated mechanical-acoustic energy approach

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