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Self-monitoring of a Lightweight Pedestrian Bridge Deck Under Monotonic Loading Using Multiwall Carbon Nanotubes
https://orcid.org/http://orcid.org/0000-0002-7639-6529
https://orcid.org/http://orcid.org/0000-0001-5630-0051
https://orcid.org/http://orcid.org/0000-0002-4560-6597
https://orcid.org/http://orcid.org/0009-0009-8404-7538
https://orcid.org/http://orcid.org/0000-0003-4792-9725
https://orcid.org/http://orcid.org/0000-0002-2118-0528
https://orcid.org/http://orcid.org/0000-0001-5947-1331
This paper presents the self-sensing response of a pedestrian bridge deck that was loaded to failure. Multiwall carbon nanotubes (MWCNTs) were incorporated in lightweight perlite concrete (LWC) to provide self-sensing properties. A deck of 6.60*1.20*0.20 m3, reinforced with glass fiber reinforced polymer (GFRP) rebars was casted using the produced MWCNTs-LWC. Two stainless-steel mesh electrodes were also casted near to middle at the tension zone of the deck and connected with a LCR bridge in order to continuous measure the electrical impedance of the MWCNTs-LWC. The deck was subjected to three-point bending test, where loading and unloading cycles of increasing levels were applied. The self-sensing capabilities of the MWCNTs-LWC deck were evaluated by measuring the fractional change of impedance (FCI) of the concrete which it has been compared to its strain. Correlations between FCI and strain, in respect with stress and time within the elastic region were established. The sensitivity (FCI to stress ratio) and the gauge factor (slope of the FCI – strain line) have been defined from FCI –stress and FCI – strain plots, respectively. The results showed very good stress-to-FCI correspondence at the executed load pattern that allowed to qualitatively characterize the stress status of the deck. In addition, the analysis of the timeline diagrams of the load (or stress), the strain and the FCI, may be used to assess self-sensing ability and reliability, where the sensitivity and the gauge factor could serve as quality indices for the assessment of the self-sensing functionality.
Self-monitoring of a Lightweight Pedestrian Bridge Deck Under Monotonic Loading Using Multiwall Carbon Nanotubes
https://orcid.org/http://orcid.org/0000-0002-7639-6529
https://orcid.org/http://orcid.org/0000-0001-5630-0051
https://orcid.org/http://orcid.org/0000-0002-4560-6597
https://orcid.org/http://orcid.org/0009-0009-8404-7538
https://orcid.org/http://orcid.org/0000-0003-4792-9725
https://orcid.org/http://orcid.org/0000-0002-2118-0528
https://orcid.org/http://orcid.org/0000-0001-5947-1331
This paper presents the self-sensing response of a pedestrian bridge deck that was loaded to failure. Multiwall carbon nanotubes (MWCNTs) were incorporated in lightweight perlite concrete (LWC) to provide self-sensing properties. A deck of 6.60*1.20*0.20 m3, reinforced with glass fiber reinforced polymer (GFRP) rebars was casted using the produced MWCNTs-LWC. Two stainless-steel mesh electrodes were also casted near to middle at the tension zone of the deck and connected with a LCR bridge in order to continuous measure the electrical impedance of the MWCNTs-LWC. The deck was subjected to three-point bending test, where loading and unloading cycles of increasing levels were applied. The self-sensing capabilities of the MWCNTs-LWC deck were evaluated by measuring the fractional change of impedance (FCI) of the concrete which it has been compared to its strain. Correlations between FCI and strain, in respect with stress and time within the elastic region were established. The sensitivity (FCI to stress ratio) and the gauge factor (slope of the FCI – strain line) have been defined from FCI –stress and FCI – strain plots, respectively. The results showed very good stress-to-FCI correspondence at the executed load pattern that allowed to qualitatively characterize the stress status of the deck. In addition, the analysis of the timeline diagrams of the load (or stress), the strain and the FCI, may be used to assess self-sensing ability and reliability, where the sensitivity and the gauge factor could serve as quality indices for the assessment of the self-sensing functionality.
Self-monitoring of a Lightweight Pedestrian Bridge Deck Under Monotonic Loading Using Multiwall Carbon Nanotubes
https://orcid.org/http://orcid.org/0000-0002-7639-6529
https://orcid.org/http://orcid.org/0000-0001-5630-0051
https://orcid.org/http://orcid.org/0000-0002-4560-6597
https://orcid.org/http://orcid.org/0009-0009-8404-7538
https://orcid.org/http://orcid.org/0000-0003-4792-9725
https://orcid.org/http://orcid.org/0000-0002-2118-0528
https://orcid.org/http://orcid.org/0000-0001-5947-1331
This paper presents the self-sensing response of a pedestrian bridge deck that was loaded to failure. Multiwall carbon nanotubes (MWCNTs) were incorporated in lightweight perlite concrete (LWC) to provide self-sensing properties. A deck of 6.60*1.20*0.20 m3, reinforced with glass fiber reinforced polymer (GFRP) rebars was casted using the produced MWCNTs-LWC. Two stainless-steel mesh electrodes were also casted near to middle at the tension zone of the deck and connected with a LCR bridge in order to continuous measure the electrical impedance of the MWCNTs-LWC. The deck was subjected to three-point bending test, where loading and unloading cycles of increasing levels were applied. The self-sensing capabilities of the MWCNTs-LWC deck were evaluated by measuring the fractional change of impedance (FCI) of the concrete which it has been compared to its strain. Correlations between FCI and strain, in respect with stress and time within the elastic region were established. The sensitivity (FCI to stress ratio) and the gauge factor (slope of the FCI – strain line) have been defined from FCI –stress and FCI – strain plots, respectively. The results showed very good stress-to-FCI correspondence at the executed load pattern that allowed to qualitatively characterize the stress status of the deck. In addition, the analysis of the timeline diagrams of the load (or stress), the strain and the FCI, may be used to assess self-sensing ability and reliability, where the sensitivity and the gauge factor could serve as quality indices for the assessment of the self-sensing functionality.
Self-monitoring of a Lightweight Pedestrian Bridge Deck Under Monotonic Loading Using Multiwall Carbon Nanotubes
Lecture Notes in Civil Engineering
Ilki, Alper (editor) / Çavunt, Derya (editor) / Çavunt, Yavuz Selim (editor) / Tsivolas, Konstantinos (author) / Christidis, Konstantinos (author) / Papantonopoulos, George (author) / Studziński, Paweł (author) / Żach, Juliusz (author) / Taxiarchou, Maria (author) / Badogiannis, Efstratios (author)
International Symposium of the International Federation for Structural Concrete ; 2023 ; Istanbul, Türkiye
2023-06-03
12 pages
Article/Chapter (Book)
Electronic Resource
English
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