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Wave propagation and scattering in reinforced concrete beams

Wave propagation and scattering in reinforced concrete beams
Wave propagation and scattering in reinforced concrete beams
Steel reinforcement bars (rebars) are vital to the strength of reinforced concrete (RC) structures, but can become damaged due to corrosion. Such damage is generally invisible and non-destructive testing methods are needed to assess their integrity. Guided wave methods are popular because they are capable of detecting damage using sensors placed remotely from the damage site, which is often unknown. This paper predicts free wave propagation in RC beams from which the concept of a guided wave based damage detection method emerges. The wave solutions are obtained using the wave finite element framework where a short section of a beam’s cross section is modeled in conventional finite element (FE) and periodic boundary conditions are subsequently applied. Reinforcement elements are used in the FE model of the cross section as a neat and efficient means of coupling the concrete to the rebars and imposing prestress. The results show that prestress, important for static behavior, has a negligible effect on wave dispersion. A RC beam with a damaged section is modeled by coupling three waveguides, the center waveguide being identical to the outer ones except for a thickness loss in one rebar. Only small differences in cut-on frequencies are observed between the damaged and undamaged sections. However, these small differences give rise to strong reflection of some waves at frequencies close to cut-on. Below cut-on, most incident power is transmitted but experiences wave mode conversion, whereas above cut-on most power is transmitted to the same wave type. These observations form the basis for ongoing work to develop a damage detection technique premised on wave reflection near cut-on.
reinforced concrete beams, Wave propagation, wave reflection, WFE, non destructive testing
0001-4966
3283-3294
El Masri, Evelyne
0d6aa7b3-ce5e-4798-a760-7692a3aca0e6
Ferguson, Neil
8cb67e30-48e2-491c-9390-d444fa786ac8
Waters, Timothy
348d22f5-dba1-4384-87ac-04fe5d603c2f
El Masri, Evelyne
0d6aa7b3-ce5e-4798-a760-7692a3aca0e6
Ferguson, Neil
8cb67e30-48e2-491c-9390-d444fa786ac8
Waters, Timothy
348d22f5-dba1-4384-87ac-04fe5d603c2f

El Masri, Evelyne, Ferguson, Neil and Waters, Timothy (2019) Wave propagation and scattering in reinforced concrete beams. Journal of the Acoustical Society of America, 146 (5), 3283-3294. (doi:10.1121/1.5131644).

Record type: Article

Abstract

Steel reinforcement bars (rebars) are vital to the strength of reinforced concrete (RC) structures, but can become damaged due to corrosion. Such damage is generally invisible and non-destructive testing methods are needed to assess their integrity. Guided wave methods are popular because they are capable of detecting damage using sensors placed remotely from the damage site, which is often unknown. This paper predicts free wave propagation in RC beams from which the concept of a guided wave based damage detection method emerges. The wave solutions are obtained using the wave finite element framework where a short section of a beam’s cross section is modeled in conventional finite element (FE) and periodic boundary conditions are subsequently applied. Reinforcement elements are used in the FE model of the cross section as a neat and efficient means of coupling the concrete to the rebars and imposing prestress. The results show that prestress, important for static behavior, has a negligible effect on wave dispersion. A RC beam with a damaged section is modeled by coupling three waveguides, the center waveguide being identical to the outer ones except for a thickness loss in one rebar. Only small differences in cut-on frequencies are observed between the damaged and undamaged sections. However, these small differences give rise to strong reflection of some waves at frequencies close to cut-on. Below cut-on, most incident power is transmitted but experiences wave mode conversion, whereas above cut-on most power is transmitted to the same wave type. These observations form the basis for ongoing work to develop a damage detection technique premised on wave reflection near cut-on.

Text
JASA146issue5pp3283-3294 final submission - Accepted Manuscript
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More information

Accepted/In Press date: 11 October 2019
e-pub ahead of print date: 12 November 2019
Published date: November 2019
Keywords: reinforced concrete beams, Wave propagation, wave reflection, WFE, non destructive testing

Identifiers

Local EPrints ID: 436385
URI: http://eprints.soton.ac.uk/id/eprint/436385
ISSN: 0001-4966
PURE UUID: 9b41cc0b-a05e-4fc0-afad-cb661f43ab38
ORCID for Neil Ferguson: ORCID iD orcid.org/0000-0001-5955-7477

Catalogue record

Date deposited: 09 Dec 2019 17:30
Last modified: 15 Sep 2021 05:38

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