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Investigation of changes in modal characteristics before and after damage of a railway bridge: A case study
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.ORCID iD: 0000-0003-3070-5434
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.ORCID iD: 0000-0003-0126-1897
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.ORCID iD: 0000-0001-7620-9386
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
2015 (English)In: The IES Journal Part A: Civil & Structural Engineering, ISSN 1937-3260, E-ISSN 1937-3279, Vol. 8, no 2, p. 131-144Article in journal (Refereed) Published
Abstract [en]

The linear, time-invariant transfer function Txy has been utilized for the construction of FRF, based on the ambient vibration measurements. The results presented here indicated the possibility to identify and localize damages in steel railway bridges from the variations in the modal characteristics of the structure. The comparison between the modal characteristics for the healthy and collapsed bridge confirmed that damage had been existed. The abnormal percentage of change in modal damping, between the healthy and any other condition for a structure, can be regarded as a serious indicator for early stages of damage, while the high percentage of change in modal damping can clearly indicate the existence of damage in that structure. The average ratio of change in the damping ratio from the healthy to the collapsed bridge was about 206 % and this ration could be regarded as an index for the existence of a serious damage in steel bridges, which needs further evaluation in other test cases.

Place, publisher, year, edition, pages
2015. Vol. 8, no 2, p. 131-144
Keywords [en]
Structural Identification, Damage Detection, Non-Destructive Evaluation, Health Monitoring., Civil engineering and architecture - Building engineering
Keywords [sv]
Samhällsbyggnadsteknik och arkitektur - Byggnadsteknik
National Category
Infrastructure Engineering Control Engineering Mathematical Analysis
Research subject
Structural Engineering; Control Engineering; Mathematics
Identifiers
URN: urn:nbn:se:ltu:diva-3067DOI: 10.1080/19373260.2015.1020889Scopus ID: 2-s2.0-84928928602Local ID: 0d4f141e-c90a-46ec-8522-13749de68d77OAI: oai:DiVA.org:ltu-3067DiVA, id: diva2:975923
Note
Validerad; 2015; Nivå 1; 20150217 (taredr)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Edrees, TarekNikolakopoulos, GeorgeGrip, NiklasJonasson, Jan-Erik

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