Wei, Qingyang and Kövesdi, Balázs Géza and Dunai, László and Cao, Maosen (2024) Formulation of dynamic damage features sensitive to local fatigue cracks in steel bridges: Numerical study. STRUCTURES, 67. No.-107049. ISSN 2352-0124
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Abstract
Fatigue cracks commonly emerge within welding areas of steel bridges with orthotropic decks during the longterm operation. Dynamic-based detection presents an appealing method for detecting such fatigue cracks within steel bridges. Traditional linear dynamic indexes are not significantly affected by the small size of the damage, exhibiting the insensitivity to local fatigue cracks across the entire steel bridges. This study aims to address the dynamic insensitivity and find some potential damage features with practical utility. The fatigue cracks found on the Türr Istvan bridge spanning the Danube River in Hungary are presented, and the bridge models with two types of cracks are established. The local dynamic characteristics of the concerned substructures are isolated from the global characteristics of the entire bridge and used to reflect the local damage information. Accordingly, three potential strategies, namely, (i) impacting vertical ribs to obtain local frequencies, (ii) frequency sweeping the entire bridge system to induce local modes of the longitudinal girders, and (iii) pairwise monitoring of local strains near the crack, are proposed. Numerical results highlight that the sensitivity of local frequencies of vertical ribs is higher than that of global frequencies. The correlation coefficients of the pairs of strains between a crack are significantly decreased compared with those of the uncracked areas. The resonance peaks of the local modes induced by the local frequency-swept excitation migrate leftward while the resonance peaks of the global modes remain unchanged when a crack occurs. The superiorities of three damage features are numerically validated and expected to overcome the insensitivity of the existing dynamic detection methods in detecting local fatigue cracks within steel bridges.
Item Type: | Article |
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Additional Information: | College of Mechanics and Engineering Science, Hohai University, Nanjing, China Department of Structural Engineering, Faculty of Civil Engineering, Budapest University of Technology and Economics, Budapest, Hungary Export Date: 26 August 2024 Correspondence Address: Cao, M.8 Focheng West Road, China; email: cmszhy@hhu.edu.cn Funding details: Magyar Tudományos Akadémia, MTA Funding details: Major International Joint Research Programme, 202112003 Funding details: Major International Joint Research Programme Funding details: Jiangsu Provincial Key Research and Development Program, BZ2022010 Funding details: Jiangsu Provincial Key Research and Development Program Funding text 1: The presented research program has been financially supported by the Grant MTA-BME Lend\\u00FClet LP2021-06 / 2021 \\u201CTheory of new generation steel bridges\\u201D program of the Hungarian Academy of Sciences. The Nanjing International Joint Research and Development Program No. 202112003 is also gratefully acknowledged. Funding text 2: The presented research program has been financially supported by the Grant MTA-BME Lend\\u00FClet LP2021\\u201306 / 2021 \\u201CTheory of new generation steel bridges\\u201D program of the Hungarian Academy of Sciences. The Nanjing International Joint Research and Development Program No. 202112003, and the Jiangsu International Joint Research and Development Program No. BZ2022010 are also gratefully acknowledged. |
Uncontrolled Keywords: | Steel bridges, Fatigue cracks, Dynamic responses, Local modes, Damage features |
Subjects: | T Technology / alkalmazott, műszaki tudományok > TA Engineering (General). Civil engineering (General) / általános mérnöki tudományok T Technology / alkalmazott, műszaki tudományok > TG Bridge engineering / hídépítés T Technology / alkalmazott, műszaki tudományok > TJ Mechanical engineering and machinery / gépészmérnöki tudományok |
SWORD Depositor: | MTMT SWORD |
Depositing User: | MTMT SWORD |
Date Deposited: | 03 Oct 2024 11:16 |
Last Modified: | 03 Oct 2024 11:16 |
URI: | https://real.mtak.hu/id/eprint/206789 |
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