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Journals / Challenge Journal of Structural Mechanics / 2017 / Cilt: 3 - Sayı: 2

Modal response identification of a highway bridge under traffic loads using frequency domain decomposition (FDD)

Mehmet AKKÖSE
Hugo C. GOMEZ
Maria Q. FENG
Pages
63–71
DOI
—
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

However, to identify lower modes, no vehicle on the bridge is preferred.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:In this study, a four-span, 224m long, post-tensioned concrete box girder bridge sup-ported on single column piers was subject to a series of controlled vehicle tests.
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Key Findings & Data:Bridge acceleration response datasets were used to study the effect of truck speed and a sudden stop, on the modal identification of the bridge structure.
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Conclusion & Impact:However, to identify lower modes, no vehicle on the bridge is preferred.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Özet

In this study, a four-span, 224m long, post-tensioned concrete box girder bridge sup-ported on single column piers was subject to a series of controlled vehicle tests. Bridge acceleration response datasets were used to study the effect of truck speed and a sudden stop, on the modal identification of the bridge structure. Natural fre-quencies and mode shapes of the bridge were determined using the frequency do-main decomposition technique for all datasets. The passing of the truck rendered dif-ficult to identify the first bridge frequency. Conversely, the vehicle tests improved the identification of higher vibration modes. This is because the truck preferentially ex-cites the bridge vertical response, which is associated with higher modes of vibra-tions, especially when a sudden stop of the vehicle occurs. Thus, carefully conducted vehicle-crossing tests provide detailed information about the bridge structure dy-namics in the vertical direction. However, to identify lower modes, no vehicle on the bridge is preferred.

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Cite This Article

AKKÖSE, M., GOMEZ, H. C., FENG, M. Q. (2017). Modal response identification of a highway bridge under traffic loads using frequency domain decomposition (FDD). Challenge Journal of Structural Mechanics, Cilt: 3 - Sayı: 2, 63–71. https://ajindex.com/articles/145884

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