Evaluation and upgrading web-gap distortion retrofits in steel girder bridges

Motaleb, Mehdi; Ibrahim, Ahmed; Lindquist, Will; Hindi, Riyadh

doi:10.1007/s40091-019-00240-y

Cited by 1 publication

(1 citation statement)

References 14 publications

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“…Sosorburam and Yamaguchi (2019) retrofitted the steel truss bridge using buckling resisting dampers for effectively resting the seismic forces. Motaleb et al (2019) evaluated and retrofitted the web girder distortion in a steel girder bridge. Izadi et al (2018) used Fe-SMA strips to retrofit the fatigue cracks developed in the riveted connections of the steel bridge.…”

Section: Introductionmentioning

confidence: 99%

Hilbert transform and spectral kurtosis based approach in identifying the health state of retrofitted old steel truss bridge

Sharma

Kumar

Vinayak

et al. 2021

WJE

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Purpose This study aims to include the diagnosis of an old concrete deck steel truss rural road bridge in the damaged and retrofitted state through vibration response signals. Design/methodology/approach The analysis of the vibration response signals is performed in time and time-frequency domains using statistical features-root mean square, impulse factor, crest factor, kurtosis, peak2peak and Stockwell transform. The proposed methodology uses the Hilbert transform in combination with spectral kurtosis and bandpass filtering technique for obtaining robust outcomes of modal frequencies. Findings The absence or low amplitude of considered mode shape frequencies is observed both before and after retrofitting of bridge indicates the deficient nodes. The kurtosis feature among all statistical approaches is able to reflect significant variation in the amplitude of different nodes of the bridge. The Stockwell transform showed better resolution of present modal frequencies but due to the yield of additional frequency peaks in the vicinity of the first three analytical modal frequencies no decisive conclusions are achieved. The methodology shows promising outcomes in eliminating noise and visualizing distinct modal frequencies of a steel truss bridge. Social implications The findings of the present study help in analyzing noisy vibration signals obtained from various structures (civil or mechanical) and determine vulnerable locations of the structure using mode shape frequencies. Originality/value The literature review gave an insight into few experimental investigations related to the combined application of Hilbert transform with spectral kurtosis and bandpass filtering technique in determining mode frequencies of a steel truss bridge.

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Section: Introductionmentioning

confidence: 99%