Effect of vehicle weight on natural frequencies of bridges measured from traffic-induced vibration

Kim, Choul‐Young; Jung, Dae-Sung; Kim, Nam-Sik; Kwon, Soon-Duck; Feng, Maria Q.

doi:10.1007/bf02857543

Cited by 92 publications

(30 citation statements)

References 1 publication

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“…For a fixed stiffness, this change in mass would account for a 1.5-3% reduction of the modal frequencies, which is consistent with the variation encountered in Figure 6. This is in direct contrast to the conclusions drawn by Kim et al [7], where traffic loads were not found to influence the modal frequencies of a long-span bridge. It should, however, be noted that the Tamar Bridge has to endure much larger traffic loads than those considered in [7].…”

Section: Dynamic Responsecontrasting

confidence: 99%

“…The response of a long span bridge to high and low wind speeds was investigated in [6], where it was concluded that the modal frequencies decreased with increased response amplitude levels directly caused by increased wind speed. The effect of traffic loading has also been addressed in [7], where, for long span bridges, the influence of traffic loading on the structure's frequency was considered negligible due to the fact that the mass of a single vehicle is very small in comparison to the mass of the 'superstructure'.…”

Section: Results From Tamar Analysismentioning

confidence: 99%

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Long-term monitoring and data analysis of the Tamar Bridge

Cross

Koo

Brownjohn

et al. 2013

Mechanical Systems and Signal Processing

314

180

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A sound understanding of a structure's normal condition, including its response to normal environmental and operational variations is desirable for structural health monitoring and necessary for performance monitoring of civil structures. The current paper outlines the extensive monitoring campaign of the Tamar suspension bridge as well as analysis carried out in the attempt to understand the bridge's normal condition. Specifically the effects of temperature, traffic loading and wind speed on the structure's dynamic response are investigated. Finally, initial steps towards development of a structural health monitoring system for the Tamar Bridge are addressed.

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Section: Dynamic Responsecontrasting

confidence: 99%

Section: Results From Tamar Analysismentioning

confidence: 99%

Long-term monitoring and data analysis of the Tamar Bridge

Cross

Koo

Brownjohn

et al. 2013

Mechanical Systems and Signal Processing

314

180

View full text Add to dashboard Cite

show abstract

“…However, their influence on the bridge response is likely to be negligible. The comparison of the first eigen-frequencies of the bridge deck for the records from figure 4 and from a sample recorded on the previous night did not show any visible modification of the eigen-frequencies of the bridge due to heavy trucks, as it was observed by Kim [6].…”

Section: Resultssupporting

confidence: 48%

Full scale monitoring of wind and traffic induced response of a suspension bridge

Cheynet

Jakobsen

Snæbjörnsson

2015

MATEC Web of Conferences

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Abstract. This paper presents a full-scale analysis of wind and traffic-induced vibrations of a long-span suspension bridge in complex terrain. Several wind and acceleration sensors have been installed along the main span on Lysefjord Bridge in Norway. In the present study, three days of continuous records are analysed. Traffic-induced vibrations are dominant at low and moderated wind speed, with non-negligible effects on the overall bridge response for heavy vehicles only. Traffic and wind-induced vibrations are compared in terms of root mean square of the acceleration response, and three simples approaches are proposed to isolate records dominated by wind-induced vibration. The first one relies on the separation of nocturnal and diurnal samples. The second one is based on the evaluation of the time-varying root mean square of the acceleration response. The last one evaluates the relative importance of the high frequency domain of the acceleration bridge response. It appears that traffic-induced vibrations may have to be taken into account for the buffeting analysis of longspan bridge under moderated wind.

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“…In case the recorded signal is nonstationary, the extracted modal parameters and their derivatives are always in question if FFT is used for modal parameter extraction [14][15][16]. Another disadvantage of FFT is that the frequency components can only be extracted from the complete duration of the signal [17]. Thus, any variation in the frequency content during period of vibration cannot be worked out by FFT.…”

Section: Introductionmentioning

confidence: 99%

Time–frequency and wavelet-based study of an old steel truss bridge before and after retrofitting

Walia

Patel

Vinayak

et al. 2015

J Civil Struct Health Monit

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Signal-processing techniques have been widely used in structural health monitoring and nondestructive evaluation. Wavelet analysis, a relatively new mathematical and signal-processing tool, for damage detection in various civil and mechanical structures. It is a time-frequency analysis that provides more detailed information about nonstationary signals which traditional Fourier analysis miss. This paper aims to provide the damage identification in an existing 100-year-old deck-type steel truss bridge using-frequency-and time-frequency-based approaches. The dynamic testing of steel bridge was carried out using accelerometers for the damaged state and after partial retrofitting under similar environmental conditions and instrumental set up. The comparison is carried out using power spectral density, short-time Fourier transform, and wavelet packet transform with respect to both the upstream and the downstream trusses of the bridge. Higher and uniform dissipation of energy at resonatingfrequency of the respective node after retrofitting showed intactness of joints. The variations of power spectral density in the first mode of the upstream and the downstream trusses clearly revealed improvements in the bridge signifying the importance of generating a signature of bridge before and after retrofitting. The status upgradations for the upstream and the downstream trusses obtained were different due to differential levels of damage in the bridge. Also, after retrofitting, the structural elemental behavior obtained was not the same as desired.

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Effect of vehicle weight on natural frequencies of bridges measured from traffic-induced vibration

Cited by 92 publications

References 1 publication

Long-term monitoring and data analysis of the Tamar Bridge

Long-term monitoring and data analysis of the Tamar Bridge

Full scale monitoring of wind and traffic induced response of a suspension bridge

Time–frequency and wavelet-based study of an old steel truss bridge before and after retrofitting

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