OMAX testing of a steel bowstring footbridge

Reynders, Edwin; Degrauwe, Daan; Schevenels, Mattias; Roeck, Guido De; Broeck, Peter Van den; Deckers, Kristel; Guillaume, Patrick

doi:10.1007/978-1-4419-9316-8_15

Cited by 4 publications

(6 citation statements)

References 8 publications

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“…Also shown in Figure 5 are the ambient acceleration levels at the measurement locations (characterized by the maximum RMS-value of the vertical acceleration) mainly due to the wind and the passing traffic on the highway. These ambient vibrations were recorded for a period of 13 minutes during the operational modal analysis test [3]. Based on Figure 5, it can be concluded that all performed tests generate acceleration levels which are significantly higher than the ambient vibration levels.…”

Section: Discussionmentioning

confidence: 96%

Measurement and Prediction of the Pedestrian-Induced Vibrations of a Footbridge

Broeck¹,

Roeck²,

Reynders³

et al. 2009

Noise & Vibration Worldwide

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Vibration serviceability has become an important issue in the design of modern slender footbridges with large spans. This paper presents the measurements and the numerical predictions of the footfall-induced vibrations of a pedestrian bridge. A series of experiments were carried out with different-sized groups crossing the bridge, varying in number from 10 up to 50 participants and recording the vertical and lateral accelerations at different locations on the bridge. Two types of tests were performed: free walking and synchronized walking by means of a metronome signal, recorded on a tape recorder carried by the group of students. The effect of the test type is analyzed and shows a magnitude in difference between the vertical accelerations caused by the free and the synchronized walking. The increasing trend of the acceleration levels with increasing group size is also clearly observed. A numerical prediction method is used to simulate the synchronized walking experiments based on an updated finite element model of the bridge and a single pedestrian load model. It is shown that the predicted acceleration level is sensitive to the assumptions made regarding the level of synchronization between the pedestrians and the magnitude of the dynamic load generated by each pedestrian. Taking into account these specific measurement conditions, a fair agreement is obtained between the predicted and the observed vertical acceleration levels at seven positions along the length of the footbridge.

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Section: Discussionmentioning

confidence: 96%

Measurement and Prediction of the Pedestrian-Induced Vibrations of a Footbridge

Broeck¹,

Roeck²,

Reynders³

et al. 2009

Noise & Vibration Worldwide

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“…The OMAX method is applicable in case of combined excitations and smoothly degenerates into either EMA either OMA configurations as the magnitude of one type of loading becomes negligible with respect to the other. The recognized advantages of OMAX [2,3] are (i) to rely on two families of excitations to excite many modes, (iii) to deal with situations where IOP Publishing doi:10.1088/1742-6596/2647/12/122015 2 the vibration level of the two types of loading (measured/unmeasured) are similar, (iii) to be able to determine mass-scaled quantities even in case of environmental noise [2,4,5], which would not be possible with OMA on its own. The University of Liège has created a shaker capable of moving masses ranging from 80-320 kg within a frequency range of 0 to 12 Hz and an amplitude of up to 150 mm, see Figure 2.…”

Section: Introductionmentioning

confidence: 99%

Modal analysis of a footbridge under pedestrian traffic and additional shaker loading

Purpura,

Güner,

Hoffait

et al. 2024

J. Phys.: Conf. Ser.

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This paper investigates the possibility of identifying the modal properties of footbridges while they are subjected to pedestrian traffic using the CSI algorithm. The analysis is based on vibration data collected from a footbridge under different pedestrian densities. The results show that the CSI algorithm provides consistent modal properties, but the identified damping ratio seems to be significantly influenced by pedestrians. This is likely due to the human-structure interaction. Identified apparent damping ratios appear plausible, but of course not representative of the bare structure. Overall, while the CSI algorithm helps alleviate the limitations of the authors’ previous approache to modal identification with a custom shaker, the practical usefulness of identifying modal properties of footbridges under pedestrian traffic is therefore limited.

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“…Different approaches to perform a modal analysis on civil constructions such as bridges are commonly in practice [1][2][3][4][5][6][7][8][9][10][11][12]. Depending on the excitation used these methods are divided into Experimental Modal Analysis (EMA) or Operational Modal Analysis (OMA).…”

Section: Introductionmentioning

confidence: 99%

“…It is shown that the PAM can aide in identifying eigenfrequencies and mode shapes that are badly excited by ambient excitation alone. In [6] this actuator is compared to other more commonly applied actuation methods. There are several different comparison criteria like e.g.…”

Section: Introductionmentioning

confidence: 99%

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Implementation of the Scanning Laser Doppler Vibrometer Combined with a Light-Weight Pneumatic Artificial Muscle Actuator for the Modal Analysis of a Civil Structure

Deckers

Guillaume

Vuye

et al. 2012

Shock and Vibration

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Abstract. The identification of the modal parameters of bridges and other large civil constructions has become an important research issue. Different approaches have been proposed depending on the excitation used: ambient excitations (due to wind, traffic, . . .) or artificial excitations (e.g. impact test with heavy drop weights). In practice it turns out that not all modes are well excited by the ambient forces. Hence the application of an artificial actuator is advisable. The problem is that larger constructions often require large and heavy excitation devices, which are hard to manipulate. Another difficulty encountered in performing a modal analysis on large civil constructions is the necessity for a large number of high sensitivity sensors. Consequently a large number of cables has to be installed resulting in a large setup time.This paper is a proof-of-concept which demonstrates the possibility of using lightweight Pneumatic Artificial Muscles combined with the scanning laser Doppler vibrometer to perform a modal analysis on a civil structure. This combination allows for an important reduction in setup time and allows for sine testing as well as the application of broadband signals such as periodic chirps, true noise or multisines.

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OMAX testing of a steel bowstring footbridge

Cited by 4 publications

References 8 publications

Measurement and Prediction of the Pedestrian-Induced Vibrations of a Footbridge

Measurement and Prediction of the Pedestrian-Induced Vibrations of a Footbridge

Modal analysis of a footbridge under pedestrian traffic and additional shaker loading

Implementation of the Scanning Laser Doppler Vibrometer Combined with a Light-Weight Pneumatic Artificial Muscle Actuator for the Modal Analysis of a Civil Structure

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