Analysis and Solution to Human-Induced Lateral Vibrations on a Historic Footbridge

Wilkinson, Sean; Knapton, J

doi:10.1061/(asce)1084-0702(2006)11:1(4)

Cited by 5 publications

(6 citation statements)

References 3 publications

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“…This result is not an artifact of the software used, for same results that were derived also after FFT analysis as presented in Table . Slight differences between results coming from different or even similar excitation events are common in experimental data and are usually dealt with smoothing of the response spectra. In the present study, it was shown that such small differences are also evident in independent data as well; hence, they may reflect data noise.…”

Section: Discussionmentioning

confidence: 99%

“…During the experiments reported in this paper, a group of pedestrians performed synchronized jumps along the vertical axis in the middle of the bridge central span. The main span of the bridge is hence expected to bend along the vertical axis, whereas a lateral movement is also possible given the recent experience . No significant longitudinal deflections are, however, typically expected.…”

Section: The Studied Footbridgementioning

confidence: 99%

“…3. Measure and analyze oscillations in three axes (vertical, lateral, longitudinal) generated by apparently vertical motions; a topic of extreme importance for structural engineering, especially following the recent experience of the Millennium Bridge in London and various other footbridges [23][24][25][26][27]. 4.…”

Section: Introductionmentioning

confidence: 99%

“…The focus of the present paper is fourfold. Measure displacements and natural frequencies from different collocated sensors, providing independent estimates, thus permitting to compare the performance of each sensor. Compare excitation time histories, in the time and the frequency domain, between time intervals corresponding to motion and no motion, and hence permitting to identify the characteristics of measurement noise. Measure and analyze oscillations in three axes (vertical, lateral, longitudinal) generated by apparently vertical motions; a topic of extreme importance for structural engineering, especially following the recent experience of the Millennium Bridge in London and various other footbridges . Use GNSS data, and not only GPS data, as was the case with most studies so far. This may prove very useful, given the obstruction in view of satellites due to structural elements of the bridges and the circulating vehicles and the need for additional/different satellite signals.…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional dynamic deflections and natural frequencies of a stiff footbridge based on measurements of collocated sensors

Moschas

Stiros

2013

Struct. Control Health Monit.

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SUMMARYA redundant system of collocated geodetic sensors and an accelerometer were used to measure the displacements of a stiff, 40-m-long footbridge excited by essentially vertical synchronized jumps. A main output of the measurements was that excitations produced vertical deflections (of the order of several mm), lateral deflections with an amplitude about half that of the vertical, an effect known for various bridges, and also smaller-scale longitudinal deflections, probably induced by the vertical ones. This combination of deflections in three axes is not an artifact of measuring errors, or of limitations of specific instruments, and do not reflect random effects, for they have been observed in different experiments by different sensors (Global Navigation Satellite System-GNSS, i.e., Global Positioning System-GPS plus the Russian Global Navigation Satellite System-GLONASS), robotic total stations-RTS (or robotic theodolite), and an accelerometer, and were tested through control of the measurement errors from time series reflecting no bridge oscillations. In all cases, sensors provided similar estimates of deflections and of deflection-derived dominant frequencies, which were found equal to those derived from the accelerometer. The proposed instrumentation and methodology seem suitable to control deflections of bridges in cases that visibility of satellites is poor or is disrupted by vehicle circulation. Measurement-based modeling of bridges described might be useful for understanding the structural behavior of bridges under several types of dynamic loads and can contribute to the displacement-based design of structures.

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Section: Discussionmentioning

confidence: 99%

Section: The Studied Footbridgementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Three-dimensional dynamic deflections and natural frequencies of a stiff footbridge based on measurements of collocated sensors

Moschas

Stiros

2013

Struct. Control Health Monit.

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“…Had the natural frequencies of the structure been similar to the pedestrian pacing frequencies, the structure might have become resonant. 4,5 This could have led to high values of displacement and acceleration, causing discomfort for users.…”

Section: Assess Ment Of Humaninduced Vibrationsmentioning

confidence: 99%

The Role of Vibration Analysis in the Design of the Pedestrian Walkway Extension of the Principe Umberto Bridge in Legnago, Italy

Bullo¹,

Marco

2008

Structural Engineering International

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Feasibility study of a large-scale tuned mass damper with eddy current damping mechanism

Wang

Chen

Wang

2012

Earthq. Eng. Eng. Vib.

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In the case of a thin surface precision mechanical device, it is often accompanied by mechanical vibration, mechanical vibration will reduce the precision of the device. In order to eliminate the influence of the vibration, the surface eddy current damper is introduced, which can quickly generate the damping force of multi degree of freedom, and has the advantages of simple structure, high safety and reliability. The mechanism of the eddy current damper is analyzed, and based on the calculation and analysis of the electromagnetic damping force, the vibration suppression effect of the eddy current damper is designed. The experimental results show that the surface mechanical device of precision parts vibration when using eddy current damper, vibration suppression of surface mechanical device type disk can be effective, the fast response speed, high reliability and safety, which has important reference value for the study of vibration reduction of panel type precision machinery parts.

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Analysis and Solution to Human-Induced Lateral Vibrations on a Historic Footbridge

Cited by 5 publications

References 3 publications

Three-dimensional dynamic deflections and natural frequencies of a stiff footbridge based on measurements of collocated sensors

Three-dimensional dynamic deflections and natural frequencies of a stiff footbridge based on measurements of collocated sensors

The Role of Vibration Analysis in the Design of the Pedestrian Walkway Extension of the Principe Umberto Bridge in Legnago, Italy

Feasibility study of a large-scale tuned mass damper with eddy current damping mechanism

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