Experimental identification of pedestrian-induced lateral forces on footbridges

Ingólfsson, Einar Thór; Georgakis, Christos Τ.; Ricciardelli, Francesco; Jönsson, Jeppe

doi:10.1016/j.jsv.2010.09.034

Cited by 107 publications

(80 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In contrast to what has been previously reported for vibrations in the lateral direction [6], the pedestrians here were found to always add damping vertically to the bridge when walking across it. The measured added damping had some level of scatter in it, due to the stochastic nature of the pedestrian loading.…”

Section: Resultscontrasting

confidence: 99%

Change in Mass and Damping on Vertically Vibrating Footbridges Due to Pedestrians

Georgakis

Jørgensen²

2013

Topics in Dynamics of Bridges, Volume 3

View full text Add to dashboard Cite

Pedestrian-induced footbridge vibrations are an issue that bridge designers often have to contend with. A plethora of research in recent years has led to the development of load models and procedures that allow for the determination of footbridge response. Nonetheless, measured footbridge responses often deviate from those predicted. One of the main deficiencies of the existing models and guidelines is the exclusion of the effect of changes in the footbridge's dynamic properties due to the presence of pedestrians. More specifically, any change in mass and/or damping that a pedestrian might introduce to a bridge will affect the bridges overall dynamic response. This effect is an element of what is often referred to as human-structure interaction. In this paper, the results of an experimental study to determine the change in mass and damping of a vertically vibrating footbridge due to traversing pedestrians are presented.

show abstract

Section: Resultscontrasting

confidence: 99%

Change in Mass and Damping on Vertically Vibrating Footbridges Due to Pedestrians

Georgakis

Jørgensen²

2013

Topics in Dynamics of Bridges, Volume 3

View full text Add to dashboard Cite

show abstract

“…In what may be described as 'pedestrian section model tests', Ingólfsson et al [23] measured such coefficients in a laboratory, putting single walkers on a treadmill on a moveable platform that could be put through prescribed harmonic displacements of differing amplitudes and frequencies. The approach is entirely analogous to the wind-tunnel section model tests of Scanlan's procedure.…”

Section: Forces Induced At the Structural Frequencymentioning

confidence: 99%

Parallels between wind and crowd loading of bridges

McRobie

Morgenthal

Abrams

et al. 2013

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

Parallels between the dynamic response of flexible bridges under the action of wind and under the forces induced by crowds allow each field to inform the other. Wind-induced behaviour has been traditionally classified into categories such as flutter, galloping, vortex-induced vibration and buffeting. However, computational advances such as the vortex particle method have led to a more general picture where effects may occur simultaneously and interact, such that the simple semantic demarcations break down. Similarly, the modelling of individual pedestrians has progressed the understanding of human–structure interaction, particularly for large-amplitude lateral oscillations under crowd loading. In this paper, guided by the interaction of flutter and vortex-induced vibration in wind engineering, a framework is presented, which allows various human–structure interaction effects to coexist and interact, thereby providing a possible synthesis of previously disparate experimental and theoretical results.

show abstract

“…Figure 10 presents the amplitude spectrum of the simulated and measured GRFs. In contrast to the perfectly periodic forces that are exclusively composed of the harmonics of the step frequency, the small variations in pacing rate result into a distribution of forces around the dominant harmonics 12,13 . By taking into account the identified variable pacing rate, these narrow band forces are also present in the simulated forces (Figure 10).…”

Section: Representative Resultsmentioning

confidence: 99%

Simulation of Human-induced Vibrations Based on the Characterized In-field Pedestrian Behavior

Nimmen

Lombaert

Roeck

et al. 2016

JoVE

View full text Add to dashboard Cite

For slender and lightweight structures, vibration serviceability is a matter of growing concern, often constituting the critical design requirement. With designs governed by the dynamic performance under human-induced loads, a strong demand exists for the verification and refinement of currently available load models. The present contribution uses a 3D inertial motion tracking technique for the characterization of the infield pedestrian behavior. The technique is first tested in laboratory experiments with simultaneous registration of the corresponding ground reaction forces. The experiments include walking persons as well as rhythmical human activities such as jumping and bobbing. It is shown that the registered motion allows for the identification of the time variant pacing rate of the activity. Together with the weight of the person and the application of generalized force models available in literature, the identified time-variant pacing rate allows to characterize the humaninduced loads. In addition, time synchronization among the wireless motion trackers allows identifying the synchronization rate among the participants. Subsequently, the technique is used on a real footbridge where both the motion of the persons and the induced structural vibrations are registered. It is shown how the characterized in-field pedestrian behavior can be applied to simulate the induced structural response. It is demonstrated that the in situ identified pacing rate and synchronization rate constitute an essential input for the simulation and verification of the human-induced loads. The main potential applications of the proposed methodology are the estimation of human-structure interaction phenomena and the development of suitable models for the correlation among pedestrians in real traffic conditions. Video LinkThe video component of this article can be found at

show abstract

Experimental identification of pedestrian-induced lateral forces on footbridges

Cited by 107 publications

References 19 publications

Change in Mass and Damping on Vertically Vibrating Footbridges Due to Pedestrians

Change in Mass and Damping on Vertically Vibrating Footbridges Due to Pedestrians

Parallels between wind and crowd loading of bridges

Simulation of Human-induced Vibrations Based on the Characterized In-field Pedestrian Behavior

Contact Info

Product

Resources

About