Assessment of dynamic properties of a crowd model for human–structure interaction modeling

Salyards, Kelly A.; Hua, Yue

doi:10.1016/j.engstruct.2015.01.016

Cited by 32 publications

(13 citation statements)

References 9 publications

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“…The values by Zivanovic et al [16] were extracted from measured acceleration responses of a laboratory footbridge structure at the University of Sheffield due to groups of two to 10 people walking. The data of Salyards and Hua [65] correspond to studies with groups of one to 19 people standing with bent knees on a laboratory floor structure. The values obtained from the numerical simulations carried out in this study are in line with those experimentally measured.…”

Section: Cpfsmentioning

confidence: 96%

Modelling framework for dynamic interaction between multiple pedestrians and vertical vibrations of footbridges

Venuti

Racić

Corbetta

2016

Journal of Sound and Vibration

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After 15 years of active research on the interaction between moving people and civil engineering structures, there is still a lack of reliable models and adequate design guidelines pertinent to vibration serviceability of footbridges due to multiple pedestrians. There are three key issues that a new generation of models should urgently address: pedestrian “intelligent” interaction with the surrounding people and environment, effect of human bodies on dynamic properties of unoccupied structure and inter-subject and intra-subject variability of pedestrian walking loads. This paper presents a modelling framework of human–structure interaction in the vertical direction which addresses all three issues. The framework comprises two main models: (1) a microscopic model of multiple pedestrian traffic that simulates time varying position and velocity of each individual pedestrian on the footbridge deck, and (2) a coupled dynamic model of a footbridge and multiple walking pedestrians. The footbridge is modelled as a SDOF system having the dynamic properties of the unoccupied structure. Each walking pedestrian in a group or crowd is modelled as a SDOF system with an adjacent stochastic vertical force that moves along the footbridge following the trajectory and the gait pattern simulated by the microscopic model of pedestrian traffic. Performance of the suggested modelling framework is illustrated by a series of simulated vibration responses of a virtual footbridge due to light, medium and dense pedestrian traffic. Moreover, the Weibull distribution is shown to fit well the probability density function of the local peaks in the acceleration response. Considering the inherent randomness of the crowd, this makes it possible to determine the probability of exceeding any given acceleration value of the occupied bridge

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Section: Cpfsmentioning

confidence: 96%

Modelling framework for dynamic interaction between multiple pedestrians and vertical vibrations of footbridges

Venuti

Racić

Corbetta

2016

Journal of Sound and Vibration

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“…Resonance happens when the frequency of human activity approaches the floor fundamental frequency [8,9]. Excessive vibration makes people feel uncomfortable or even panic [10]. Once the vibration serviceability problem occurs, the maintenance cost is huge [11].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Analytical Study on the Vibration Performance of U-Shaped Steel-Concrete Composite Hollow Waffle Slab

Zhang

Wang²,

Wang³

et al. 2020

Shock and Vibration

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e large-span floor system being lightweight with low frequency and low damping is prone to suffer severe vibration under human excitations. In this research, the vibration performance of an innovative large-span U-shaped steel-concrete composite hollow waffle (CHW) slab was studied based on field testing and theoretical analysis. First, the modal properties of CHW slab including mode shapes, frequencies, and damping ratio were captured by on-site tests and validated by the finite element method, indicating the CHW slab is a low-frequency floor system with a low damping ratio. Second, the vibration responses of CHW slab under heel-drop and jumping excitations were studied considering the impacts of spatial position, tester number, and activity types. ird, the CHW slab shows excellent vibration serviceability proved by the frequency, accelerations, and human perceptions threshold with the current codes. Meanwhile, the paper gives appropriate threshold values for the CHW slab under impulsive excitation. Finally, the natural frequency formula for the CHW slab derived by the Rayleigh-Ritz energy method agrees well with the measurements.

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“…From the early 2000s onwards, researchers have paid attention to the effect of passive persons (these do not act as an external dynamic force applied onto the structural system) acting in different postures as sitting, standing and bent knees . Regarding the active persons, most of these studies have drawn attention to walking on footbridges and bobbing/bouncing loads on grandstands .…”

Section: Introductionmentioning

confidence: 99%

Active human‐structure interaction during jumping on floors

Gaspar

Caetano

Moutinho

et al. 2019

Struct Control Health Monit

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The study of the human-structure interaction (HSI) using biodynamics models has gained attention lately. Several studies have demonstrated that the passive (standing still) and active (bobbing/bouncing or walking) persons can act for the benefit of the structural system by considering their body dynamic properties. Nevertheless, little concern has been addressed regarding the HSI during jumping loads on floors. This kind of human load is often considered as a "force-only" model by design guides, and the body dynamics is disregarded.Therefore, aiming at filling this gap, this work investigates experimental and numerically an individual jumping on a vibrating (flexible) floor mounted in the laboratory. The active HSI was evaluated considering both single and two degree of freedom models in time and frequency domains. Besides, the assessment of the human body dynamic parameters (spring, mass and damper) was carried out based on optimisation techniques. The results show the potential benefit of taking into account the active HSI in near-resonant cases to the detriment of a force-only model.

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Assessment of dynamic properties of a crowd model for human–structure interaction modeling

Cited by 32 publications

References 9 publications

Modelling framework for dynamic interaction between multiple pedestrians and vertical vibrations of footbridges

Modelling framework for dynamic interaction between multiple pedestrians and vertical vibrations of footbridges

Experimental and Analytical Study on the Vibration Performance of U-Shaped Steel-Concrete Composite Hollow Waffle Slab

Active human‐structure interaction during jumping on floors

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