Influence of Low-Frequency Vertical Vibration on Walking Locomotion

Dang, Hiep Vu; Živanović, Stana

doi:10.1061/(asce)st.1943-541x.0001599

Cited by 33 publications

(30 citation statements)

References 19 publications

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“…Although the dynamic performance under high crowd densities is often imperative for the design, these loading conditions have virtually never been verified [4]. Concerns about these load models are strengthened by the fact that recent studies indicate the significant impact of human-structure interaction (HSI) phenomena [5][6][7][8][9]. However, large-scale experimental evidence corroborating these results is absent.…”

Section: Introductionmentioning

confidence: 99%

“…As direct force measurements are in this case practically infeasible, indirect force measurements, where the input is reconstructed from registered body motion, constitute an interesting alternative. Promising results have been obtained for the reconstruction of the ground reaction forces (GRFs) induced by walking, bobbing and jumping, generally using visual marker data [8,[11][12][13] and in some cases using inertial sensors [14][15][16][17][18][19]. In [12], Racić et al apply Newton's second law of motion and the vertical accelerations at the centre of mass (CoM) of 15 body segments, in order to reconstruct human bouncing and jumping forces.…”

Section: Introductionmentioning

confidence: 99%

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A Robust Methodology for the Reconstruction of the Vertical Pedestrian-Induced Load from the Registered Body Motion

et al. 2018

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This paper proposes a methodology to reconstruct the vertical GRFs from the registered body motion that is reasonably robust against measurement noise. The vertical GRFs are reconstructed from the experimentally identified time-variant pacing rate and a generalised single-step load model available in the literature. The proposed methodology only requires accurately capturing the body motion within the frequency range 1–10 Hz and does not rely on the exact magnitude of the registered signal. The methodology can therefore also be applied when low-cost sensors are used and to minimize the impact of soft-tissue artefacts. In addition, the proposed procedure can be applied regardless of the position of the sensor on the human body, as long as the recorded body motion allows for identifying the time of a nominally identical event in successive walking cycles. The methodology is illustrated by a numerical example and applied to an experimental dataset where the ground reaction forces and the body motion were registered simultaneously. The results show that the proposed methodology allows for arriving at a good estimate of the vertical ground reaction forces. When the impact of soft-tissue artefacts is low, a comparable estimate can be obtained using Newton’s second law of motion.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Robust Methodology for the Reconstruction of the Vertical Pedestrian-Induced Load from the Registered Body Motion

et al. 2018

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“…In residential occupancies, the thresholds of vibrations are determined by a seated person rather than one that is standing or in motion (Onysko et al, 2000). More recently, Dang and Ž ivanovic´(2016) found that the vibration perception of a pedestrian is one to two orders of magnitude greater than that typical of a standing person, and complaint thresholds also increase as the speed of walking increases. Some other experimental studies on pedestrian perception of human-induced vibration were reported in Ma et al (2018).…”

Section: Moving and Stationary Damped-oscillatorsmentioning

confidence: 99%

Human-induced vibration of cold-formed steel floor systems: Parametric studies

Zhang

2020

Advances in Structural Engineering

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Designing a lightweight floor to prevent annoying vibrations induced by human activities is still a challenge because numerous factors need to be considered. In consequence, there is still a lack of reliable models and adequate design guidelines pertinent to the vibration serviceability of cold-formed steel floor systems. To facilitate understanding the fundamental concepts of lightweight floor vibrations for serviceability design, a newly proposed damped plate-oscillator model was adopted in this research to predict dynamic responses of cold-formed steel floors induced by human walking. Three loading methods were developed based on this model. By using these loading methods, comprehensive parametric studies involving step frequencies, mass ratios, damping ratios, walking paths and end-support restraints were conducted. The present analytical studies show that the influence of moving or stationary occupants depends on the mass ratio of occupants to the floor and its significance could be negligible for small mass ratios. In addition, the boundary restraints at floor end-supports may not always reduce floor responses. On the contrary, relatively larger responses could be excited by human walking for the restrained floors having the fundamental frequency close to the multiple of the footstep frequency.

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“…The bridge mass is approximately 16500 kg, and the modal mass of the first bending mode is 7614 kg with natural frequency of about 2.43 Hz [39]. As a unique facility, it has already been used considerably for the study of human-induced vibration [23]. Five test subjects (4 male, 1 female), weighing from 543 N to 1117 N participated in the experiments.…”

Section: Walking Trialsmentioning

confidence: 99%

“…Van Nimmen et al [21] and Bocian et al [22] indirectly reconstructed vertical walking force on bridge surfaces from inertial motion tracking and a single point inertial measurement respectively. To the authors' knowledge, Dang and Zivanovic [23] is the only experimental work on direct measurement of walking GRFs on lively structures in the vertical direction. The results showed a drop in the first dynamic load factor of the walking force due to the bridge vibration at the resonance.…”

Section: Introductionmentioning

confidence: 99%