Ergonomic Evaluation Methods for Bridge Vibrations

Kobori, Tameo; Kajikawa, Yasuo

doi:10.2208/jscej1969.1974.230_23

Cited by 10 publications

(7 citation statements)

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“…It is interesting that in some of Smith's tests, when the resonant build up of vibration was achieved, some subjects were afraid. Kobori and Kajikawa [135] conducted experiments similar to Leonard's tests, with 11 walking subjects on a vertically vibrating shaking platform driven by a sinusoidal force in the frequency range 1-10 Hz. It was found that the vibration velocity is the main parameter which influenced the human perception.…”

Section: Perception Of Vertical Vibrations On Bridgesmentioning

confidence: 99%

“…18. Unfortunately, none of these two articles [135] and [136] contains a list of pertinent references which could help to understand better the approach proposed. It should be noted that velocity is adopted as the parameter for evaluation of footbridge serviceability in Japan [55].…”

Section: Perception Of Vertical Vibrations On Bridgesmentioning

confidence: 99%

“…Pimentel [58] compared vibration limits given in BS 5400 [74], Ontario Code [141], Kobori and Kajikawa [135] and ISO 10137 [27] related to footbridges. They are presented in Fig.…”

Section: Perception Of Vertical Vibrations On Bridgesmentioning

confidence: 99%

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Vibration serviceability of footbridges under human-induced excitation: a literature review

Živanović

Pavić

Reynolds

2005

Journal of Sound and Vibration

522

315

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Increasing strength of new structural materials and longer spans of new footbridges, accompanied with aesthetic requirements for greater slenderness, are resulting in more lively footbridge structures. In the past few years this issue attracted great public attention. The excessive lateral sway motion caused by crowd walking across the infamous Millennium Bridge in London is the prime example of the vibration serviceability problem of footbridges. In principle, consideration of footbridge vibration serviceability requires a characterisation of the vibration source, path and receiver. This paper is the most comprehensive review published to date of about 200 references which deal with these three key issues.The literature survey identified humans as the most important source of vibration for footbridges. However, modelling of the crowd-induced dynamic force is not clearly defined yet, despite some serious attempts to tackle this issue in the last few years.The vibration path is the mass, damping and stiffness of the footbridge. Of these, damping is the most uncertain but extremely important parameter as the resonant behaviour tends to govern vibration serviceability of footbridges.A typical receiver of footbridge vibrations is a pedestrian who is quite often the source of vibrations as well. Many scales for rating the human perception of vibrations have been found in the published literature. However, few are applicable to footbridges because a receiver is not stationary but is actually moving across the vibrating structure.During footbridge vibration, especially under crowd load, it seems that some form of humanstructure interaction occurs. The problem of influence of walking people on footbridge vibration properties, such as the natural frequency and damping is not well understood, let alone quantified.Finally, there is not a single national or international design guidance which covers all aspects of the problem comprehensively and some form of their combination with other published information is prudent when designing major footbridge structures. The overdue update of the current codes to reflect the recent research achievements is a great challenge for the next 5-10 years. Abbreviations:ASD-auto spectral density; DLF-dynamic load factor; DOF-degree of freedom; FE-finite element;FRF-frequency response function; MDOF-multiple-degree-of-freedom;MTMD-multiple tuned mass damper; RMS-root-mean-square;SDOF-single-degree-of-freedom; TLD-tuned liquid damper; TMD-tuned mass damperThis paper has been published under the following reference:Živanović, S., Vibration serviceability of footbridges under human-induced excitation: a literature review.

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Section: Perception Of Vertical Vibrations On Bridgesmentioning

confidence: 99%

Section: Perception Of Vertical Vibrations On Bridgesmentioning

confidence: 99%

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Vibration serviceability of footbridges under human-induced excitation: a literature review

Živanović

Pavić

Reynolds

2005

Journal of Sound and Vibration

522

315

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“…Actuators 2018, 7, x FOR PEER REVIEW 3 of 13 composite vibration obtained [11] by superimposing a plurality of vibrations having different frequency characteristics, evaluation of psychological characteristics based on physiological measurement has not been performed; it is necessary to verify this experimentally. Based on the above contents, in this paper, as a fundamental study on masking, we verified its effect using the Vibration Test by simulating the vibration environment applying the masking.…”

Section: Masking Methodsmentioning

confidence: 99%

“…In this study, we propose a method of masking which relatively reduces the sensitivity of undesirable vibrations by aggressively inputting vibrations of other frequencies against the vibration of frequencies which is input as disturbance and is perceived as discomfort. Conversely, though the evaluation of physical characteristics and comfort by sensory evaluation has been performed on composite vibration obtained [11] by superimposing a plurality of vibrations having different frequency characteristics, evaluation of psychological characteristics based on physiological measurement has not been performed; it is necessary to verify this experimentally.…”

Section: Introductionmentioning

confidence: 99%

Ride Comfort Control System Considering Physiological and Psychological Characteristics: Effect of Masking on Vertical Vibration on Passengers

et al. 2018

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Active seat suspension has been proposed to improve ride comfort for ultra-compact mobility. Regarding the ride comfort of passengers due to vertical vibration, the authors have confirmed from biometry measurements that reduction of the vibration acceleration does not always produce the best ride comfort for passengers. Therefore, heart rate variability that can quantitatively reflect stress is measured in real time, and a control method was proposed that feeds back to active suspension and confirms its effectiveness by fundamental verification. In this paper, we will confirm the influence of the vibration stress on the psychological state of the occupant by the masking method.

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Serviceability of stress ribbon bridges with external tendons

Fukada¹,

Yoshikawa²,

Tsunomoto³

2015

Proceedings of the Institution of Civil Engineers - Bridge Engi

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A prestressed concrete stress ribbon footbridge is a type of suspension bridge without towers. A conventional stress ribbon footbridge has two types of tendons in the concrete deck: the internal prestressing tendons (secondary tendons) and suspension tendons (primary tendons), which carry the dead load. This study targeted two footbridges with common structures that efficiently arrange the external tendons to reduce the construction cost and match the surrounding landscape. The Morino-Wakuwaku Bridge has the suspension tendons (primary tendons) in the concrete deck, and the prestressing tendons (secondary tendons) are placed outside of the deck as the external tendons. TheOhmaki-Dondo Bridge has external tendons (primary and secondary tendons) and bearings. These bridges differ in their structural and vibrational characteristics. Static loading tests using a vehicle, vibration tests using humans and finite-element method simulations were carried out to understand the characteristics of each bridge. This paper describes the structural and vibrational characteristics of prestressed concrete stress ribbon footbridges with external tendons and estimates their vibration serviceability performance for pedestrians based on the analysis and test results.

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Ergonomic Evaluation Methods for Bridge Vibrations

Cited by 10 publications

References 0 publications

Vibration serviceability of footbridges under human-induced excitation: a literature review

Vibration serviceability of footbridges under human-induced excitation: a literature review

Ride Comfort Control System Considering Physiological and Psychological Characteristics: Effect of Masking on Vertical Vibration on Passengers

Serviceability of stress ribbon bridges with external tendons

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