Rapid deployment of a WSN on the Clifton Suspension Bridge, UK

Gunner, Sam; Vardanega, Paul J.; Tryfonas, Theo; Macdonald, John H G; Wilson, Roger

doi:10.1680/jsmic.17.00014

Cited by 7 publications

(8 citation statements)

References 20 publications

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“…Measurements at rod 11LW are used for analysis in this study, as they represent close approximates of the total modal responses of modes' L2 and L3. See reference [4] for full details on the structural health monitoring system used on the CSB.…”

Section: Methodsmentioning

confidence: 99%

Time-Frequency Analysis of Crowd Lateral Dynamic Forcing from Full-Scale Measurements on the Clifton Suspension Bridge

White

Alexander

Macdonald

2020

Conference Proceedings of the Society for Experimental Mechanics Series

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Pedestrian-induced vibrations have caused significant issues on various footbridges, over the past few decades, as it can lead to an abrupt growth in the amplitude of structural oscillations, i.e. lateral dynamic instability.Measurements were taken during two separate crowd loading events on the Clifton Suspension Bridge, UK, to characterise the human-structure interactions observed. Two lateral modes of the bridge were studied, previously found susceptible to pedestrian-induced excitation. A comparative study is performed to identify the different interactions observed for the differing bridge deck amplitude responses through a novel procedure based on timefrequency analysis. This enables the identification of the fluctuations on the instantaneous modal amplitude and

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Section: Methodsmentioning

confidence: 99%

Time-Frequency Analysis of Crowd Lateral Dynamic Forcing from Full-Scale Measurements on the Clifton Suspension Bridge

White

Alexander

Macdonald

2020

Conference Proceedings of the Society for Experimental Mechanics Series

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“…Rod 11LW, located 26.7m from the bridge midpoint, was previously identified by Macdonald [5] as a suitable point for motion measurement in all lateral vibration modes below 3Hz. Rod40LW was selected as it was believed that this would show the greatest vertical transient response from pedestrians exciting the suspended deck span [21]. The CSB is well documented and previous work carried out by both Macdonald [5] and Gunner et al [21] allowed for the efficient installation in one afternoon only requiring four people.…”

Section: Structural Health Monitoring (Shm) System and Data Acquisitionmentioning

confidence: 99%

Characterisation of crowd lateral dynamic forcing from full-scale measurements on the Clifton Suspension Bridge

et al. 2020

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Lateral loading of bridges by a crowd of walking pedestrians is of serious concern as it can lead to a sudden growth in the amplitude of structural oscillations, i.e. lateral dynamic instability. A vibration amplitude threshold, marking a qualitative change in pedestrians behaviour, is then usually proposed beyond which the likelihood of structural instability is said to increase. To verify this presumption, measurements were taken during a crowd loading event on Clifton Suspension Bridge in Bristol, UK.Two lateral modes of the bridge were studied, previously found susceptible to pedestrian-induced excitation. A novel procedure is proposed based on time-frequency analysis enabling, for the first time, the average equivalent added mass per pedestrian to be identified from measurements on a full-scale structure. Previous measurements on Clifton Suspension Bridge during crowd loading leading to the onset of large-amplitude vibrations revealed an increase in the natural frequency of one from the two considered modes. The proposed time-frequency analysis procedure has successfully identified the additional mass, due to the pedestrians, that is effectively negative. Cycle-by-cycle energy analysis per mode confirms the presence of additional damping of the pedestrians at low vibration amplitudes, that is also effectively negative. Although some of the results are uncertain quantitatively, there is no evidence of the amplitude threshold at which the human-structure interaction phenomenon occurs.

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“…Such a deployment mode is ideal for circumstances where low-cost, temporary and/or opportunistic monitoring may be required, such as e.g. in [13].…”

Section: A Deployment Of Real Time Civil Infrastructure Monitoringmentioning

confidence: 99%

Dynamic Cloud Service Management for Scalable Internet of Things Applications

Mavromatis

Gunner

Tryfonas

et al. 2019

2019 IEEE SmartWorld, Ubiquitous Intelligence &Amp; Computing, Advanced &Amp; Trusted Computing, Scalable Computing &Amp; Commu

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The Internet of Things (IoT) is growing rapidly and official reports suggest that soon it will become one of the key technologies of the Internet infrastructure. Cloud services are already integrated with IoT, providing solutions for a large number of applications. Various Cloud IoT platforms are available for IoT users, both as open source and commercial solutions. One of the important features of a cloud IoT platform is the management of services and the deployment time required to set up a platform dedicated to a specific IoT use case. This paper presents a cloud IoT platform deployment mechanism that aims to improve the deployment time between an IoT network and a cloud IoT platform. The approach is based on a platform descriptor which describes the IoT application requirements.Therefore, software-based functionalities automate the provisioning of the platform to accommodate scalability in cloud IoT applications. The experimentation and evaluation of the proposed mechanism is conducted over a real data-center laboratory. We are comparing our mechanism with a Unix bash shell scripting deployment method and the results achieve over 50% improvement in both platform deployment time, as well as the time required to update the platform.

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Rapid deployment of a WSN on the Clifton Suspension Bridge, UK

Cited by 7 publications

References 20 publications

Time-Frequency Analysis of Crowd Lateral Dynamic Forcing from Full-Scale Measurements on the Clifton Suspension Bridge

Time-Frequency Analysis of Crowd Lateral Dynamic Forcing from Full-Scale Measurements on the Clifton Suspension Bridge

Characterisation of crowd lateral dynamic forcing from full-scale measurements on the Clifton Suspension Bridge

Dynamic Cloud Service Management for Scalable Internet of Things Applications

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