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Vertical ground reaction forces on rigid and vibrating surfaces for vibration serviceability assessment of structures
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Ahmadi, Ehsan, Caprani, Colin, Živanović, Stana and Heidarpour, Amin (2018) Vertical ground reaction forces on rigid and vibrating surfaces for vibration serviceability assessment of structures. Engineering Structures, 172 . pp. 723-738. doi:10.1016/j.engstruct.2018.06.059 ISSN 1873-7323.
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WRAP-vertical-ground-reaction-forces-rigid-vibrating-surfaces-vibration-serviceability-assessment-Živanović.pdf - Accepted Version - Requires a PDF viewer. Download (1805Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.engstruct.2018.06.059
Abstract
Lightweight structures are sensitive to dynamic force generated by human walking and consequently can exhibit excessive vibration responses. The imparted forces, known as ground reaction forces (GRFs), are a key input in the vibration serviceability assessment of footbridges. Most GRF measurements have been conducted on rigid surfaces such as instrumented treadmills and force plates mounted on strong floors. However, it is thought that the vibrating surface of a footbridge might affect the imparted human force. This paper introduces a unique laboratory experimental setup to investigate vertical GRFs on both rigid surface (strong floor) and a higher-frequency flexible surface (footbridge). 810 walking trials were performed by 18 test subjects walking at different pacing frequencies. For each trial, test subjects travelled a circuit of a vibrating footbridge surface followed by a rigid surface. A novel data collection setup was adopted to record the vertical component of GRFs, and the footbridge vibration response during each trial. Frequency-domain analysis of both single-step and continuous GRFs was then performed. The results show that the footbridge vibration affects GRFs, and changes GRF magnitudes for harmonics in resonance with the footbridge vibration (up to around 30% reduction in the dynamic load factor of the third harmonic). This finding, and the measured GRFs, can be used for more accurate vibration serviceability assessments of existing and new footbridges.
Item Type: | Journal Article | ||||||||||||
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Subjects: | T Technology > TG Bridge engineering | ||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||||||
Library of Congress Subject Headings (LCSH): | Footbridges -- Design and construction, Ground reaction force (Biomechanics), Vibration -- Measurment | ||||||||||||
Journal or Publication Title: | Engineering Structures | ||||||||||||
Publisher: | Elsevier Science Ltd. | ||||||||||||
ISSN: | 1873-7323 | ||||||||||||
Official Date: | 1 October 2018 | ||||||||||||
Dates: |
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Volume: | 172 | ||||||||||||
Page Range: | pp. 723-738 | ||||||||||||
DOI: | 10.1016/j.engstruct.2018.06.059 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
Date of first compliant deposit: | 27 June 2018 | ||||||||||||
Date of first compliant Open Access: | 22 June 2019 | ||||||||||||
RIOXX Funder/Project Grant: |
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