Coupling Vibration Response of Lightweight Aluminum Alloy Footbridges due to Synchronous Excitation of Low-Density Crowd
Publication: Journal of Performance of Constructed Facilities
Volume 38, Issue 5
Abstract
The vibration serviceability problems induced by the coupling vibration of lightweight footbridges is a research focus. Much research has been conducted in recent years, yet the attenuation of the coupling vibration subjected to a low-density crowd is still challenging. To investigate the coupling vibration between a moving crowd and aluminum alloy footbridge due to synchronous excitation, orthogonal crowd load tests were carried out on a simply supported aluminum alloy footbridge with a span of 34.8 m. Load tests with different numbers of pedestrians and step frequencies were conducted to obtain vibration frequency and peak acceleration of the footbridge. The comparative analysis reveals that vibration serviceability under certain conditions of synchronous excitation was not in accordance with German footbridges guidelines or British standards. Synchronous excitation of low-density crowds may lead to a marked decline in pedestrian comfort. A two degrees of freedom (TDOF) human dynamic model with a supporting mass of human body was applied to establish a crowd-footbridge coupling system. The numerical results are in agreement with experimental data, which validates the finite element model of the footbridge. Further numerical analysis was conducted to investigate the coupling vibration response of the footbridge subjected to low-density crowd below . The results show that the coupling effect is minor when the mass ratio is 0.12–0.3. When the mass ratio is 0.3–0.46, the coupling vibration is significant. Therefore, the coupling vibration of lightweight aluminum alloy footbridge deserves attention in design when subjected to low-density crowds. The evaluation of vibration serviceability is advised to be conducted according to the requirements of peak acceleration given in footbridge specifications.
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Data Availability Statement
All data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.
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Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 38 • Issue 5 • October 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Sep 2, 2023
Accepted: May 30, 2024
Published online: Aug 12, 2024
Published in print: Oct 1, 2024
Discussion open until: Jan 12, 2025
ASCE Technical Topics:
- Alloys
- Aluminum (material)
- Architectural engineering
- Bridge engineering
- Bridges
- Bridges (by type)
- Building management
- Continuum mechanics
- Coupling
- Dynamics (solid mechanics)
- Engineering materials (by type)
- Engineering mechanics
- Excitation (physics)
- Foot bridges
- Materials engineering
- Metals (material)
- Motion (dynamics)
- Oscillations
- Serviceability
- Solid mechanics
- Structural engineering
- Structural members
- Structural systems
- Vibration
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