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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Structural Modeling to Predict the Vibrations of a Footbridge Due to Pedestrian Movements
Two major footbridge failures were reported during the nineteenth century when soldiers marched over them in unison. They resulted in large number of casualties. Even though modern footbridges are not generally in danger of failure due to such activities, they can be susceptible to vibrations when pedestrians move across them. These can become excessively large if people walk or march in unison at the footbridge resonance frequency or its subharmonics. The vibration serviceability issue of the Millennium Bridge over the Thames River in London is a well-known example of such problems. Therefore, it is essential for the structural designer to be able to predict the vibration response of the footbridge due to pedestrian movements with an acceptable accuracy. This paper details the vibration testing and computer modeling of a footbridge. The computer model has been updated to accurately represent the structure. The footbridge vibrations due to the movements of various groups of people at the subharmonics of its resonance frequency were measured. The computer model was then subjected to human footfall forces and the predicted responses were compared with those from the measurements. It is known that the human-structure interactions (HSI) can affect the predicted response of footbridges. However, the incorporation of HSI into a computer model is generally a complex process. By equating the computed and measured Vibration Dose Value (VDV), equivalent damping ratios of the structure due to the HSI effects were found which showed an almost linear increase with the number of the pedestrians.
Structural Modeling to Predict the Vibrations of a Footbridge Due to Pedestrian Movements
Two major footbridge failures were reported during the nineteenth century when soldiers marched over them in unison. They resulted in large number of casualties. Even though modern footbridges are not generally in danger of failure due to such activities, they can be susceptible to vibrations when pedestrians move across them. These can become excessively large if people walk or march in unison at the footbridge resonance frequency or its subharmonics. The vibration serviceability issue of the Millennium Bridge over the Thames River in London is a well-known example of such problems. Therefore, it is essential for the structural designer to be able to predict the vibration response of the footbridge due to pedestrian movements with an acceptable accuracy. This paper details the vibration testing and computer modeling of a footbridge. The computer model has been updated to accurately represent the structure. The footbridge vibrations due to the movements of various groups of people at the subharmonics of its resonance frequency were measured. The computer model was then subjected to human footfall forces and the predicted responses were compared with those from the measurements. It is known that the human-structure interactions (HSI) can affect the predicted response of footbridges. However, the incorporation of HSI into a computer model is generally a complex process. By equating the computed and measured Vibration Dose Value (VDV), equivalent damping ratios of the structure due to the HSI effects were found which showed an almost linear increase with the number of the pedestrians.
Structural Modeling to Predict the Vibrations of a Footbridge Due to Pedestrian Movements
Lecture Notes in Civil Engineering
Wu, Zhishen (Herausgeber:in) / Nagayama, Tomonori (Herausgeber:in) / Dang, Ji (Herausgeber:in) / Astroza, Rodrigo (Herausgeber:in) / Setareh, Mehdi (Autor:in) / Bukhari, Mohammad (Autor:in)
Experimental Vibration Analysis for Civil Engineering Structures ; Kapitel: 22 ; 247-256
24.08.2022
10 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Footbridge dynamic response , Human-structure interaction (HSI) , Structural modeling , Ground reaction force (GRF) , Vibration dose value (VDV) Engineering , Civil Engineering , Vibration, Dynamical Systems, Control , Mechanical Engineering , Structural Materials , Cyber-physical systems, IoT , Professional Computing
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