Dynamic Response of Suspension Bridges Due to Coupling Between Buffeting and Aeroelastic Flutter
Hafid Mataich1, Bouchta El Amrani2
1Hafid Mataich, Laboratory of Mathematics, Modeling and Applied Physics, Higher Normal School, Sidi Mohamed Ben Abdellah University, Fez, Morocco.
2Prof. Bouchta El Amrani, Laboratory of Mathematics, Modeling and Applied Physics, Higher Normal School, Sidi Mohamed Ben Abdellah University, Fez, Morocco.
Manuscript received on 24 August 2024 | First Revised Manuscript received on 26 December 2024 | Second Revised Manuscript received on 03 January 2025 | Manuscript Accepted on 15 January 2025 | Manuscript published on 30 January 2025 | PP: 30-39 | Volume-13 Issue-2, January 2025 | Retrieval Number: 100.1/ijese.K997413111024 | DOI: 10.35940/ijese.K9974.13020125
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: The effects of turbulent winds on suspension bridges are considerable, significantly influencing the bridge’s floating instability and, as a result, its safety and performance. Predicting the coupled response of buffeting and flutter in suspension bridges is an advanced area of structural and aeroelastic engineering. Buffeting and flutter are not independent phenomena; buffeting, by exciting specific natural frequencies of the bridge, can contribute to the onset of flutter. Furthermore, once flutter is triggered, it alters the dynamics of the bridge, potentially amplifying the effects of buffeting. The interaction between these two phenomena can lead to complex dynamic responses that are challenging to predict through separate analyses. This paper explores this phenomenon in the time domain, requiring the expression of aerodynamic forces via convolution integrals, which incorporate the aerodynamic impulse function, structural motions, and wind fluctuations. We analyzed the aerodynamic response of the old Tacoma Bridge in the USA, situated on complex terrain and subjected to turbulent winds. A formulation that accounts for the lateral, vertical, and torsional motions of the bridge deck structure was used. The Beta-Newmark numerical algorithm was employed to integrate the bridge’s time response. Subsequently, parametric studies were conducted to further elucidate the concepts of buffeting-flutter coupling in long-span suspension bridges, aiming to assist designers in developing effective control protocols.
Keywords: Suspension Bridge; Aeroelastic Instability; Wind Turbulence; Buffeting; Flutter.
Scope of the Article: Civil Engineering and Applications