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Article

A Study on Post-Flutter Characteristics of a Large-Span Double-Deck Steel Truss Main Girder Suspension Bridge

1
School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China
2
Department of Bridge Engineering, Southeast University, Nanjing 210092, China
*
Author to whom correspondence should be addressed.
Buildings 2024, 14(10), 3206; https://doi.org/10.3390/buildings14103206
Submission received: 5 September 2024 / Revised: 6 October 2024 / Accepted: 7 October 2024 / Published: 9 October 2024
(This article belongs to the Special Issue Wind Load Effects on High-Rise and Long-Span Structures: 2nd Edition)

Abstract

To investigate the nonlinear flutter characteristics of long-span suspension bridges under different deck ancillary structures and configurations, including those with and without a central wind-permeable zone, as well as to analyze the hysteresis phenomenon of a subcritical flutter and elucidate the mechanisms leading to the occurrence of nonlinear flutter, this paper studies first the post-flutter characteristics of the torsion single-degree-of-freedom (SDOF) test systems and vertical bending–torsion two-degree-of-freedom (2DOF) test systems under different aerodynamic shape conditions are further analyzed, and the role of the vertical vibration in coupled nonlinear flutter is discussed. The results indicate that better flutter performance is achieved in the absence of bridge deck auxiliary structures with a central wind-permeable zone. The participation of vertical vibrations in the post-flutter vibration increases with the increase in wind speed, reducing the flutter performance of the main girder. Furthermore, the hysteresis phenomenon in the subcritical flutter state is observed in the wind tunnel experiment, and its evolution law and mechanism are discussed from the perspective of amplitude-dependent damping. Finally, the vibration-generating mechanism of the limit oscillation ring is elaborated in terms of the evolution law of the post-flutter vibration damping.
Keywords: double-deck steel truss; aerodynamic shape; wind tunnel test; aeroelastic flutter; amplitude-dependent damping double-deck steel truss; aerodynamic shape; wind tunnel test; aeroelastic flutter; amplitude-dependent damping

Share and Cite

MDPI and ACS Style

Li, C.; Zou, M.; Li, K.; Han, Y.; Yan, H.; Cai, C. A Study on Post-Flutter Characteristics of a Large-Span Double-Deck Steel Truss Main Girder Suspension Bridge. Buildings 2024, 14, 3206. https://doi.org/10.3390/buildings14103206

AMA Style

Li C, Zou M, Li K, Han Y, Yan H, Cai C. A Study on Post-Flutter Characteristics of a Large-Span Double-Deck Steel Truss Main Girder Suspension Bridge. Buildings. 2024; 14(10):3206. https://doi.org/10.3390/buildings14103206

Chicago/Turabian Style

Li, Chunguang, Minhao Zou, Kai Li, Yan Han, Hubin Yan, and Chunsheng Cai. 2024. "A Study on Post-Flutter Characteristics of a Large-Span Double-Deck Steel Truss Main Girder Suspension Bridge" Buildings 14, no. 10: 3206. https://doi.org/10.3390/buildings14103206

APA Style

Li, C., Zou, M., Li, K., Han, Y., Yan, H., & Cai, C. (2024). A Study on Post-Flutter Characteristics of a Large-Span Double-Deck Steel Truss Main Girder Suspension Bridge. Buildings, 14(10), 3206. https://doi.org/10.3390/buildings14103206

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