Stability of Cable-Stayed Bridge with Composite I-Girder Under Dynamic Wind Loads Using Computational Fluid Dynamics (CFD)
DOI:
https://doi.org/10.32832/astonjadro.v15i3.21590Keywords:
cable-stayed bridge, composite I-girder, CFD, stability parameter, wind load.Abstract
Cable-stayed bridges have emerged as a preferred solution for long-span crossings due to their efficient use of materials and visually appealing design. Nevertheless, their slender aerodynamic configuration renders them highly susceptible to dynamic wind effects such as flutter and vortex shedding, which may compromise serviceability and safety. This study formulates the problem by examining the aerodynamic stability of a composite I-girder cable-stayed bridge under varying wind speeds through the application of Computational Fluid Dynamics (CFD). The bridge deck, with a main span of 150 m, was modeled in three-dimensional solid form and subjected to wind speeds of 4, 8, 12, and 25 m/s. Modal analysis indicated that the torsional-to-bending frequency ratio (ft/fb) was 1.61, falling below the minimum requirement of 2.5 set by Indonesian Bridge and Road Guidelines No. 02/P/BM/2022, thereby justifying further aerodynamic assessment. The novelty of this research lies in integrating structural modal analysis with CFD-based simulations under site-specific wind conditions, providing insights rarely explored in regional contexts. Results demonstrated that the stability parameter fell within category A for 4 and 8 m/s, where wind effects were negligible, but shifted to category B at 12, 17.8, and 25 m/s, requiring attention to deck cross-section geometry. Vortex shedding patterns at 17.8 m/s were regular and consistent, indicating potential resonance, while flows became increasingly complex at 25 m/s, generating higher aerodynamic forces and turbulence energy. Maximum lateral displacements reached 425.6 mm and vertical displacements up to 388.6 mm at extreme wind speeds. In conclusion, CFD-based numerical analysis proved essential in identifying critical wind-induced responses, confirming its importance as a design-stage tool to ensure the long-term stability and reliability of cable-stayed bridges.
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