CFD Analysis for Wind Load Assessment

In modern times, bridge designs are tending towards longer and slender configurations, presenting new challenges to ensure their stability and resistance. This research focuses on the effects of wind-induced vibrations in the context of long, slender arch bridges, with particular reference to the recently constructed Bomarsunds Bridge between two islands in Finland. The primary goal of this study is to comprehensively analyze the dynamic behavior of the bridge under wind loading, as wind-induced vibrations pose potential risks to its safety and structural integrity. The slender hangers of the bridge, especially within the central span, have exhibited significant vibrations, necessitating an in-depth investigation to understand the bridge’s response to wind forces. Computational fluid dynamics (CFD) simulations were performed using Ansys Fluent to design a more accurate wind load acting on the structure. The CFD analysis provides essential parameters such as aerodynamic coefficients and Strouhal number and other information describing the behaviour of a given section subjected to a wind flow. The study in question focuses on the rectangular hollow steel section representative of hangers and how its design influences the simulation results. By integrating advanced computer simulations and CFD analysis, the research addresses the complex challenges posed by fluid-dynamic phenomena, including shedding problems, which are critical to understanding and mitigating vibration hazards in bridges. The results of this study provide an in-depth view of the wind load on the structure and allow the dynamic behaviour of long and narrow arch bridges to be determined. By analysing the complex interactions between the bridge and wind forces, the study contributes valuable insights into the field of wind engineering. Ultimately, this research plays a key role in ongoing efforts to design robust, safe and resilient bridge structures that can effectively resist wind-induced vibration and ensure the safety of the infrastructure.