Effects of combined-type wind barriers on the aerodynamic characteristics of train–bridge system for a long-span suspension bridge.

This article focuses on evaluating the aerodynamic performance and windproofing effectiveness of a newly proposed combined-type wind barrier for high-speed trains running on bridges under crosswind conditions. Through wind tunnel tests comparing three wind barrier types—open hole-type, fence-type, and the combined-type—the study finds that the combined-type wind barrier achieves the greatest reduction in train drag coefficient (up to 97.21% at 4 m height and 19% ventilation rate) while also improving the aerodynamic characteristics of the bridge compared to traditional barriers. The combined-type barrier's design, featuring upper wind-guiding blades and a lower perforated plate, effectively guides and blocks airflow, reducing both mean and fluctuating wind pressures on the train surface and providing a more uniform pressure distribution. These findings suggest that the combined-type wind barrier offers a more efficient and practical solution for enhancing the safety and stability of high-speed trains operating on bridges exposed to crosswinds.