Wind-traffic interactions strongly influence the dynamic response of long-span bridges, yet loads are often analysed independently. This work models concurrent wind and traffic and demonstrates that it differs from linear superposition. Traffic is synthesised from volumes, composition, and vehicle dynamics, with vehicles represented as 3D systems. Vehicle-pavement interaction adopts ISO roughness with transverse coherence, and wind turbulence follows the Kármán spectrum with Davenport coherence. A quasi-steady aerodynamic model supports time-history analysis under combined actions. Results indicate non-linear interactions that change response, revealing limitations of conventional design assumptions. The framework enables accurate performance assessment and informs serviceability criteria and design optimisation for long-span bridges.

翻译：风-交通相互作用显著影响大跨度桥梁的动态响应，但相关荷载通常被独立分析。本研究对风与交通的并发作用进行建模，并证明其与线性叠加存在差异。交通流基于交通量、组成及车辆动力学综合生成，车辆被构建为三维系统。车辆-路面相互作用采用具有横向相干性的ISO路面粗糙度模型，风湍流遵循采用达文波特相干性的卡门谱。基于准定常气动模型，支持在联合作用下的时程分析。结果表明，非线性相互作用会改变结构响应，揭示了传统设计假设的局限性。该框架可实现准确的性能评估，并为大跨度桥梁的适用性准则与设计优化提供依据。