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-车流相互作用显著影响大跨桥梁的动力响应，然而现有分析常将两种荷载独立处理。本研究建立了风-车流同步作用模型，并证明其效应与线性叠加结果存在差异。根据交通量、组成及车辆动力学特性合成车流，将车辆视为三维系统。车-路相互作用采用具有横向相干性的ISO路面粗糙度模型，风湍流采用具有Davenport相干性的卡门谱。基于准定常气动模型实现联合作用下的时程分析。结果表明非线性相互作用改变了结构响应，揭示了传统设计假设的局限性。该框架可实现精确性能评估，为大跨桥梁的适用性指标制定及设计优化提供依据。