Porous wind barriers (PWBs) are gradually applied to tunnel–bridge–tunnel infrastructures (TBTIs) along high-speed railway lines. Due to the remarkable aerodynamic effect of high-speed trains (HSTs), the windproof performance of a PWB at tunnel–bridge section (TBS) is particularly critical when a HST passes through the TBTI under crosswind. And it seems to be easily ignored by researchers. This study aims to determine the influence mechanism of the PWB in the TBS. A CFD dynamic model of air–train–PWB was built based on porous media theory, and its reliability is verified by model and field tests. The main results are as follows: the corresponding variation amplitudes of the train’s aerodynamic load coefficients are reduced by 36–95% when a PWB is set in the TBS; adopting the same design parameters along the full-length PWB on the TBTI is unreasonable; the PWB height and porosity in the TBS must be increased and reduced more than 33%, respectively, to achieve equivalent windproof performance. The conclusions in this paper can provide a preliminary idea for the optimization design of the PWB on the TBTI.

多孔防风罩（PWB）逐渐应用于高速铁路沿线的隧道，桥梁，隧道基础设施（TBTI）。由于高速列车（HST）的显着空气动力学效应，当HST在侧风下通过TBTI时，PWB在隧道-桥梁部分（TBS）的防风性能尤为关键。研究人员似乎很容易忽略它。这项研究旨在确定PWB在TBS中的影响机制。基于多孔介质理论，建立了航空-PWB的CFD动态模型，并通过模型和现场测试验证了其可靠性。主要结果如下：当在TBS中设置PWB时，火车的空气动力学负载系数的相应变化幅度减小了36–95％；在TBTI的全长PWB上采用相同的设计参数是不合理的；为了达到同等的防风性能，TBS中的PWB高度和孔隙率必须分别增加和减少超过33％。本文的结论可以为TBTI上PWB的优化设计提供一个初步的思路。