Numerical study of the unsteady crosswind response of high-speed train under local structure-induced unsteady winds by MBS. (15th April 2023)

• Record Type: Journal Article
• Authors: Zhang, Dongqin; Zhong, Mu; Hu, Gang; Xiao, Yiqing
• Is Part Of: Engineering structures. Volume 281(2023)
• Publication Date: 2023-04-15
• Subjects: DAF -- Dynamic response -- High-speed train -- Local structure-induced unsteady winds -- MBS; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2023.115788
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: A framework to evaluate dynamic responses of a high-speed train under local structure-induced unsteady winds is proposed. The DAF is used to quantitatively evaluate the dynamic amplification effect of local structure-induced unsteady winds on a high-speed train. The DAF increases linearly in tunnel exit winds and step-type gust winds while it increases initially and then decrease afterwards in impulse-type gust winds. A simple method to evaluate CWCs of the high-speed train under local structure-induced unsteady winds is proposed. Abstract: Unsteady winds induced by structures installed along railway lines pose a threat to train safety, since they generally amplify the unsteady crosswind response. In this study, the dynamic amplification factor (DAF) and characteristic wind curves (CWCs) of a high-speed train under local structure-induced unsteady winds, such as tunnel exit winds, impulse-type gust winds, and step-type gust winds, are studied by using multibody simulations (MBS). First, a 42 DoFs train model is built and verified by numerical simulation results. Second, the DAF of a high-speed train under unsteady wind scenarios is calculated, and it is obvious as the passing time becomes smaller than 2.5 s . A linear increase of the DAF is observed when the high-speed train is subjected to tunnel exit winds or step-type gust winds. While the DAF increases initially, afterwards it decreases as the passing time decreases for impulse-type gust winds. Finally, a simple method to evaluate CWCs of the high-speed train under local structure-induced unsteady winds is proposed using the DAF. In summary, it helps to investigate the wind-induced overturning risk of a high-speed train when passing through the special route in the strong windy areas and to provide the operation control method.