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Structural dynamic responses evaluation of pedestrian bridge under effect of aerodynamic disturbance of high-speed train
International Journal of Numerical Methods for Heat & Fluid Flow ( IF 4.0 ) Pub Date : 2024-11-26 , DOI: 10.1108/hff-08-2024-0563
Jiawang Zeng, Ming-Zhi Yang, Lei Zhang, Tongtong Lin, Sha Zhong, Yu Tao

Purpose

The aerodynamic load caused by high-speed train operation may lead to severe vibration of the pedestrian bridge, thus causing great safety hazards. Therefore, this study aims to investigate the aerodynamic loading characteristics of a pedestrian bridge when a high-speed train passes over the bridge, as well as to evaluate the vibration response of the aerodynamic loads on the bridge structure.

Design/methodology/approach

High-speed trains are operated at three different speeds. The aerodynamic pressure load characteristics of high-speed trains crossing a pedestrian bridge are investigated by combining a nonconstant numerical simulation method with a dynamic modeling test method, and the vibration response of the bridge is analyzed.

Findings

The results show that when a high-speed train passes through the pedestrian bridge, the pedestrian bridge interferes with the attenuation of the pressure around the train, so that the pressure spreads along the bridge bottom, and the maximum positive and negative pressure peaks appear in the center area of the bridge bottom, while the pressure fluctuations in the bridge entrance and exit areas are smaller and change more slowly, and the pressure attenuation of the bridge bottom perpendicular to the direction of the train’s operation is faster. In addition, the pressure fluctuation generated by the high-speed train will lead to a larger vertical response of the bridge structure in the mid-span position, and the main vibration frequency of the bridge structure ranges from 8 to 10 Hz, and the maximum value of the vertical deformation amplitude is located in the mid-span region of the bridge.

Originality/value

This paper analyzes the flow field distribution around the train and at the bottom of the bridge for the evolution of the flow field when the train passes through the bridge at high speed, and conducts a finite element dynamic analysis of the bridge structure to calculate the vibration response of the bridge when the train passes through at high speed, and to evaluate the comfort of the passengers passing through the high-speed railroad bridge.



中文翻译:


高速列车空气动力扰动作用下人行天桥的结构动力响应评价


 目的


高速列车运行引起的气动载荷可能导致人行天桥剧烈振动,从而造成极大的安全隐患。因此,本研究旨在研究高速列车通过桥梁时人行天桥的气动载荷特性,以及评估气动载荷对桥梁结构的振动响应。


设计/方法/方法


高速列车以三种不同的速度运行。将非恒定数值模拟方法与动力学建模试验方法相结合,研究了高速列车穿越人行天桥的气动压力载荷特性,并分析了桥梁的振动响应。

 发现


结果表明:当高速列车通过人行天桥时,人行天桥干扰了列车周围压力的衰减,使压力沿桥底扩散,最大正负压峰值出现在桥底中心区域,而桥梁出入口区域的压力波动较小,变化较慢; 并且垂直于列车运行方向的桥底压力衰减更快。此外,高速列车产生的压力波动将导致桥梁结构在跨中位置产生较大的垂直响应,桥梁结构的主要振动频率在 8 至 10 Hz 之间,竖向变形幅值的最大值位于桥梁的跨中区域。

 原创性/价值


本文分析了火车高速通过桥梁时流场演变的火车周围和桥底流场分布,并对桥梁结构进行有限元动力学分析,计算火车高速通过时桥梁的振动响应, 并评估通过高速铁路桥的乘客的舒适度。

更新日期:2024-11-23
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