悬挂式单轨交通柔性吊杆拱桥风-车-桥耦合仿真分析
曾敏
Wind-Vehicle-Bridge Coupling Simulation Analysis of Flexible Hanger Arch Bridge in Suspended Monorail Transit
ZENG Min
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作者信息:中铁第四勘察设计院集团有限公司，430063，武汉
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Affiliation:China Railway Fourth Survey and Design Institute Group Co., Ltd., 430063, Wuhan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.01.007
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中图分类号/CLCN:U232
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栏目/Col:研究报告
摘要:
［目的］悬挂式单轨交通柔性吊杆拱桥因具有结构刚度小、轨道梁梁体宽跨比小的特点，易受风荷载作用从而影响桥梁结构的安全性和列车的舒适性，需对风-车-桥耦合结构进行研究。［方法］以我国首条悬挂式单轨交通线路为工程背景，通过ANSYS有限元软件建立长度为80m的柔性吊杆拱桥模型，通过Fluent有限元软件以及多体动力学软件UM进行风-车-桥耦合分析，并通过平稳性指标判断行车情况。［结果及结论］在风荷载作用下，列车的横向平稳性指标变化较竖向更剧烈，其平稳性处于列车运行合格的边缘。当车速和风速增大时，列车的横向振动明显提升；车速40km/h下，20m/s风速相比于10m/s风速的最大桥梁横向位移增幅达159.5%，最大竖向位移增幅达11%；15m/s风速相比于10m/s风速的最大桥梁横向位移增幅达70%，最大竖向位移增幅达24.1%。
Abstracts:
［Objective］ Due to the characteristics of small structural stiffness and small width-span ratio of the track beam, the flexible hanger arch bridge in suspended monorail transit is vulnerable to wind loads, thus influencing the safety of the bridge structure and the ride comfort of trains. Therefore, it is necessary to conduct research on the wind-vehicle-bridge coupling structure. ［Method］ With the first suspended monorail transit line in China as the engineering background, a flexible 80-meter hanger arch bridge model is established by the ANSYS finite element software. The wind-vehicle-bridge coupling analysis is carried out through the Fluent finite element software and the multi-body dynamics software UM, and the running condition of the vehicle is judged by the ride comfort index. ［Result & Conclusion］ Under the action of wind loads, the lateral ride comfort index of the train changes more drastically than the vertical one, and the ride comfort is on the verge to the train operation requirements. When the train speed and wind speed increase, the lateral vibration of the train will be significantly enhanced. At the train speed of 40 km/h, compared with the wind speed of 10 m/s, the maximum lateral displacement of the bridge increases by 159.5% with a wind speed of 20 m/s, and the maximum vertical displacement increases by 11%. While the maximum lateral displacement of the bridge increases by 70% with a wind speed of 15 m/s, the maximum vertical displacement increases by 24.1%.
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