风雨联合作用下南京大胜关长江大桥地铁列车运营安全研究
汪皓1司天文2郑史雄2马舜3周云强3
Safety of Metro Train Operation on Nanjing Dashengguan Yangtze River Bridge under Combined Wind-Rain Action
WANG HaoSI TianwenZHENG ShixiongMA ShunZHOU Yunqiang
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作者信息:1.中铁城市规划设计研究院有限公司， 241060， 芜湖
2.西南交通大学土木工程学院， 610031， 成都
3.中铁大桥勘测设计院集团有限公司， 210031， 南京
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Affiliation:China Railway Urban Planning & Design Institute Co., Ltd., 241060, Wuhu, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.06.020
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中图分类号/CLCN:U270.1+1
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栏目/Col:研究报告
摘要:
为降低风雨联合作用对大跨度桥梁上城市轨道交通运营安全造成的影响，以南京大胜关长江大桥地铁搭载段为例，建立横风作用下列车倾覆数学计算模型，并研究列车在风雨联合作用下的运营安全性。结果表明：列车在背风侧运行时的临界倾覆风速大于列车在迎风侧运行时；相对于仅有强风作用，风雨联合作用下列车迎、背风侧的临界倾覆风速均有所降低且背风侧降低较为显著；仅强风作用时桥梁附属设施的增加使列车临界风速有所降低，风雨联合作用下桥梁附属设施的增加对列车临界倾覆风速的影响较小；风雨联合作用下，列车在边跨与中跨运行时的临界倾覆风速变化不大；雨强增大时临界倾覆风速降低不大。由此可见，风雨联合作用下对行车安全影响的主要因素是风速。
Abstracts:
To reduce the combined impact of wind rain action on the safety of urban rail transit operation on long span bridges, taking the metro carrying section of Nanjing Dashengguan Yangtze River Bridge as an example, a mathematical model for calculating train overturning under crosswind action is established, and the train operation safety under wind rain action is studied. Results show that compared to running on the windward side, the critical train overturning wind speed （hereafter ′critical speed′ for short） is higher when train is running on the leeward side; compared to the scenario of strong wind only, the critical speed on either the windward or the leeward sides is lower under wind rain action, while the reduction on the leeward side is more significant; adding bridge ancillary facilities under action of only strong wind reduces the critical speed, and under combined wind rain action, the impact of adding bridge ancillary facilities on critical speed is less; the critical speed does not change much when train runs on side span and mid span under wind rain action; the increase of rainfall intensity has little effect on the reduction of the critical speed. Therefore, it can be derived that wind speed is the main factor affecting train operation safety under combined wind rain action.
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