基于风-车-桥的城市轨道交通桥横向挠跨比建议值研究

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摘要《城市轨道交通桥梁设计规范》中横向挠跨比要求1/4000，但部分建成使用的桥并不满足规范中的限值却也能安全运营，城市轨道专用桥受桥宽限制，其横向刚度相对较小，对于大跨度城市轨道交通桥梁仍按1/4000设计时，可能导致建设成本增大。以五座在建或已建成的城市轨道交通专用桥梁作为背景，通过改变主梁截面横向惯性矩实现不同的桥梁横向刚度，采用自主研发软件BANSYS，进行风—车—桥耦合振动分析，以考查桥梁横向刚度对行车性能的影响，考查了车型、桥梁类型及跨度、不同安全指标类型等因素的影响，得到车辆安全性指标超限时的横向刚度限值，以此时桥梁模型按列车横向摇摆力、风力作用下得到相应的限值挠跨比。结果表明，在列车横向摇摆力和风力作用下，城市轨道交通专用桥的横向挠跨比不大于1/2500时，在风速为25m/s，车速不超过80km/h条件下运行时可满足行车安全性。

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	李永乐1
	2
	龙俊廷1
	向活跃1
	2
	马虎3
	何孟松3
	谢佳桃1

关键词 ：大跨度城市轨道交通专用桥；横向刚度；横向挠跨比；风&mdash, 车&mdash, 桥；耦合振动

Abstract：The limit value of lateral deflection to span ratio is 1/4 000 in the code for the design of an urban rail transit bridge; however, some built bridges do not meet the limits in the code but can also operate safely.An urban rail transit bridge is limited by bridge width.Its transverse stiffness is relatively small.For long-span urban rail transit bridges, if they are still designed at 1/4 000, construction costs may increase.This paper took the actual bridges of five engineering projects as the background and used the independent development software BANSYS to analyze coupling vibration of a wind-vehicle-bridge system.The transverse stiffness of the bridge was changed by changing the section transverse moment of inertia of the main beam, and its influence on vehicle driving was analyzed, and the influence of factors such as vehicle type, bridges type and span, different safety index were analyzed, the lateral stiffness limit was obtained when the vehicle safety index exceeded the limit.The bridge model was used at this condition to obtain the deflection span limit under the effect of the vehicle’s lateral oscillation force and wind force.The results show that under the effect of the vehicle’s lateral oscillation force and wind force, when the value of the transverse deflection-span ratio for urban rail transit bridge is not more than 1/2 500, driving safety can be guaranteed when the wind speed is 25 m/s and the speed is not more than 80 km/h.

Key words： special urban rail transit bridges transverse stiffness deflection-span ratio wind-vehicle-bridge coupling vibration

收稿日期: 2019-07-09 出版日期: 2020-12-15

引用本文:

李永乐1,2,龙俊廷1，向活跃1,2,马虎3，何孟松3，谢佳桃1. 基于风-车-桥的城市轨道交通桥横向挠跨比建议值研究[J]. 振动与冲击, 2020, 39(24): 211-217.
LI Yongle1,2, LONG Junting1, XIANG Huoyue1,2, MA Hu3, HE Mengsong3, XIE Jiatao1. Transverse deflection-span ratio suggested value of an urban rail transit bridge based on a wind-vehicle-bridge system. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(24): 211-217.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I24/211

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