铜陵公铁两用长江大桥船撞引起列车脱轨分析

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摘要研究目的:准确测算船撞作用下桥梁的结构动力响应，对评估因船—桥碰撞后桥梁响应而引起的列车脱轨分析具有重要意义。本文围绕铜陵公铁两用长江大桥论述船撞桥墩引起列车脱轨分析的一般流程，首先通过ANSYS/LS-DYNA非线性有限元软件模拟10 000 t级与5 000 t级船舶在最高、常规以及最低通航水位下满载正撞和侧桥向20°撞击桥梁的主塔和辅助墩，得出在各船撞工况下碰撞力-时程曲线。然后将船舶撞击时程曲线作为动力荷载输入至整桥有限元模型中，计算桥梁结构关键部位尤其是主梁的横向位移和加速度响应。研究结论:(1)在最高通航水位下，船舶满载正撞桥墩产生的撞击力最大；在该最不利工况下，撞击作用对桥梁结构动力响应以及列车的脱轨风险具有较大影响；(2)当3^#主塔受到10 000 t级船舶撞击时，导致2^#桥墩墩顶主梁的横向加速度达到0.922 m/s²，未超过列车脱轨加速度临界限制1 m/s²，列车脱轨概率极小；(3)通过简化的风险标准导出脱轨概率公式计算表明，该桥遭受到船舶撞击时，其列车的脱轨概率为9×10^-5~1.5×10^-4；(4)本文的研究结果可供航道上铁路桥梁因船舶撞击导致列车通行安全性研究参考。

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	方海
	孙慧明
	刘伟庆
	冒一锋
	张强

关键词 ：船—桥碰撞, 动力响应, 列车脱轨, 风险概率

Abstract：Research purposes:Precise prediction for mechanical behavior of the bridge under ship collision force is important to assess the analysis of train derailment after hitting the pier. This paper focuses on the Tongling Yangtze River Bridge Combined Road with Railway for ship collision simulation, uses the nonlinear finite element software of ANSYS / LS-DYNA to simulate the ship's bow section of 10 000 t and 5 000 t class hitting bridge tower column at front and axle to 20° of side in highest navigable water level, conventional navigable water level and the minimum navigable water level. Curves of collision force-period at different working conditions are summarized. On this basis, when the impact load affects as input loads, the displacement and acceleration response can be used by finite element analysis under the collision and study the dynamic response of the bridge caused by a train derailment risk.Research conclusions:(1) The impact force of the bridge is largest when a laden ship is hitting the pier at the highest navigable water level. In the most unfavorable condition, the collision have lardge impact on bridge structure and derailment risk of trains. (2) The transverse acceleration of the girder on the top of 2^# pier can reach to 0.922 m/s², but it does not exceed acceleration excitation limit (1 m/s²) when 3^# piers are hitted by the 10 000 t ship at the peak load of collision, so the probability of train derailment is minimal. (3) Based on the probability formula of the derailment by simplifying risk criteria, the derailment probability of train is 9×10^-5~1.5×10^-4 during the ship-bridge collision. (4) The research results can provide the reference for train traffic safety on railway bridge caused by ship collisions.

Key words： ship-bridge collision dynamic response train derailment risk probability

收稿日期: 2014-01-26

PACS:

U442.59

作者简介: 方海，1981年出生，男，副教授。

引用本文:

方海，孙慧明，刘伟庆，冒一锋，张强. 铜陵公铁两用长江大桥船撞引起列车脱轨分析[J]. 铁道工程, 2014, 31(9): 65-70.
FANG Hai, SUN Hui-ming, LIU Wei-qing, MAO Yi-feng, ZHANG Qiang. Analysis of Train Derailment after Hitting the Pier of Tongling Yangtze River Bridge Combined Road with Railway. 铁道工程, 2014, 31(9): 65-70.

链接本文:

http://tdgcxb.crec.cn/CN/ 或 http://tdgcxb.crec.cn/CN/Y2014/V31/I9/65

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