列车风作用下桥上防风屏障的疲劳性能分析
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摘要
为了保证风区高速铁路桥上列车运行安全,一般在桥上设置防风屏障。防风屏障受到列车运行产生的脉动力作用,在列车风致脉动力或其与自然风共同作用下的疲劳性能是防风屏障设计的重要问题。以兰新第二双线铁路桥上防风屏障为工程实例,建立防风屏障有限元模型,考虑外部自然风荷载和车致脉动力荷载,获得防风屏障各关键节点处的应力时程,然后基于累积损伤理论评价防风屏障结构的疲劳性能。研究结果表明:防风屏障结构钢立柱底部、防风板中部为危险位置,并且考虑自然风及车致脉动风力会极大地增加防风屏障关键节点处的应力;特别是防风板的应力远高于立柱的应力,应引起重视。针对本工程设计的防风屏障结构在设计风速下疲劳性能良好。
The windproof barriers are usually installed on the high speed railway bridges in wind zones to ensure the train operation safety.The windproof barriers are always subjected to the fluctuating force induced by the running trains.The fatigue performance of the barrier due to the combination of the train-induced fluctuating force and the natural wind force is the key to the windproof barrier design.The windproof barriers on the bridges of the second Lanzhou-Xinjiang double line were studied. The finite element model of the windproof barrier was established considering the external natural wind load and the train-induced fluctuating force. The stress histories at the key nodes of the windproof barrier were calculated,and the fatigue performance of windproof barrier was evaluated on basis of cumulative damage theory. The research results show that the critical sections include the steel standing column bottom and the middle part of the windproof plate.The stresses at the key nodes of the windproof barrier are much larger due to the consideration of the natural wind and the train-induced fluctuating wind.In particular, it is noticed that the stress of the windproof plate is significantly higher than that of the column.Under the wind load at designed speed,the fatigue performance of the windproof barrier is satisfactory.
The windproof barriers are usually installed on the high speed railway bridges in wind zones to ensure the train operation safety.The windproof barriers are always subjected to the fluctuating force induced by the running trains.The fatigue performance of the barrier due to the combination of the train-induced fluctuating force and the natural wind force is the key to the windproof barrier design.The windproof barriers on the bridges of the second Lanzhou-Xinjiang double line were studied. The finite element model of the windproof barrier was established considering the external natural wind load and the train-induced fluctuating force. The stress histories at the key nodes of the windproof barrier were calculated,and the fatigue performance of windproof barrier was evaluated on basis of cumulative damage theory. The research results show that the critical sections include the steel standing column bottom and the middle part of the windproof plate.The stresses at the key nodes of the windproof barrier are much larger due to the consideration of the natural wind and the train-induced fluctuating wind.In particular, it is noticed that the stress of the windproof plate is significantly higher than that of the column.Under the wind load at designed speed,the fatigue performance of the windproof barrier is satisfactory.
引文
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[2]FUJII T,MAEDA T,ISHIDA H,et al.Wind-induced Accidents of Train/Vehicles and Their Measures in Japan[J].Quarterly Report of RTRI,1999,40(1):50-55.
[3]张田.强风场中高速铁路桥梁列车运行安全分析及防风措施研究[D].北京:北京交通大学,2013.
[4]赵丽滨,龙丽平,蔡庆云.列车风致脉动力下声屏障的动力学性能[J].北京航空航天大学学报,2009,35(4):505-508.
[5]焦长洲,高波,王广地.声屏障结构的列车脉动风致振动分析[J].西南交通大学学报,2007,42(5):531-536.
[6]戚振宕,李人宪.高速铁路声屏障气动特性仿真分析[J].路基工程,2011,157(4):9-12.
[7]吕坚品.高速铁路插板式及整体式声屏障结构研究[D].南京:东南大学,2010.
[8]张田,郭薇薇,杜宪亭.车致脉动力作用下桥上防风屏障的振动响应分析[J].铁道建筑,2015,55(3):5-8,11.
[9]安桂萍.风区铁路沿线防风屏障结构静动力分析[D].大连:大连海事大学,2015.
[10]中华人民共和国交通部.JTG/T D-60-1—2004公路桥梁抗风设计规范[S].北京:人民交通出版社,2004.
[11]邓跞,施洲,刘兆丰.高速铁路声屏障动力特性研究[J].铁道建筑,2009,49(11):101-104.
[12]邓跞,施洲,勾红叶.380 km/h高速列车脉动风荷载仿真分析[J].铁道建筑,2011,51(9):133-136.
[13]中华人民共和国建设部.GB 50017—2003钢结构设计规范[S].北京:中国计划出版社,2003.