轨道框架阻力下桥上无缝线路梁轨相互作用
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摘要
研究目的:基于轨道框架道床阻力的试验研究成果,建立包含梁缝、梁端悬出长度等局部细节的有砟轨道桥上无缝线路轨-枕(框架)-梁-墩一体化计算模型,提出轨道框架组建原则,构造组建轨道框架的迭代算法,以某(68. 8+120+68. 8) m大跨连续梁桥为例,分析轨道框架阻力下的梁轨相互作用规律,以期为桥上无缝线路设计提供指导。研究结论:(1)本文提出的轨道框架组建算法具有自适应的能力,可依据梁轨相互作用剧烈程度确定轨道框架内轨枕根数,实现线路阻力的自动调节;(2)考虑轨道框架阻力会造成钢轨伸缩力和挠曲力大幅度降低,断缝值大幅度增加,甚至超过规范限值,故建议桥上无缝线路伸缩、挠曲及断轨工况计算中应考虑轨道框架的影响;(3)轨道框架阻力对钢轨制动力影响较小,降低值不超过5. 0%,可采用传统单根轨枕阻力进行计算;(4)本研究成果可为桥上无缝线路设计提供指导。
Research purposes: Based on experimental research results of longitudinal resistance of ballast bed considering track frame,a rail-frame-bridge-pier calculation model considering local details of bridge structures is established for example beam crevice,distance between beam end and adjacent bearing. The principle of track frame formation is proposed,and an iterative algorithm for constructing track frames is constructed. Taking a long-span continuous beam bridge with span of( 68. 8 + 120 + 68. 8) m as an example,the laws of bridge-track interaction under the longitudinal resistance of track frame are analyzed,so as to provide guidance for the design of continuous welded rail( CWR) on bridge.Research conclusions:( 1) The iterative algorithm for constructing track frames has adaptive features,which can define the number of sleepers in track frames based on the level of bridge-track interaction to adjust the longitudinal resistance automatically.( 2) When considering the longitudinal resistance of track frame,the rail expansion force and bendingforce decreases dramatically,but the broken gap increases,even overruns the limit of code. It is suggested to consider the effect of track frame when analyzing the bridge-track interaction of CWR on bridge under expansion,bending and rail breaking conditions.( 3) The longitudinal resistance of track frame has little effect on braking condition,which only reduce the braking force less than 5. 0 percent. So,single sleeper resistance can be used under braking condition as usual.( 4) The research results can provide guidance for the design of CWR on bridge.
Research purposes: Based on experimental research results of longitudinal resistance of ballast bed considering track frame,a rail-frame-bridge-pier calculation model considering local details of bridge structures is established for example beam crevice,distance between beam end and adjacent bearing. The principle of track frame formation is proposed,and an iterative algorithm for constructing track frames is constructed. Taking a long-span continuous beam bridge with span of( 68. 8 + 120 + 68. 8) m as an example,the laws of bridge-track interaction under the longitudinal resistance of track frame are analyzed,so as to provide guidance for the design of continuous welded rail( CWR) on bridge.Research conclusions:( 1) The iterative algorithm for constructing track frames has adaptive features,which can define the number of sleepers in track frames based on the level of bridge-track interaction to adjust the longitudinal resistance automatically.( 2) When considering the longitudinal resistance of track frame,the rail expansion force and bendingforce decreases dramatically,but the broken gap increases,even overruns the limit of code. It is suggested to consider the effect of track frame when analyzing the bridge-track interaction of CWR on bridge under expansion,bending and rail breaking conditions.( 3) The longitudinal resistance of track frame has little effect on braking condition,which only reduce the braking force less than 5. 0 percent. So,single sleeper resistance can be used under braking condition as usual.( 4) The research results can provide guidance for the design of CWR on bridge.
引文
[1]王平,肖杰灵,田春香,等.高速铁路桥上无缝线路技术[M].北京:中国铁道出版社,2016.Wang Ping, Xiao Jieling, Tian Chunxiang, etc.Technology of Continuous Welded Rail on Bridges for High-speed Railway[M]. Beijing:China Railway Publishing House,2016.
[2]闫斌,戴公连.考虑加载历史的高速铁路梁轨相互作用分析[J].铁道学报,2014(6):75-80.Yan Bin,Dai Gonglian. Analysis of Interaction between Continuously-welded Rail and High-speed Railway Bride Considering Loading-history[J]. Journal of the China Railway Society,2014(6):75-80.
[3]冯青松,孙魁,罗信伟,等.简支梁桥上有轨电车嵌入式轨道纵向力分析[J].铁道工程学报,2017(11):27-32.Feng Qingsong, Sun Kui, Luo Xinwei, etc.Longitudinal Force Analysis of Tram Embedded Track on Simply Supported Bridge[J]. Journal of Railway Engineering Society,2017(11):27-32.
[4]张鹏飞,桂昊,高亮,等.简支梁桥上I型板式无砟轨道制动力与位移分析[J].铁道科学与工程学报,2017(11):2323-2332.Zhang Pengfei,Gui Hao,Gao Liang,etc. Analysis of Braking Force and Displacement for CRTS I Slab Ballastless Track on Simply Supported Bridge[J].Journal of Railway Science and Engineering,2017(11):2323-2332.
[5]杨艳丽. III型混凝土轨枕有砟道床纵横向阻力设计参数试验研究[J].铁道工程学报,2010(10):49-51.Yang Yanli. Experimental Study on Design Parameters of Longitudinal and Lateral Resistance of Ballast Bed forⅢ-Type Concrete Sleeper[J]. Journal of Railway Engineering Society,2010(10):49-51.
[6] TB 10015—2012,铁路无缝线路设计规范[S].TB 10015—2012, Code for Design of Railway Continuous Welded Rail[S].
[7]刘浩,王源,刘淦中,等.轨道框架对散粒体道床非线性纵向阻力影响的试验研究[J].铁道学报,2017(5):84-89.Liu Hao, Wang Yuan, Liu Ganzhong, etc.Experimental Study on the Effect of Track Frame on Nonlinear Longitudinal Resistance of Ballast Bed[J].Journal of the China Railway Society,2017(5):84-89.
[8] Le Pen,L. M.,Powrie W. Contribution of Base,Crib and Shoulder Ballast to the Lateral Sliding Resistance of Railway Track:a Geotechnical Perspective[J].Proceedings of the Institution of Mechanical Engineers Part F:Journal of Rail and Rapid Transit,2011(2):113-128.
[2]闫斌,戴公连.考虑加载历史的高速铁路梁轨相互作用分析[J].铁道学报,2014(6):75-80.Yan Bin,Dai Gonglian. Analysis of Interaction between Continuously-welded Rail and High-speed Railway Bride Considering Loading-history[J]. Journal of the China Railway Society,2014(6):75-80.
[3]冯青松,孙魁,罗信伟,等.简支梁桥上有轨电车嵌入式轨道纵向力分析[J].铁道工程学报,2017(11):27-32.Feng Qingsong, Sun Kui, Luo Xinwei, etc.Longitudinal Force Analysis of Tram Embedded Track on Simply Supported Bridge[J]. Journal of Railway Engineering Society,2017(11):27-32.
[4]张鹏飞,桂昊,高亮,等.简支梁桥上I型板式无砟轨道制动力与位移分析[J].铁道科学与工程学报,2017(11):2323-2332.Zhang Pengfei,Gui Hao,Gao Liang,etc. Analysis of Braking Force and Displacement for CRTS I Slab Ballastless Track on Simply Supported Bridge[J].Journal of Railway Science and Engineering,2017(11):2323-2332.
[5]杨艳丽. III型混凝土轨枕有砟道床纵横向阻力设计参数试验研究[J].铁道工程学报,2010(10):49-51.Yang Yanli. Experimental Study on Design Parameters of Longitudinal and Lateral Resistance of Ballast Bed forⅢ-Type Concrete Sleeper[J]. Journal of Railway Engineering Society,2010(10):49-51.
[6] TB 10015—2012,铁路无缝线路设计规范[S].TB 10015—2012, Code for Design of Railway Continuous Welded Rail[S].
[7]刘浩,王源,刘淦中,等.轨道框架对散粒体道床非线性纵向阻力影响的试验研究[J].铁道学报,2017(5):84-89.Liu Hao, Wang Yuan, Liu Ganzhong, etc.Experimental Study on the Effect of Track Frame on Nonlinear Longitudinal Resistance of Ballast Bed[J].Journal of the China Railway Society,2017(5):84-89.
[8] Le Pen,L. M.,Powrie W. Contribution of Base,Crib and Shoulder Ballast to the Lateral Sliding Resistance of Railway Track:a Geotechnical Perspective[J].Proceedings of the Institution of Mechanical Engineers Part F:Journal of Rail and Rapid Transit,2011(2):113-128.