墩台沉降对桥上纵连板式无砟轨道线路动力影响
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摘要
基于耦合动力学理论,考虑纵连板式无砟轨道-桥梁系统各部件间非线性接触,建立高速列车-纵连板式无砟轨道-桥梁三维非线性有限元耦合动力学模型。运用建立的模型,研究高速列车在桥上纵连板式无砟轨道线路墩台不均匀沉降区段行驶时,墩台沉降对高速列车-纵连板式无砟轨道-桥梁耦合系统动力特性的影响。研究结果如下:①墩台不均匀沉降对高速列车、纵连板式无砟轨道各部件振动特性有很大影响,但对桥梁振动影响相对较小;②墩台不均匀沉降对最大垂向轮轨力、扣件最大压力影响较小,而对钢轨最大正弯矩、扣件最大拉力、轨道板和底座板纵向最大拉应力、CA砂浆最大压应力影响较大;③墩台不均匀沉降对耦合系统振动特性及无砟轨道动应力特性的影响不是简单的单调线性增加,而与墩台不均匀沉降引起的无砟轨道各部件间、无砟轨道与桥梁间局部脱空有关。
Based on the vehicle-track coupled dynamic theory, considering nonlinear contacts among components of a longitudinal connected slab ballastless track-bridge system, a 3-D nonlinear finite element coupled dynamic model for a high speed train-longitudinal connected slab ballastless track-bridge system was established. With the established model, when a high speed train passing the uneven settlement region of pier and abutment of longitudinal connected ballastless slab track on bridge, effects of uneven settlement of pier and abutment on dynamic characteristics of the high speed train-longitudinal connected slab ballastless track-bridge system were studied. The results showed that ① uneven settlement of pier and abutment greatly affects vibration characteristics of components of high speed train and longitudinal connected slab ballastless track, but it has little influence on bridge vibration; ② uneven settlement of pier and abutment has relatively small influence on maximum vertical wheel-rail force and maximum pressure force on fasteners, however, it has large influence on maximum positive moment of rail, maximum tensile force of fastener, maximum longitudinal tensile stress of slab and base plate, and maximum pressure stress of CA mortar; ③ effects of uneven settlement of pier and abutment on dynamic characteristics of the coupled system and dynamic stress features of ballastless track are not a simple linear monotonic increase, but related to local void among components of ballastless track and that between ballastless track and bridge caused by uneven settlement of pier and abutment.
Based on the vehicle-track coupled dynamic theory, considering nonlinear contacts among components of a longitudinal connected slab ballastless track-bridge system, a 3-D nonlinear finite element coupled dynamic model for a high speed train-longitudinal connected slab ballastless track-bridge system was established. With the established model, when a high speed train passing the uneven settlement region of pier and abutment of longitudinal connected ballastless slab track on bridge, effects of uneven settlement of pier and abutment on dynamic characteristics of the high speed train-longitudinal connected slab ballastless track-bridge system were studied. The results showed that ① uneven settlement of pier and abutment greatly affects vibration characteristics of components of high speed train and longitudinal connected slab ballastless track, but it has little influence on bridge vibration; ② uneven settlement of pier and abutment has relatively small influence on maximum vertical wheel-rail force and maximum pressure force on fasteners, however, it has large influence on maximum positive moment of rail, maximum tensile force of fastener, maximum longitudinal tensile stress of slab and base plate, and maximum pressure stress of CA mortar; ③ effects of uneven settlement of pier and abutment on dynamic characteristics of the coupled system and dynamic stress features of ballastless track are not a simple linear monotonic increase, but related to local void among components of ballastless track and that between ballastless track and bridge caused by uneven settlement of pier and abutment.
引文
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[11] 李秀梅,吴锋,黄哲华.PCG法的理论解释及在结构分析中的应用[J].广西大学学报(自然科学版),2009,34(4):463-468.LI Xiumei,WU Feng,HUANG Zhehua.Theoretical explanation for PCG method and its application in structural analysis[J].Journal of Guangxi University (Natural Science and Technology),2009,34(4):463-468.
[12] 张卫华.高速转向架技术的创新研究[J].中国工程科学,2009,11(10):8-18.ZHANG Weihua.Innovation study on the high-speed bogie technology[J].Engineering Sciences,2009,11(10):8-18.
[2] LUO Wenjun,LEI Xiaoyan.Analysis of dynamic behavior for ballastless track-bridge with a hybrid method[J].Intelligent Automation & Soft Computing,2014,20(4) :487-500.
[3] 房建,雷晓燕,练松良.轨道不平顺波长对桥上CRTSⅡ型板式轨道振动特性的影响[J].华东交通大学学报,2014,31(1):1-6.FANG Jian,LEI Xiaoyan,LIAN Songliang.Impacts of track irregularity wavelength on vibration characteristics of elevated CRTS II slab track[J].Journal of East China Jiaotong University,2014,31(1) :1-6.
[4] 陈兆玮,孙宇,翟婉明.高速铁路桥墩沉降与钢轨变形的映射关系(Ⅱ):纵连板式无砟轨道系统[J].中国科学(技术科学),2014,44(7):778-785.CHEN Zhaowei,SUN Yu,ZHAI Wanming.Mapping relationship between pier settlement and rail deformation of high speed railways-part (II):The longitudinal connected ballastless track system[J].Scientia Sinica (Technologica),2014,44(7):778-785.
[5] 姜惠峰.高速铁路CRTS_II型板式无砟轨道桥梁基础沉降顶升修复试验研究[D].北京:中国铁道科学研究院,2015.
[6] 王昆鹏.桥梁附加变形对高速列车运行安全影响的研究[D].北京:北京交通大学,2015.
[7] 杨静静.CRTS Ⅱ型轨道板温度变形及其对车-线-桥系统动力响应的影响[D].北京:北京交通大学,2017.
[8] 蔡成标,翟婉明,王开云.高速列车与桥上板式轨道动力学仿真分析[J].中国铁道科学,2004,25(5):57-60.CAI Chengbiao,ZHAI Wanming,WANG Kaiyun,Dynamics simulation of interactions between high-speed train and slab track laid on bridge[J].China Railway Science,2004,25(5):57-60.
[9] 徐庆元,范浩,李斌,等.CRTS-II 型板式无砟轨道线路路基不均匀沉降限值研究[J].中南大学学报(自然科学版),2013,44(12):5038-5044.XU Qingyuan,FAN Hao,LI Bin,Limited value for uneven settlement of subgrade under CRTS-II type slab track[J].Journal of Central South University (Science and Technology),2013,44(12):5038-5044.
[10] 徐庆元,李斌,范浩.路基不均匀沉降对列车一路基上无砟轨道耦合系统动力特性的影响[J].铁道科学与工程学报,2012,9(3):13-19.XU Qingyuan,LI Bin,FAN Hao,Influence of uneven settlement of subgrade on dynamic characteristic of train-ballastless track on subgrade coupling system[J].Journal of Railway Science and Engineering,2012,9(3):13-19.
[11] 李秀梅,吴锋,黄哲华.PCG法的理论解释及在结构分析中的应用[J].广西大学学报(自然科学版),2009,34(4):463-468.LI Xiumei,WU Feng,HUANG Zhehua.Theoretical explanation for PCG method and its application in structural analysis[J].Journal of Guangxi University (Natural Science and Technology),2009,34(4):463-468.
[12] 张卫华.高速转向架技术的创新研究[J].中国工程科学,2009,11(10):8-18.ZHANG Weihua.Innovation study on the high-speed bogie technology[J].Engineering Sciences,2009,11(10):8-18.
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