高速铁路CRTSⅢ型板式无砟轨道车辆荷载横向传递规律研究
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摘要
为获取高速铁路CRTSⅢ型板式无砟轨道底部荷载横向传递规律,通过实车试验并建立多车-无砟轨道-路基空间耦合分析模型开展研究,对不同行车速度下扣件支点反力和复合板与底座板下荷载横向分布规律进行了分析.研究结果表明:仿真分析模型能够较好地模拟现场行车荷载效应.行车速度对扣件支反力和板下荷载横向分布影响较小;建议轮轴作用点处扣件荷载承担比例选取为40%,与其相邻的两个扣件由近及远依次取为25%和5%;实测复合板底部荷载在横向上呈典型的双峰型分布,峰值处压应力最大为149.5kPa;实测底座板底部荷载在横向上呈M型分布,峰值处压应力最大为16.2kPa;既有规范在无砟轨道底部荷载取值时缺乏对扣件支反力影响范围、不同无砟轨道厚度及结构特征、基础刚度、各动车组参数等影响因素的考虑,建议开展针对性研究,完善无砟轨道设计参数体系.
In order to obtain the lateral transmission law of vehicle load at the bottom of the CRTS III ballastless track of high-speed railway.We use the real vehicle test,and establish a multi vehicle-ballastless track-subgrade spatial coupling analysis model to analysis the reaction force of fasteners and the lateral distribution law of vehicle load under the composite plate and base plate when vehicle running at different speeds.The results show that the simulation analysis model can work well in simulating the effect of the on-site traffic load.The driving speed has little influence on the fastener reaction force and the lateral distribution of the load under track slab.It is recommended that the load bearing ratio of the fastener where the axial load action is 40%,and the two adjacent fasteners are 25% and 5% respectively.The measured load at the bottom of composite plate presents a typical bimodal distribution in the lateral direction,and the maximum compressive stress at the peak is 149.5 kPa.The measured load at the bottom of the base plate presents an M-shaped distribution in the lateral direction,and the maximum compressive stress at the peak is 16.2 kPa.The existing codes show less consideration to influencing factors such as the influence range of the fastener reaction force,the thickness and structural characteristics of dif-ferent ballastless tracks,the foundation stiffness,and the parameters of different types of EMUs.It is recommended to carry out targeted research and improve the design parameters system of the ballastless track.
In order to obtain the lateral transmission law of vehicle load at the bottom of the CRTS III ballastless track of high-speed railway.We use the real vehicle test,and establish a multi vehicle-ballastless track-subgrade spatial coupling analysis model to analysis the reaction force of fasteners and the lateral distribution law of vehicle load under the composite plate and base plate when vehicle running at different speeds.The results show that the simulation analysis model can work well in simulating the effect of the on-site traffic load.The driving speed has little influence on the fastener reaction force and the lateral distribution of the load under track slab.It is recommended that the load bearing ratio of the fastener where the axial load action is 40%,and the two adjacent fasteners are 25% and 5% respectively.The measured load at the bottom of composite plate presents a typical bimodal distribution in the lateral direction,and the maximum compressive stress at the peak is 149.5 kPa.The measured load at the bottom of the base plate presents an M-shaped distribution in the lateral direction,and the maximum compressive stress at the peak is 16.2 kPa.The existing codes show less consideration to influencing factors such as the influence range of the fastener reaction force,the thickness and structural characteristics of dif-ferent ballastless tracks,the foundation stiffness,and the parameters of different types of EMUs.It is recommended to carry out targeted research and improve the design parameters system of the ballastless track.
引文
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[7]朱志辉,管斌,于志武,等.列车-“站桥合一”大型客运站耦合振动响应分析[J].中国铁道科学,2014,35(5):38-46.ZHU Zhihui,GUAN Bin,YU Zhiwu,et al.Coupling vibration response analysis of train-station integrated passenger station[J].Journal of the China Railway Society,2014,35(5):38-46.(in Chinese)
[8]胡华锋.高速铁路CRTSⅠ板式无砟轨道充填层力学性能分析及试验研究[D].北京:北京交通大学,2013.HU Huafeng.Mechanical performance analysis and experimental study of filling layer for CRTSⅠslab track structure in high-speed railway[D].Beijing:Beijing Jiaotong University,2013.(in Chinese)
[9]翟婉明.车辆-轨道耦合动力学[M].北京:科学出版社,2007.ZHAI Wanming.Vehicle-track Coupling Dynamics[M].Beijing:Science Press,2007.(in Chinese)
[10]曹巧.CRH380BL动车组踏面磨耗规律研究及动力学影响分析[D].成都:西南交通大学,2015.CAO Qiao.Tread wear regularity analysis and dynamics simulation of CRH380BL EMU[D].Chengdu:Southwest Jiaotong University,2015.(in Chinese)
[11]国家铁路局.高速铁路设计规范:TB 10621-2014[S].北京:中国铁道出版社,2014.National Railways Administration of the PRC.Code for design of high speed railway:TB 10621-2014[S].Beijing:China Railway Publishing House,2016.(in Chinese)
[2]国家铁路局.铁路路基设计规范:TB 10001-2016[S].北京:中国铁道出版社,2016:26-35.National Railways Administration of the PRC.Code for design of railway earth structure:TB 10001-2016[S].Beijing:China Railway Publishing House,2016:26-35.(in Chinese)
[3]蒋红光.高速铁路板式轨道结构-路基动力相互作用及累积沉降研究[D].杭州:浙江大学,2014.JIANG Hongguang.Dynamic interaction of slab track structure-subgrade system and accumulative settlement in high-speed railways[D].Hangzhou:Zhejiang University,2014.(in Chinese)
[4]SADEGHI J,LIRAVI H,ESMAEILI M H.Experimental investigation on loading pattern of railway concrete slabs[J].Construction and Building Materials,2017,153:481-495.
[5]蔡成标,翟婉明,王开云.遂渝线路基上板式轨道动力性能计算及评估分析[J].中国铁道科学,2006,27(4):17-21.CAI Chengbiao,ZHAI Wanming,WANG Kaiyun.The calculation and evaluation of slab track dynamic performance on Suiyu line[J].Journal of the China Railway Society,2006,27(4):17-21.(in Chinese)
[6]王平.道岔区轮轨系统空间耦合振动模型及其应用[J].西南交通大学学报,1998,33(3):284-289.WANG Ping.Spatial coupling vibration model of wheel-rail system in turnout area and its application[J].Journal of Southwest University,1998,33(3):284-289.(in Chinese)
[7]朱志辉,管斌,于志武,等.列车-“站桥合一”大型客运站耦合振动响应分析[J].中国铁道科学,2014,35(5):38-46.ZHU Zhihui,GUAN Bin,YU Zhiwu,et al.Coupling vibration response analysis of train-station integrated passenger station[J].Journal of the China Railway Society,2014,35(5):38-46.(in Chinese)
[8]胡华锋.高速铁路CRTSⅠ板式无砟轨道充填层力学性能分析及试验研究[D].北京:北京交通大学,2013.HU Huafeng.Mechanical performance analysis and experimental study of filling layer for CRTSⅠslab track structure in high-speed railway[D].Beijing:Beijing Jiaotong University,2013.(in Chinese)
[9]翟婉明.车辆-轨道耦合动力学[M].北京:科学出版社,2007.ZHAI Wanming.Vehicle-track Coupling Dynamics[M].Beijing:Science Press,2007.(in Chinese)
[10]曹巧.CRH380BL动车组踏面磨耗规律研究及动力学影响分析[D].成都:西南交通大学,2015.CAO Qiao.Tread wear regularity analysis and dynamics simulation of CRH380BL EMU[D].Chengdu:Southwest Jiaotong University,2015.(in Chinese)
[11]国家铁路局.高速铁路设计规范:TB 10621-2014[S].北京:中国铁道出版社,2014.National Railways Administration of the PRC.Code for design of high speed railway:TB 10621-2014[S].Beijing:China Railway Publishing House,2016.(in Chinese)