高温多雨地区双块式无砟轨道疲劳特性研究
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摘要
文章通过ANSYS软件建立高温多雨地区双块式无砟轨道有限元模型,利用车辆-轨道耦合动力学理论、疲劳伤损理论,在钢筋混凝土疲劳寿命研究成果的基础上,以南宁地区月平均气温为基础,预测高温多雨地区双块式无砟轨道在列车动荷载与温度荷载耦合作用下疲劳寿命,结果表明:高温多雨地区双块式无砟轨道疲劳寿命基本符合高速铁路设计年限;混凝土疲劳失效将会比钢筋疲劳失效早出现;高温多雨地区月平均气温、地区纬度、施工温度组合温度场对疲劳寿命较为不利。对今后高温多雨地区双块式无砟轨道设计与铺设提供指导性建议。
Through ANSYS software to establish double block type high temperature and rainy region without a frantic jumble track finite element model, using the theory of vehicle-track coupling dynamics and fatigue damage theory, based on the research achievements about the fatigue life of reinforced concrete, setting the monthly average temperature in Nanning area as the study temperature, the fatigue life of double block ballastless track in hot and rainy areas under the coupling of the train dynamic load is predicted. The results show that the fatigue life of double block ballastless track in hot and rainy areas is conformed to the designed service life of high-speed railway track. The happen of concrete fatigue failure is earlier than that of steel fatigue failure. The combined temperature fields of monthly average temperature, regional latitude and construction temperature in hot and rainy areas are unfavorable for fatigue life. It provides the guidance suggestions for the design and laying of double-block ballastless track in high-temperature and rainy areas in the future.
Through ANSYS software to establish double block type high temperature and rainy region without a frantic jumble track finite element model, using the theory of vehicle-track coupling dynamics and fatigue damage theory, based on the research achievements about the fatigue life of reinforced concrete, setting the monthly average temperature in Nanning area as the study temperature, the fatigue life of double block ballastless track in hot and rainy areas under the coupling of the train dynamic load is predicted. The results show that the fatigue life of double block ballastless track in hot and rainy areas is conformed to the designed service life of high-speed railway track. The happen of concrete fatigue failure is earlier than that of steel fatigue failure. The combined temperature fields of monthly average temperature, regional latitude and construction temperature in hot and rainy areas are unfavorable for fatigue life. It provides the guidance suggestions for the design and laying of double-block ballastless track in high-temperature and rainy areas in the future.
引文
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[13]曹扬风.复杂荷载下曲线地段路基上双块式无砟轨道疲劳特性研究[D].长沙:中南大学,2011.
[2]杨洋.路基上双块式无砟轨道裂纹分析及防控方法研究[D].兰州:兰州交通大学,2014.
[3]朱胜阳,蔡成标.温度和列车动荷载作用下双块式无砟轨道道床板损伤特性研究[J].中国铁道科学,2012,1:6-12.
[4]Zhu S,Cai C.Interface damage and its effect on vibrations of slab track under temperature and vehicle dynamic loads[J].International Journal of Non-Linear Mechanics,2014,58(1):222-232.
[5]Zhu S Y,Cai C B.Fatigue life prediction of CRTS I ballastless slab track[C].International Conference on Transportation Engineering,2011:1714-1719.
[6]雷晓燕.轨道力学与工程新方法[M].北京:中国铁道出版社,2002:82-89.
[7]杨洋,林洁.温度荷载作用下路基上双块式无砟轨道道床板力学特性研究[J].时代经贸,2013(9):221-221.
[8]唐长银.板式无砟道岔岔区板力学特性分析[D].长沙:中南大学,2010.
[9]尹华拓.路基上CRTSI型双块式无砟轨道裂缝及疲劳特性研究[D].长沙:中南大学,2011.
[10]滕东宇.桥上纵连板式无砟轨道底座板耐久性研究[D].北京:北京交通大学,2009.
[11]曾志平,孟晓白,宋善义,等.线路环境对双块式无砟轨道道床板温度场影响[J].铁道工程学报,2018(3):12-17.
[12]曾志平,韦合导,张广义,等.路基上双块式无碴轨道道床板疲劳特性影响因素分析[J].世界科技研究与发展,2011(10):749-752.
[13]曹扬风.复杂荷载下曲线地段路基上双块式无砟轨道疲劳特性研究[D].长沙:中南大学,2011.