基于概率需求的高速铁路无砟轨道板温度荷载取值研究Ⅰ:轴向均匀温度作用  

Probability Value of Temperature Loads for Ballastless Track Slab of High Speed Railway:Axial Uniform Thermal Actions

作　　者：欧祖敏[1] 孙璐[1,2] 周杰[1] 赵国堂 

机构地区：[1]东南大学交通学院,江苏南京210096 [2]美国华盛顿Catholic大学土木工程系,华盛顿20064 [3]中国铁路总公司,北京100844

出　　处：《铁道学报》2016年第2期96-104,共9页Journal of the China Railway Society

基　　金：国家自然科学基金(U1134206)

摘　　要：本文通过建立轨道板温度荷载的极值概率分布模型来确定轨道板温度荷载的合理取值。利用轨道板温度场方程和城市气象资料计算得出的轨道板多年轴向均匀温度日最值数据,分析得到轨道板轴向均匀温度日最值和城市气温日最值的月份概率分布函数及统计参数,以此为基础建立轨道板轴向均匀温度日最值和城市气温日最值的年极值概率分布函数及设计基准期极值概率分布函数;利用这两个分布函数计算得到常见设计基准期、常用保证概率的轴向均匀温度日最值荷载的分位值和标准值建议,同时得出不同设计基准期轴向均匀温度日最值荷载与保证概率的曲线关系,用于不同概率需求。研究结果表明:北京和哈尔滨地区的轨道板轴向均匀温度日最值和气温日最值的月份分布函数基本符合正态概率密度曲线;设计基准期和重现期轴向均匀温度日最值的分位值意义明确,可用于高速铁路轨道板设计。An extreme value probabilistic distribution model of the temperature load of the track slab was established to determine the reasonable value of the temperature load of the ballastless track slab.The probability distribution functions and its statistical parameters of daily minimum and maximum values of axial uniform temperatures of the track slab and daily minimum and maximum values of the local shade air temperatures for the monthly periods were obtained by a statistical analysis of the daily minimum and maximum values of historical axial uniform temperatures of track slab,which were calculated by the track slab temperature field equation and historical meteorological data.The probability distribution functions of the uniform thermal action and shade air temperature for the yearly period and for the design reference period were derived from the estimated probability distribution function.These two distribution functions were used to calculate the fractile value and the characteristic value of the track slab uniform thermal actions of common design reference periods and safety probability.The curves about the characteristic value and the safety probability for different design referenceperiods were obtained to meet different probability needs.The findings suggested that most of the probability distribution functions for the monthly period were consistent with normal distribution density curves.The fractile value of the daily minimum and maximum values of the axial uniform temperatures during the design reference period and the return period was clear,which can be used for the design of the track slabs of high speed railway.

关 键 词：无砟轨道 温度荷载 极值概率模型 特征值 保证概率 

分 类 号：U213.244[交通运输工程—道路与铁道工程] U238