基于概率需求的高速铁路无砟轨道板温度荷载取值研究Ⅱ:温度梯度作用  

Value of Temperature Loads on Probability Demand for Ballastless Track Slab Ⅱ:Thermal Gradient Actions

作　　者：欧祖敏 孙璐[2,3] 

机构地区：[1]广东珠三角城际轨道交通有限公司,广东广州510308 [2]东南大学交通学院,江苏南京210096 [3]美国普林斯顿大学工程与应用科学学院,美国新泽西州08544

出　　处：《铁道学报》2018年第1期80-86,共7页Journal of the China Railway Society

基　　金：国家自然科学基金(U1134206)

摘　　要：通过建立轨道板温度荷载的极值概率分布模型来确定其温度荷载的合理取值。利用城市气象资料和轨道板温度场方程计算得到标准厚度轨道板多年的正(负)温度梯度日最大(小)值数据,分析此数据获得正(负)温度梯度日最大(小)值的年概率分布函数及统计参数,据此建立基于设计基准期和重现期的温度梯度日最值荷载的分位值计算公式,然后给出不同设计基准期温度梯度日最值荷载与保证概率的关系曲线、常用设计基准期、常见保证概率的温度梯度日最值荷载分位值,最后提出代表不同地区的温度梯度日最值荷载标准值的建议值。结果表明:正温度梯度日最大值的年分布,哈尔滨不拒绝极值Ⅰ型分布,北京、沈阳、乌鲁木齐、兰州等地不拒绝威布尔分布,武汉、上海、广州等地不拒绝半边正态分布;负温度梯度日最小值绝对值的年分布,哈尔滨、沈阳、乌鲁木齐、兰州等地不拒绝正态分布,北京、武汉、上海、广州和昆明则不拒绝威布尔分布。An extreme value probability distribution model of the temperature load of the track slab was established to determine its reasonable value of the temperature load.Urban meteorological data and the track slab temperature field equation were used to calculate the maximum(minimum)values of the positive(negative)temperature gradient over the years of the standard thickness track slab.These values were analyzed to obtain the annual probability distribution function of the daily maximum(minimum)values of the positive(negative)temperature gradient and statistical parameters.The calculation formulas for the fractile value of the daily maximum(minimum)values of positive(negative)temperature gradient for the design reference period and the recurrence period were derived.Moreover,the relationship curves of the fractile values and the safety probability for different design reference periods,and the recommended daily maximum and minimum values for temperature gradients representing different regions were presented.The results show that the daily maximum value of the positive temperature gradient for the yearly period accepted an extreme value type I distribution in the city of Harbin,a Weibull distribution in Beijing,Shenyang,Urumqi and Lanzhou,one side of normal distributionin Wuhan,Shanghai and Guangzhou.The daily maximum value of the absolute negative temperature gradient accepted a normal distribution in Harbin,Shenyang,Urumqi and Lanzhou,a Weibull distribution in Beijing,Wuhan,Shanghai,Guangzhou and Kunming.

关 键 词：无砟轨道板 温度梯度荷载 年分布概率 设计基准期 分位值 

分 类 号：U238[交通运输工程—道路与铁道工程]