高速铁路无砟轨道结构温度与大气温度关系试验研究

为研究高速铁路无砟轨道结构温度与大气温度关系,基于2年实测数据,采用时间序列差分法分离日照波动温度,得出我国华东地区桥上CRTSⅡ型轨道结构遮阴温度时程曲线,通过统计分析提出轨道年均匀温度谱概念,并用傅里叶级数进行拟合,研究轨道结构均匀温度与大气温度关系函数,并通过50年历史气温数据进行预测。研究表明,轨道结构各部遮阴温度相近,可由统一的年均匀温度谱系傅里叶级数表示,其年均温为21. 73℃,年温变幅12. 27℃,周期366 d。轨道结构温度-大气温度关系可用线性函数表示,与欧洲规范较为相似,但整体略大,其中高温偏大1. 07℃,低温偏大2. 32℃。重现期50、100、150年和300年的轨道最大、最小均匀温度代表值分别为42. 42、44. 36、45. 42、47. 09℃和4. 45、0. 7、-1. 39、-5. 21℃。

Experimental Study on the Relationship between High-speed Railway Ballastless Track Temperature and Atmospheric Temperature

In order to investigate the relationship between high-speed railway ballastless track temperature and atmospheric temperature,the shading temperature time travel curves of CRTSII track structure are obtained based on 2 years' measured data and by using time series difference method to separate the impact of sunlight action. Through statistical analysis,an annual uniform temperature spectrum concept is proposed and fourier series are fitted to study the relation function between track structure uniform temperature and atmospheric temperature, and to conduct forecasting with historical atmospheric temperature records of 50 years. The results show that shaded temperatures of each track structure are close and could be indicated by an uniform annual temperature spectrum fourier formula. The annual uniform temperature is 21. 73 ℃,the annual temperature range ability is 12. 27 ℃ and the period is367 days. Track structure-atmospheric temperature relationship could be expressed by a linear function which is similar to Euro Code,but somewhat larger by 1. 07 ℃ for high temperature and 2. 32 ℃ for low temperature. The maximum and minimum track construct uniform temperature representative values with recurrence interval of 50,100,150 and 300 years are 42. 42,44. 36,45. 42,47. 09 ℃ and 4. 45,0. 7,-1. 39,-5. 21 ℃ respectively.