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高速铁路箱梁-双块式轨道系统温度梯度研究
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Study on Temperature Gradient of Box Girder-Twin-BlockTrack System in High-speed Railway
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    温度作用对高速铁路箱梁-轨道整体工作性能有重要影响,通过对我国东南地区某32 m简支梁-CRTS I 型双块式无砟轨道结构温度的持续监测,重点研究了箱梁-轨道系统日温度变化规律与竖向温度梯度分布规律,基于全年每测点16 560个数据,采用高阶矩法确定具有一定重现期的箱梁-轨道系统竖向温差代表值,提出了适用于我国东南地区箱梁-轨道系统的竖向温度梯度拟合模式.研究表明:可采用一阶傅里叶级数模拟结构晴天温度升降变化特征,拟合程度较高,同一季节拟合参数a、b、ω与φ自上而下逐渐减小,温度波动幅值a随深度增加趋近于0 ℃;不同季节各截面竖向晴天温度日变化特征基本一致,于11:00~21:00前后出现正温度梯度,于01:00~9:00前后出现负温度梯度;轨道-箱梁整体对应超越概率0.01的竖向正负温差代表值分别为14.87 ℃与-6.3 ℃,箱梁顶板对应超越概率0.01的正负温差代表值分别为13.74 ℃与-3.54 ℃,底板为2.38 ℃与-1.12 ℃,可采用指数对箱梁顶板竖向正负温差代表值进行拟合,其分布规律在形式上与中国铁路桥梁规范相接近,可采用线性形式对底板温差代表值进行拟合,两种拟合形式相关系数的平方均在0.99以上,可为规范修正与桥梁设计提供参考.

    Abstract:

    Temperature effect is one of the main factors that influence the performance of box girder-track in high speed railway. Through the continuous temperature field monitoring of CRTS I twin-block ballastless track with 32 m simple supported beam bridge for the entire year,the time-dependent temperature variation and the regular distribution of temperature gradient were analyzed. The representative values of temperature differences with a certain return period were ascertained by Higher Moment Method. Based on the 16560 data at each measurement point,the vertical temperature load modes of box girder-track in southeastern China were suggested. The analysis results reveal that the goodness-of-fit is increased by using the first Fourier series to simulate the temperature fluctuation characteristics of sunny day,and the same season fitting parameters a,b,ω and φ decrease from top to bottom and the temperature fluctuation amplitude of a is close to 0℃ as the depth increases. The diurnal variation characteristics of each section on sunny days are basically similar in the different seasons,and the positive and negative temperature gradients approximately appear around 11:00 to 21:00 and 01:00 to 9:00,respectively. The positive and negative representative values of box girder-track vertically are 14.87℃ and -6.3℃ with the exceedance probability of 0.01,respectively. And the positive and negative representative values of the top plate and bottom plate are 13.74℃,-3.54℃ and 2.38℃,-1.12℃ with the exceedance probability of 0.01,respectively. The values of positive and negative temperature difference of top plate are fitted by the exponential form,which is approached to the temperature load modes of the concrete box girder in Chinese railway bridge code. The values of bottom plate are fitted by linear form. The correlation coefficients of the two fitting forms are more than 0.99,which can be used for the engineering application and reference.

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戴公连,梁金宝,苏海霆.高速铁路箱梁-双块式轨道系统温度梯度研究[J].湖南大学学报:自然科学版,2018,45(1):106~113

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  • 在线发布日期: 2018-02-26
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