考虑内腔空气影响的高速磁浮轨道箱梁日照温度场研究

高速磁浮混凝土轨道梁在日照作用下温度分布不均匀,易引起梁体变形、开裂,影响行车安全.本文以上海浦东地区的气候条件为基础,研究了日照辐射下高速磁浮混凝土轨道箱梁的温度分布规律.首先基于固体传热和流体传热理论计算了浦东地区的太阳辐射值,然后建立了混凝土轨道箱梁有限元模型,并在考虑箱梁内腔空气传热效应的前提下计算了轨道梁整体...

Research on Temperature Field Caused by Solar Radiation of High Speed Maglev Track Box Girder Considering Influence of Inner Cavity Air

Under the action of solar radiation,the temperature distribution of high speed maglev concrete track girder is uneven,which is easy to cause girder deformation and cracking,and affect the driving safety. Based on the climatic conditions in Pudong area of Shanghai City,the temperature distribution laws of high speed maglev concrete track box girder under solar radiation were studied. Firstly,based on the theory of solid heat transfer and fluid heat transfer,the solar radiation value in Pudong area was calculated,then the finite element model of concrete track box girder was established. The overall temperature distribution of track girder was calculated on the premise of considering the heat transfer effect of air in the box girder. The results show that under the long-term high temperature environment in summer,the air temperature in the inner cavity of the box girder will rise to the highest value of the external ambient temperature,and the overall average temperature of the box girder will be higher than the external ambient temperature.The transverse and vertical temperature gradients of the box girder change obviously at the junction of the internal cavity and the concrete. The overall temperature difference of box girder is smaller than the temperature difference limit in Chinese specifications.