简支铁路箱梁与轨道结构温度场仿真分析
Simulation analysis of temperature field of simply-supported railway box girder and track structure

针对目前我国高速铁路中普遍采用的32 m简支箱梁与CRTS II型无砟轨道结构,基于传热学基本理论,考虑太阳辐射与对流换热,采用ANSYS有限元软件建立箱梁-无砟轨道温度场仿真分析模型,分析整个结构在典型时刻的温度分布特征,并研究无砟轨道板、箱梁顶板、腹板和底板等典型位置处的温度随时间变化规律。基于温差最大时刻的结构温度分布,根据温度场数值仿真模型计算结果,拟合得到无砟轨道结构和无遮盖部分箱梁的竖向温度梯度分布模式,可为我国典型地区CRTS II型无砟轨道的温度应力计算提供参考。
In view of the 32 m simply-supported box girders and the CRTS II type ballastless track structure which have been largely adopted in the high-speed railway in China, the box girder-ballastless structure simulation analysis model was established through the ANSYS finite element software. The model was based on the heat transfer theory, and the solar radiation and the convection heat transfer have been taken into consideration as well. The structure temperature distribution characteristics at typical time were analyzed in this paper. In addition, the temperature changing law with time at the positions including the ballastless track slab, box girder’s top plate, web and bottom plate was studied. Based on the structure temperature distribution when the temperature difference is largest and according to the calculation results, the vertical temperature modes of the ballast structure and the box girder have been presented, which could provide some useful information for the temperature stresses calculation of the CRTS II type ballastless track in the typical region