高速铁路槽形梁桥竖向温度分布模式研究

以沪昆高速铁路某槽形梁斜拉桥为工程背景,根据传热学和太阳物理学等相关理论,建立槽形梁横断面热力学分析模型,研究槽形梁内部的温度分布规律,探讨各类参数的影响,在此基础上提出日照作用下槽形梁横断面上温度分布模式。分析发现:不同时刻、大气透明度系数、混凝土表面辐射吸收率及梁高虽然会引起槽形梁温度场变化,但对槽形梁的竖向温差模式影响不大;槽形梁温差模式可按两部分进行拟合,截面顶缘温差22℃,采用指数函数和线性函数相结合模式进行拟合;下缘最大温差4℃,并线性变化至0℃。

Research on Vertical Temperature Distribution Mode of U-shape Beam on High-speed Railway

Based on the cable-stayed bridge with U-shape beam on the Shanghai-Kunming High-speed Railway and the relevant theories in respect of heat transfer and solar physics,a thermodynamics model of U-shape section is established to learn the mode of internal temperature distribution of the U-shape beam and access the influences of the parameters concerned. Based on the above,a sunshine temperature distribution curve for U-shape beam is proposed. The analysis shows that differences in time,coefficient of atmospheric transmission,surface absorption of radiation and height of the beam do give rise to the change of temperature field of U-type beam,but bring about less impact on the mode of vertical temperature difference; the modes of temperature difference of u-shape beam can be adapted in two parts with the maximum temperature difference of the upper part being 22 ℃ adapted with the combination of exponential function and linear function,and the maximum temperature difference of lower part being 4℃ reduced linearly to 0 ℃.