摘要
基于传热学理论,以某特大悬索桥为背景,采用试验测试得到了主缆结构的表观热扩散系数与表观导热系数。在采用测试参数的基础上,建立主缆的热分析模型和非稳态热传导微分方程,推导太阳热辐射和热对流边界条件,特别是针对主缆在太阳辐射边界条件下的情况,分析得到了一套主缆温度场的普适计算方法。通过对某桥梁主缆温度场的有限元计算及与实桥主缆温度场实测结果的对比,证明了计算方法与试验结果的精确和可靠,可用于悬索桥主缆设计、施工和运营阶段的温度场计算。
Based on the heat transfer theory, taking a large suspension bridge as background, we obtained the apparent thermal diffusion coefficient and apparent thermal conductivity coefficient of the main cable structure by test. On the basis of adopting test parameters, we established the thermal analysis model and the unsteady heat conduction differential equation of the main cable structure. Through deriving solar heat radiation and heat convection boundary conditions, especially in the circumstance that the main cable structure is under the condition of solar radiation boundary, we analyzed and obtained a set of pervasive computing method about the main cable temperature field. By finite element calculating the main cable temperature field about the study bridge and comparing it with the measured result of the real bridge, it is proved that both calculation method and experimental result are accurate and reliable, which can be used in the temperature field calculations for design, construction and operational phases of main cable structure of suspension bridge.
出处
《公路交通科技》
CAS
CSCD
北大核心
2015年第8期66-71,共6页
Journal of Highway and Transportation Research and Development
基金
安徽省自然科学基金项目(1308085QE85)
关键词
桥梁工程
悬索桥
热扩散系数
主缆
导热系数
太阳辐射
非稳态
热传导
bridge engineering
suspension bridge
thermal diffusion coefficient
main cable
thermal conductivity coefficient
solar radiation
unsteady state
heat conduction
