悬索桥主缆温度场计算

研究目的:精确地计算悬索桥主缆各种状态下的温度场,对于悬索桥的架设至关重要.为此,在一些基本假设的基础上,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,主缆计算模型的热物性参数则采用了模型试验得到的结果.为了得到特定环境条件下的数值解,建立主缆温度场的计算方法及主缆热平衡矩阵方程.研究结论: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.

Calculation of Temperature Field of Main Cable of Suspension Bridge

Research purposes: To precisely calculate the temperature field of the main cable of suspension bridge under various states is crucial to erection of the suspension bridge.Therefore,on some basic assumptions,the thermal analysis model and unsteady heat conduction differential equation of the main cable are established to derive the solar heat radiation and heat convection boundary conditions.The result of the model test is used as the thermal physical parameters of the cable calculation model.In order to get the numerical solution under the specific environment conditions,the calculation method and thermal equilibrium matrix equation of the temperature field of the main cable are established. Research conclusions:The comparison of the finite element calculation result with the actually measured result of the temperature field of the main cable of the bridge shows this calculation method is precise and reliable and it is available for calculating the temperature field of the main cable of the suspension bridge in the courses of design,construction and service.