混凝土斜拉桥温度场的试验研究

Temperature Gradient Test and Research of RC Cable-Stayed Bridges

本文用实验手段和理论方法论述了混凝土斜拉桥温度场及其变化规律，分析了环境温度场与结构温度场的关系。运用富里埃（Ｆｏｕｒｉｅｒ）热传导理论，建立了混凝土斜拉桥结构温度场计算的二维差分方法，并在甬江斜拉桥的现场测试中得到了验证。在此基础上，将混凝土斜拉桥温度影响的计算简化为短期温差和长期温差作用下控制温度荷载的计算问题，提出了实用计算方法，经与实测结果比较，基本一致，并且偏于安全，完全适合于工程设计的要求。

Temperature gradients and temperature variation of RC cable-stayed bridges are discussed and the relation between environmental and structural temperature fields is analysed by testing and theoretical methods in this paper. With the Fourier Thermoduct Theory, the two-dimensional differential method, of structural temperature fields in RC cable-stayed bridges is found out, which is verified in the site test of Yong River CableStayed Bridge. On the basis of the test, the analysis of temperature effects on RC cablestayed bridges can be simplified to the calculation of the controlled temperature loads according to short-term or long-term temperature gradients. A simplified calculation method is also given in the paper. By comparison, the calculation values are essentially consistent with the measured values and in safety, and agree with the requirements in engineering design.