混凝土箱梁桥日照温度场的实测与仿真分析

通过对某大型混凝土箱梁桥温度场的观测,分析了混凝土箱梁在日照辐射作用下的温度变化情况和竖向温度梯度的分布规律,发现日照辐射作用下混凝土箱梁竖向温度梯度模式近似服从指数分布。建立了基于气象参数的混凝土箱梁日照温度场有限元模型,并验证了该模型的准确性。最后,计算了50年一遇气象参数条件下混凝土箱梁竖向温度梯度分布情况,结果表明,极端条件下混凝土箱梁竖向最大温差可达18.5℃。

Measurement and Simulation Analysis for the Solar Temperature Field of Concrete Box Girder Bridge

The law of temperature change and vertical temperature gradient distribution of the concrete box girder were studied, according to the measured temperature data of one large concrete box girder bridge, the result shows that the vertical temperature gradient distribution of the concrete box girder nearly obeys index distribution. A finite element model of solar temperature field of concrete box girder based on meteorological parameters is established and the accuracy of the model is verified. Finally, the tem- perature gradient distribution of the concrete box girder is analyzed with the meteorological parameter standard values of 50 - year and the extreme temperature difference can reach 18.5 ℃.