环境温度、日照时长以及太阳辐射强度是影响混凝土箱梁竖向温度梯度的重要参数。现行规范的温度梯度计算模式中并未考虑各地区之间差异显著的环境温度等热力学参数。为准确反映我国各地区间温度模式的差异，文中选取各个典型气候地区的代表城市，基于实时阴影技术，利用 ANSYS 建立了混凝土铺装、沥青混凝土铺装混凝土箱梁的热力学分析模型，对我国混凝土箱梁的日照实时温度场和竖向温度梯度进行研究。结果表明: 混凝土箱梁的最大竖向温度梯度出现在西安地区，其竖向温度梯度曲线可用指数函数和直线进行拟合; 我国现行公路规范中的竖向温度梯度与实际温度梯度分布有一定的差异，采用混凝土铺装的箱梁梁顶温度梯度取值偏大，采用沥青混凝土铺装的箱梁梁顶温度梯度取值偏小; 相比于混凝土铺装，9cm 厚的沥青混凝土铺装层能使箱梁的最大竖向正温度梯度上限值降低 4℃，下限值降低 3℃，出现时间延迟 2h。

Ambient temperature，sunshine duration，and solar radiation intensity are three important parameters af-fecting the vertical temperature gradient of the concrete box girder． However，the current code temperature gradient model does not consider the significant differences in environmental and thermodynamic parameters between re-gions． In order to accurately reflect the differences in temperature patterns across regions in China，the representa-tive cities of typical climate regions were selected． Based on real-time shadow technology，the thermodynamic ana-lysis model of concrete pavement and asphalt concrete pavement concrete box girder was established by ANSYS，and the real-time temperature field and vertical temperature gradient of the concrete box girder were studied． The study shows that the maximum vertical temperature gradient value of the concrete box girder appears in Xi'an，and its vertical temperature gradient curve can be fitted by exponential function and straight line． The distribution of vertical temperature gradient in China's current highway code differs from that of actual temperature gradient to some extent． In the code，the temperature gradient at the top of box beams using concrete paving is too large，and the temperature gradient at the top of box beams using asphalt concrete paving is too small． As compared with the con-crete pavement，the 9 cm-thickness asphalt concrete pavement can reduce the upper limit value of the maximum vertical positive temperature gradient of the box girder by 4 ℃，the lower limit value by 3 ℃ and the occurrence time by two hours．