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箱形梁在夏季受强烈的太阳辐射作用,桥面温度急剧上升,经过热传导以后,一般顶板温度要比腹板和底板的温度高得多,产生较大的温度梯度。由于桥梁截面内的温度分布不均匀,温度高的部分要膨胀,受到温度低的部分的约束,因而产生纵向温度应力。在冬季,顶板因受雨雪影响,底板或腹板的温度有可能高于顶板,产生所谓倒梯度,但此种梯度要小得多,相应的温度应
Box girder in the summer by the strong solar radiation, the bridge temperature rose sharply, after heat conduction, the general roof temperature is much higher than the temperature of the web and the floor, resulting in a greater temperature gradient. Due to the non-uniform temperature distribution in the cross-section of the bridge, the high-temperature part expands and is restrained by the low-temperature part, resulting in longitudinal temperature stress. In winter, due to the influence of rain and snow on the roof, the temperature of the floor or web may be higher than the roof, resulting in the so-called inverted gradient, but the gradient is much smaller. The corresponding temperature