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参照国内外 5种规范对温度梯度的规定 ,采用相同的升 (降 )温温差 ,对一大跨径连续刚构箱形梁桥的温度效应进行计算分析和比较 ,结果显示温度荷载在主梁下缘引起拉应力 ,它与混凝土张拉预应力筋引起的二次应力相组合 ,将产生较大的拉应力 ,从而降低主梁截面的抗裂性能 ,在设计计算时应予以高度重视。
With reference to the provisions of the five domestic and foreign standards for temperature gradient, the temperature effects of a long-span continuous rigid frame box girder bridge are calculated and analyzed by using the same temperature difference between rise and fall, and the results show that the temperature load on the main beam The tensile stress caused by the lower edge, which is combined with the secondary stress caused by the prestressing tendon in the concrete, will produce a larger tensile stress, thus reducing the crack resistance of the cross section of the main beam, which should be highly valued in the design and calculation.