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本文通过在深圳地区实测混凝土试件内部的温度分布,得出竖向温度梯度除在梁顶部较大外,在梁底也存在局部升温,这与目前公路桥规中的规定不同。并通过某立交匝道3跨连续钢构曲线桥作为工程背景,比较分析了在试验测得的梯度温度分布模式与现行桥梁荷载规范规定的梯度温度模式作用下结构的力学性能,得出不同的梯度温度分布对箱梁主应力影响较大的结论。
In this paper, by measuring the temperature distribution inside concrete specimens in Shenzhen, it is concluded that there is a local temperature increase at the bottom of the beam, except that the vertical temperature gradient is larger at the top of the beam, which is different from the current regulations in highway bridges and bridges. And through an interchange ramp 3 continuous steel curved bridge as an engineering background, comparative analysis of the structure of the mechanical properties of the structure under the gradient temperature distribution mode of the test and the gradient load mode of the current bridge load specifications, draw different gradients The temperature distribution has a great effect on the main stress of box beam.