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暴露在大气环境中的混凝土箱型梁不可避免受到局部温度作用的影响,其内部存在着非线性温度梯度,伴随温度荷载的持续作用,梁内温度场分布及其效应的发展演变过程较为复杂。通过人工控温模型试验及有限元分析方法,研究在局部升温情况下,混凝土箱型梁竖向及横向温度场及效应的时变特征和分布规律,对比分析不同热物理参数值对梁温度分布的影响。研究结果表明:局部温度作用下混凝土箱型梁的温度分布及其随作用时间的变化呈现一定的非线性特征,在持续时间作用内温度效应呈单调变化;增大比热容及导热系数能有效改善混凝土梁的温度分布。
The concrete box girders exposed to the atmosphere are inevitably affected by the local temperature. There is a nonlinear temperature gradient inside the box girder. With the continuous action of temperature load, the evolution and distribution of the temperature field in the beam and its effects are complicated. By means of artificial temperature model test and finite element analysis, time-varying characteristics and distribution of vertical and horizontal temperature field and effect of concrete box girder under local heating conditions are studied. The temperature distribution Impact. The results show that the temperature distribution of concrete box girder under local temperature shows a certain nonlinear characteristic with the change of working time, and the temperature effect changes monotonically with the duration of action. Increasing the specific heat capacity and thermal conductivity can effectively improve the concrete Beam temperature distribution.