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针对混凝土箱梁墩顶块在施工浇筑过程中的早期开裂现象,基于最小目标原理,建立了混凝土箱梁水化热评价模型;在水化绝热温升模型的基础上,采用大型通用软件ANSYS,对正常浇筑模式下和3层浇筑模式下混凝土箱梁墩顶块水化热温度场进行三维数值仿真,得到水化热场温度峰值和温差峰值时程曲线,并将3层浇筑与正常浇筑模式进行了对比分析以及优化评价。研究结果表明:3层浇筑方式能够改善混凝土水化热温度峰值,但对缩小温差峰值不明显;热场评价模型能够准确地反映浇筑方式的合理性,评判其温度峰值与温差值的差异性。
According to the principle of minimum target, the hydration heat evaluation model of concrete box girder is established. Based on the model of hydration adiabatic temperature rise, a large common software ANSYS is used to analyze the normal cracking of normal concrete box girder piers. Pouring mode and three-layer pouring mode of concrete box girder pier heat hydration temperature field three-dimensional numerical simulation, hydration heat field peak temperature and temperature peak time history curve, and the three layers of pouring and normal pouring mode Comparative analysis and optimization evaluation. The results show that the three-layer pouring method can improve the peak temperature of hydration heat of concrete, but the peak value of shrinking temperature is not obvious. The thermal field evaluation model can accurately reflect the rationality of pouring method and judge the difference between temperature peak value and temperature difference value.