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为了分析大体积混凝土浇筑后的水化热问题,建立了武汉火车站轨道梁的三维实体有限元模型。对其浇筑后192 h内的温度场进行计算,确定高温和高温度梯度区域,并与实测数据进行了对比。结果显示所建立的有限元模型能够较好地模拟实际混凝土温度场;混凝土内各点温度约48 h后达到峰值;各点最大温差不超过20℃;距梁端部1.5 m处竖直方向上的温度梯度最大。
In order to analyze the problem of hydration heat after mass concrete pouring, a three-dimensional solid finite element model of railroad track for Wuhan Railway Station was established. The temperature field within 192 h after pouring was calculated, and the high-temperature and high-temperature gradient areas were determined and compared with the measured data. The results show that the established finite element model can simulate the actual temperature field of concrete effectively; the temperature of each point in concrete reaches the peak value after about 48 h; the maximum temperature difference at each point does not exceed 20 ℃; in the vertical direction at 1.5 m from the end of the beam The temperature gradient is the largest.