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为掌握大体积混凝土在龄期范围内的温度及应力分布,为某即建大桥承台施工提供合理、有效的调控措施,采用大型商用软件ANSYS对混凝土承台浇筑后七天内的温度场及温度应力进行数值模拟.结果表明:内部温峰出现在浇筑后的3.5 d左右,表面温峰则出现在第2 d,且先后浇筑的三层混凝土的温度场分布随龄期变化规律有较高的一致性;混凝土内部的最大温度应力出现在浇筑后的7 d,且高于当日混凝土抗拉强度,为避免早期裂缝的发生,在承台施工过程中需在混凝土内部埋设冷凝水管,且要对温度场及温度应力值进行监测.
In order to grasp the temperature and stress distribution of mass concrete in the age range, to provide reasonable and effective control measures for the construction of a platform of Zhujian Bridge, the large commercial software ANSYS was used to analyze the temperature field and temperature The results show that the internal temperature peak appears about 3.5 d after pouring, the surface temperature peak appears on the 2nd day, and the temperature distribution of the three layers of pouring concrete has a higher variation with age The maximum temperature stress inside the concrete appeared 7 d after pouring and higher than the tensile strength of the concrete on that day. In order to avoid the occurrence of early cracks, it is necessary to embed the condensate water pipe inside the concrete during the construction of the cap. Temperature field and temperature stress values are monitored.