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基于有限元热流耦合精细算法进行大体积混凝土施工期温度场仿真分析,真实反映水管附近的温度梯度和水管水温沿程的变化,采用基于粒子迁徙的粒群算法对Dittus-Boelter方程进行参数识别,使之适用于描述冷却水流的强制对流特性。在通用有限元软件ABAQUS平台上,开发热流耦合用户子单元,以官地碾压混凝土重力坝某一浇筑块为例验证热流耦合算法和用户子单元的可靠性和合理性。计算结果表明:精细算法能真实反映混凝土浇筑块的温度场,同时基于精细算法得到的施工期应力略大于等效算法。
Based on the finite element heat flow coupling algorithm, the temperature field in bulk concrete during construction is simulated and analyzed. The temperature gradient near the water pipe and the variation of the water temperature along the pipe are reflected. The particle swarm optimization algorithm is used to identify the parameters of Dittus-Boelter equation, Make it suitable for describing forced convection characteristics of cooling water flow. On the common finite element software ABAQUS platform, the heat flow coupling user subunit is developed. The reliability and rationality of heat flow coupling algorithm and user subunits are verified by taking a pouring block of Guandia RCC gravity dam as an example. The calculation results show that the precise algorithm can reflect the temperature field of concrete pouring block truly, and the stress during construction period obtained based on the fine algorithm is slightly larger than the equivalent algorithm.