基于热流耦合算法的大体积混凝土水管冷却仿真计算研究
发布时间：2018-10-25 10:00
【摘要】：水管冷却是大体积混凝土最为有效、使用最为广泛的温控防裂措施,数值仿真计算中广泛采用等效算法计算含有冷却水管的大体积混凝土温度场。该算法从平均意义上考虑水管冷却的作用,即把水泥水化热与水管冷却效果等效起来,将水管冷却视为负的水化热。该方法主要存在两个方面的缺陷:(1)不能精细模拟水管附近的混凝土温度;(2)不能考虑冷却水的沿程温升。热流耦合算法克服了等效算法的缺点,成为含冷却水管的大体积混凝土温度场和应力场计算的新的精细算法。实际工程中影响冷却效果的水管参数有很多,为了找出既符合温控要求,又经济合理的冷却方案,必须对这些参数进行具体仿真分析。基于此点,本论文采用热流耦合算法对影响水管冷却效果的水管参数进行仿真分析,主要研究内容如下:(1)总结了目前大体积混凝土水管冷却国内外的研究现状。(2)总结了温度场计算原理以及几种计算温度场方法优缺点。(3)在ANSYS平台上,借助其参数化设计语言二次开发出含冷却水管的大体积混凝土温度场仿真计算程序,并采用热流耦合算法对影响水管冷却效果的水管参数进行仿真分析,得出这些参数对冷却效果的定量影响。(4)结合具体工程实例,采用热流耦合算法对传统冷却方式和小温差通水冷却进行仿真分析,结果表明采用小温差冷却方式能有效地降低水管径向混凝土温度梯度,并且在减小温度应力方面更具优势。
[Abstract]:Water pipe cooling is the most effective and widely used temperature control and crack prevention measure for mass concrete. The equivalent algorithm is widely used in numerical simulation to calculate the temperature field of mass concrete with cooling water pipe. In this algorithm, the effect of water pipe cooling is considered in the average sense, that is to say, the cement hydration heat is equivalent to the water pipe cooling effect, and the water pipe cooling is regarded as negative hydration heat. There are two main defects in this method: (1) the concrete temperature near the water pipe can not be simulated precisely; (2) the temperature rise along the cooling water can not be considered. The heat flux coupling algorithm overcomes the shortcomings of the equivalent algorithm and becomes a new fine algorithm for calculating the temperature field and stress field of mass concrete with cooling water pipe. There are many water pipe parameters that affect cooling effect in practical engineering. In order to find out the cooling scheme which not only meets the requirement of temperature control but also is economical and reasonable, it is necessary to carry out concrete simulation analysis on these parameters. Based on this point, the heat flux coupling algorithm is used to simulate and analyze the water pipe parameters which affect the cooling effect of water pipe. The main research contents are as follows: (1) the current research status of mass concrete pipe cooling at home and abroad is summarized. (2) the principle of temperature field calculation and the advantages and disadvantages of several methods for calculating temperature field are summarized. (3) on ANSYS platform, With the aid of its parameterized design language, a simulation program for the temperature field of mass concrete with cooling water pipes is developed, and the heat flow coupling algorithm is used to simulate and analyze the water pipe parameters that affect the cooling effect of water pipes. The quantitative effects of these parameters on cooling effect are obtained. (4) combined with practical engineering examples, the traditional cooling method and small temperature difference water cooling are simulated and analyzed by heat flux coupling algorithm. The results show that the small temperature difference cooling method can effectively reduce the radial concrete temperature gradient of the pipe, and it has more advantages in reducing the temperature stress.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV544
[Abstract]:Water pipe cooling is the most effective and widely used temperature control and crack prevention measure for mass concrete. The equivalent algorithm is widely used in numerical simulation to calculate the temperature field of mass concrete with cooling water pipe. In this algorithm, the effect of water pipe cooling is considered in the average sense, that is to say, the cement hydration heat is equivalent to the water pipe cooling effect, and the water pipe cooling is regarded as negative hydration heat. There are two main defects in this method: (1) the concrete temperature near the water pipe can not be simulated precisely; (2) the temperature rise along the cooling water can not be considered. The heat flux coupling algorithm overcomes the shortcomings of the equivalent algorithm and becomes a new fine algorithm for calculating the temperature field and stress field of mass concrete with cooling water pipe. There are many water pipe parameters that affect cooling effect in practical engineering. In order to find out the cooling scheme which not only meets the requirement of temperature control but also is economical and reasonable, it is necessary to carry out concrete simulation analysis on these parameters. Based on this point, the heat flux coupling algorithm is used to simulate and analyze the water pipe parameters which affect the cooling effect of water pipe. The main research contents are as follows: (1) the current research status of mass concrete pipe cooling at home and abroad is summarized. (2) the principle of temperature field calculation and the advantages and disadvantages of several methods for calculating temperature field are summarized. (3) on ANSYS platform, With the aid of its parameterized design language, a simulation program for the temperature field of mass concrete with cooling water pipes is developed, and the heat flow coupling algorithm is used to simulate and analyze the water pipe parameters that affect the cooling effect of water pipes. The quantitative effects of these parameters on cooling effect are obtained. (4) combined with practical engineering examples, the traditional cooling method and small temperature difference water cooling are simulated and analyzed by heat flux coupling algorithm. The results show that the small temperature difference cooling method can effectively reduce the radial concrete temperature gradient of the pipe, and it has more advantages in reducing the temperature stress.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV544
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