【摘要】：水管冷卻是大體積混凝土最為有效、使用最為廣泛的溫控防裂措施,數(shù)值仿真計算中廣泛采用等效算法計算含有冷卻水管的大體積混凝土溫度場。該算法從平均意義上考慮水管冷卻的作用,即把水泥水化熱與水管冷卻效果等效起來,將水管冷卻視為負的水化熱。該方法主要存在兩個方面的缺陷:(1)不能精細模擬水管附近的混凝土溫度;(2)不能考慮冷卻水的沿程溫升。熱流耦合算法克服了等效算法的缺點,成為含冷卻水管的大體積混凝土溫度場和應力場計算的新的精細算法。實際工程中影響冷卻效果的水管參數(shù)有很多,為了找出既符合溫控要求,又經(jīng)濟合理的冷卻方案,必須對這些參數(shù)進行具體仿真分析�；诖它c,本論文采用熱流耦合算法對影響水管冷卻效果的水管參數(shù)進行仿真分析,主要研究內(nèi)容如下:(1)總結(jié)了目前大體積混凝土水管冷卻國內(nèi)外的研究現(xiàn)狀。(2)總結(jié)了溫度場計算原理以及幾種計算溫度場方法優(yōu)缺點。(3)在ANSYS平臺上,借助其參數(shù)化設計語言二次開發(fā)出含冷卻水管的大體積混凝土溫度場仿真計算程序,并采用熱流耦合算法對影響水管冷卻效果的水管參數(shù)進行仿真分析,得出這些參數(shù)對冷卻效果的定量影響。(4)結(jié)合具體工程實例,采用熱流耦合算法對傳統(tǒng)冷卻方式和小溫差通水冷卻進行仿真分析,結(jié)果表明采用小溫差冷卻方式能有效地降低水管徑向混凝土溫度梯度,并且在減小溫度應力方面更具優(yōu)勢。
[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.
【學位授予單位】：西安理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TV544

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本文編號：2293368