【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(jì)算中廣泛采用等效算法計(jì)算含有冷卻水管的大體積混凝土溫度場(chǎng)。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(lái),將水管冷卻視為負(fù)的水化熱。該方法主要存在兩個(gè)方面的缺陷:(1)不能精細(xì)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(diǎn),成為含冷卻水管的大體積混凝土溫度場(chǎng)和應(yīng)力場(chǎng)計(jì)算的新的精細(xì)算法。實(shí)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(jì)合理的冷卻方案,必須對(duì)這些參數(shù)進(jìn)行具體仿真分析。基于此點(diǎn),本論文采用熱流耦合算法對(duì)影響水管冷卻效果的水管參數(shù)進(jìn)行仿真分析,主要研究?jī)?nèi)容如下:(1)總結(jié)了目前大體積混凝土水管冷卻國(guó)內(nèi)外的研究現(xiàn)狀。(2)總結(jié)了溫度場(chǎng)計(jì)算原理以及幾種計(jì)算溫度場(chǎng)方法優(yōu)缺點(diǎn)。(3)在ANSYS平臺(tái)上,借助其參數(shù)化設(shè)計(jì)語(yǔ)言二次開(kāi)發(fā)出含冷卻水管的大體積混凝土溫度場(chǎng)仿真計(jì)算程序,并采用熱流耦合算法對(duì)影響水管冷卻效果的水管參數(shù)進(jìn)行仿真分析,得出這些參數(shù)對(duì)冷卻效果的定量影響。(4)結(jié)合具體工程實(shí)例,采用熱流耦合算法對(duì)傳統(tǒng)冷卻方式和小溫差通水冷卻進(jìn)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(yīng)力方面更具優(yōu)勢(shì)。
[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(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TV544

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉俊;李紅葉;張永濤;;水管冷卻動(dòng)態(tài)控制的時(shí)空效應(yīng)[J];水力發(fā)電學(xué)報(bào);2015年08期

2 強(qiáng)晟;吳超;朱振泱;;含冷卻水管的混凝土溫度場(chǎng)復(fù)合單元新算法[J];水利學(xué)報(bào);2015年06期

3 燕喬;張勝利;;基于ANSYS的冷卻水與混凝土對(duì)流換熱模擬研究[J];人民長(zhǎng)江;2015年05期

4 張超;段寅;劉杏紅;常曉林;;基于并層單元的大體積混凝土水管冷卻溫度場(chǎng)熱-流耦合精細(xì)計(jì)算[J];工程力學(xué);2014年12期

5 朱振泱;強(qiáng)晟;陳煒e，

本文編號(hào)：2293368