發(fā)布時(shí)間：2018-05-25 20:19

  本文選題：高溫混凝土 + 冷卻方式　； 參考：《吉林建筑大學(xué)》2017年碩士論文

【摘要】：混凝土結(jié)構(gòu)在高溫作用下,由于組成混凝土的粗細(xì)骨料和水泥等膠結(jié)材料的熱工性不同,再加上其各組成成分間復(fù)雜的理化作用,使的混凝土力學(xué)性能差異很大。特別在我省寒冷干燥的氣候條件下,混凝土結(jié)構(gòu)在正常使用階段下的環(huán)境差異就較大,則對(duì)其在遭受高溫火災(zāi)后所表現(xiàn)出來(lái)的材料力學(xué)性能就更為復(fù)雜。本文借助于復(fù)合材料力學(xué)和混凝土斷裂力學(xué)的研究手段,以試驗(yàn)研究和有限元數(shù)值模擬為基礎(chǔ),揭示了我省混凝土材料在高溫火災(zāi)作用后力學(xué)性能的劣化規(guī)律及工作機(jī)理。其主要研究?jī)?nèi)容如下:1.搜集整理了國(guó)內(nèi)外關(guān)于混凝土火災(zāi)方面的大量文獻(xiàn)資料,對(duì)混凝土材料在高溫過(guò)火后的熱工性和熱力學(xué)性能進(jìn)行了系統(tǒng)的概括和總結(jié)。2.研究了混凝土材料在不同溫度、不同冷卻方式、不同靜置時(shí)間作用下的抗壓強(qiáng)度變化情況,建立了高溫后混凝土單軸受壓的本構(gòu)關(guān)系模型。3.根據(jù)試驗(yàn)數(shù)據(jù)進(jìn)行回歸分析,擬合出了無(wú)量綱下的抗壓強(qiáng)度、應(yīng)力-應(yīng)變、初始彈性模量、劈裂強(qiáng)度等力學(xué)性能參數(shù)與溫度、冷卻方式、靜置時(shí)間之間的耦合關(guān)系式。4.在試驗(yàn)的基礎(chǔ)上,利用已得出的熱工參數(shù),借助于ANSYS有限元計(jì)算軟件,對(duì)混凝土在不同高溫下的溫度場(chǎng)和熱-結(jié)構(gòu)耦合場(chǎng)進(jìn)行了有限元數(shù)值模擬,并通過(guò)混凝土在高溫下溫度場(chǎng)分布、溫度應(yīng)力分布、抗壓位移云圖、抗壓應(yīng)力云圖等對(duì)其材料性能做了進(jìn)一步的闡述。本課題的研究力求為本省混凝土結(jié)構(gòu)設(shè)計(jì)分析,以及抗火設(shè)計(jì)、火災(zāi)后的修復(fù)加固等提供更符合實(shí)際的計(jì)算模型和試驗(yàn)參數(shù)。
[Abstract]:Under the action of high temperature, the mechanical properties of concrete are greatly different due to the different thermal properties of the coarse aggregate and cement, and the complex physical and chemical action among the components. Especially in the cold and dry climate of our province, the environmental difference of concrete structure in the normal service stage is great, and the mechanical properties of the concrete structure after the high temperature fire are more complex. By means of composite mechanics and fracture mechanics of concrete, based on experimental research and finite element numerical simulation, this paper reveals the deterioration law and working mechanism of mechanical properties of concrete materials in our province after high temperature fire. The main research contents are as follows: 1: 1. A great deal of literature about concrete fire is collected and sorted out, and the thermal and thermodynamic properties of concrete after high temperature overfire are summarized and summarized systematically. The change of compressive strength of concrete under different temperature, different cooling methods and different static time is studied, and the constitutive relation model of uniaxial compression of concrete under high temperature is established. On the basis of regression analysis of test data, the coupling relationship between mechanical properties such as compressive strength, stress-strain, initial elastic modulus, splitting strength, temperature, cooling mode and static time is obtained. On the basis of the experiment, the temperature field and thermal-structure coupling field of concrete at different high temperatures are simulated by using the obtained thermal parameters and the finite element calculation software ANSYS. The material properties of concrete are further expounded through temperature field distribution, temperature stress distribution, compression displacement cloud diagram, compressive stress cloud diagram and so on. The research of this subject aims to provide more practical calculation model and test parameters for the design and analysis of concrete structure in this province, as well as for the design of fire resistance, repair and reinforcement after fire.
【學(xué)位授予單位】：吉林建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU528

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李文盛;;煤礦建筑中混凝土的應(yīng)用與其應(yīng)力設(shè)計(jì)與分析[J];煤炭技術(shù);2013年10期

2 閆振林;;混凝土應(yīng)力分析在煤礦建筑中的應(yīng)用研究[J];煤炭技術(shù);2013年11期

3 王光華;;混凝土的斷裂破壞機(jī)理分析[J];甘肅農(nóng)業(yè);2006年02期

4 馮波;張志誠(chéng);董霞;;混凝土應(yīng)力計(jì)算的變形法誤差分析及方法改進(jìn)[J];河海大學(xué)學(xué)報(bào)(自然科學(xué)版);2007年02期

5 鄔春蕊;;混凝土裂縫的成因與防治措施[J];中小企業(yè)管理與科技(下旬刊);2010年02期

6 林麗娟;;煤礦建筑中采用混凝土應(yīng)力分析[J];煤炭技術(shù);2012年07期

7 А.А.扎格略許基;混凝土o喼貧蔚某嘰縹侍鈁J];水力發(fā)電;1957年04期

8 王，

本文編號(hào)：1934543