發(fā)布時(shí)間：2019-01-14 17:28

【摘要】：實(shí)際工程中混凝土結(jié)構(gòu)的劣化失效通常是多重破壞因素耦合作用的結(jié)果,根據(jù)單一因素作用研究分析混凝土結(jié)構(gòu)耐久性問題難以準(zhǔn)確反映工程實(shí)際。因此,建立模擬真實(shí)服役環(huán)境-應(yīng)力狀態(tài)下的多因素耦合試驗(yàn)方法,研究多因素耦合作用下混凝土結(jié)構(gòu)性能的破壞機(jī)理、退化規(guī)律及防護(hù)措施具有十分重要的意義。 本課題主要是針對(duì)壓荷載與凍融循環(huán)耦合作用下混凝土耐久性的問題進(jìn)行研究的。通過試驗(yàn)研究壓荷載和凍融循環(huán)間相互耦合作用致使混凝土劣化的過程,并在此基礎(chǔ)上對(duì)損傷失效過程進(jìn)行分析并建立相關(guān)數(shù)學(xué)模型。其過程如下： 1.在快速凍融循環(huán)條件下進(jìn)行受壓混凝土抗凍耐久性研究時(shí)。作者對(duì)分別加了0、30%、60%極限壓強(qiáng)度荷載的混凝土試件進(jìn)行快速凍融循環(huán)試驗(yàn),結(jié)果發(fā)現(xiàn),加載快速凍融循環(huán)條件下的未加載試件比一般快速凍融循環(huán)條件下的未加載試件其內(nèi)部損傷情況要小。 2.在暴露條件下進(jìn)行受壓混凝土抗凍耐久性的研究時(shí)。作者對(duì)分別加了極限壓強(qiáng)度0、30%、60%荷載的混凝土試件進(jìn)行暴露試驗(yàn),研究并對(duì)比分析了暴露條件下受不同壓力混凝土試件內(nèi)部的損傷變化趨勢(shì)。結(jié)果發(fā)現(xiàn),經(jīng)過相同時(shí)間暴露試驗(yàn)下的混凝土,加載的力越大越有利于其抗壓強(qiáng)度的增長,同時(shí)在一定范圍內(nèi)又越不利于其抗拉強(qiáng)度的增長。 3.在測(cè)試暴露條件下受壓混凝土動(dòng)彈性模量時(shí),提出了失水率的概念,并且建立了以測(cè)試時(shí)混凝土相對(duì)動(dòng)彈性模量的測(cè)試值、失水率及溫度為未知量的三元函數(shù)修正方程和在一般快速凍融循環(huán)試驗(yàn)時(shí)不同荷載下混凝土試件相對(duì)動(dòng)彈性模量的修正公式。 4.以哈爾濱市為參考,找出了我國北方寒冷地區(qū)暴露于室外的混凝土結(jié)構(gòu)在一個(gè)特定時(shí)間內(nèi)共經(jīng)歷的凍融循環(huán)次數(shù)。
[Abstract]:The deterioration failure of concrete structure in practical engineering is usually the result of the coupling of multiple failure factors. It is difficult to accurately reflect the engineering practice by studying and analyzing the durability of concrete structure based on single factor. Therefore, it is of great significance to establish a multi-factor coupling test method to simulate the real service environment and stress state, and to study the failure mechanism, degradation law and protective measures of concrete structure under multi-factor coupling. The purpose of this paper is to study the durability of concrete under the coupling of compression load and freeze-thaw cycle. The process of concrete deterioration caused by the coupling of compression load and freeze-thaw cycle is studied through experiments. Based on this, the damage failure process is analyzed and the relevant mathematical model is established. The process is as follows: 1. Under the condition of rapid freeze-thaw cycle, the durability of compressive concrete is studied. The authors have carried out rapid freeze-thaw cycle tests on concrete specimens which have been subjected to 60% ultimate compressive load respectively, and the results show that, The internal damage of unloaded specimens under loading rapid freeze-thaw cycles is smaller than that of unloaded specimens under general rapid freeze-thaw cycles. 2. The frost durability of compressive concrete was studied under exposed conditions. The authors carried out exposure tests on concrete specimens with a limit compressive strength of 0 30% and 60% load respectively, and compared and analyzed the internal damage trends of concrete specimens under different pressures under exposure conditions. The results show that the higher the loading force is, the more favorable the compressive strength is to the concrete under the same time exposure test, and the more unfavorable to the increase of the tensile strength in a certain range. 3. When testing dynamic elastic modulus of compressive concrete under exposure condition, the concept of water loss rate is put forward, and the measured value of relative dynamic elastic modulus of concrete in test is established. The modified equation of three-dimension function with unknown water loss rate and temperature and the modified formula of relative dynamic elastic modulus of concrete specimen under different loads under general rapid freeze-thaw cycle test. 4. Taking Harbin as a reference, the freeze-thaw cycles of concrete structures exposed to outdoor in the cold area of northern China were found out in a given time.
【學(xué)位授予單位】：哈爾濱工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU528

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張亦濤,方永浩,鄭波;荷載與其它因素共同作用下混凝土耐久性研究進(jìn)展[J];材料導(dǎo)報(bào);2003年09期

2 方永浩;張亦濤;章凱;肖婷;;彎曲荷載對(duì)硬化水泥漿體和砂漿碳化過程的影響[J];材料導(dǎo)報(bào);2004年10期

3 余紅發(fā),慕儒,孫偉,繆昌文;彎曲荷載、化學(xué)腐蝕和碳化作用及其復(fù)合對(duì)混凝土抗凍性的影響[J];硅酸鹽學(xué)報(bào);2005年04期

4 貢金鑫,趙國藩;鋼筋混凝土結(jié)構(gòu)耐久性研究的進(jìn)展[J];工業(yè)建筑;2000年05期

5 巴恒靜,張武滿,鄧宏衛(wèi);評(píng)價(jià)高性能混凝土耐久性綜合指標(biāo)——抗氯離子滲透性及其研究現(xiàn)狀[J];混凝土;2005年09期

6 亢景富,馮乃謙;水工混凝土耐久性問題與水工高性能混凝土[J];混凝土與水泥制品;1997年04期

7 嚴(yán)安,李啟令,吳科如;高性能混凝土在荷載作用下的凍融性能及其可靠性分析[J];混凝土與水泥制品;2000年03期

8 李偉文,張根亮,劉江山;荷載作用下混凝土氯離子滲透性研究 第一部分:研究現(xiàn)狀和研究方法[J];中國建材科技;2002年03期

9 金祖權(quán),孫偉,張?jiān)粕?劉志勇;荷載作用下混凝土的碳化深度[J];建筑材料學(xué)報(bào);2005年02期

10 曹雪玲,劉軍祥,王偉,管自強(qiáng),司馬軍,杜衛(wèi)兵,楊旭輝;水下鋼筋混凝土結(jié)構(gòu)應(yīng)變測(cè)試方法[J];人民黃河;2003年04期

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