本文選題：大體積混凝土　切入點(diǎn)：水化熱　出處：《長(zhǎng)沙理工大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：近年來(lái),橋梁工程中的大體積混凝土結(jié)構(gòu)也應(yīng)用越來(lái)越廣泛。大體積混凝土結(jié)構(gòu)因?yàn)槌叽巛^大,從混凝土澆筑到混凝土凝固這段時(shí)間,水泥發(fā)生的水化反應(yīng)所產(chǎn)生的熱量不容易散發(fā)且加上混凝土的自身的特點(diǎn)與外界條件等情況,容易使結(jié)構(gòu)內(nèi)產(chǎn)生較大的拉應(yīng)力,從而導(dǎo)致結(jié)構(gòu)產(chǎn)生裂縫。本文在總結(jié)國(guó)內(nèi)外學(xué)者研究成果的基礎(chǔ)上,對(duì)大體積混凝土水化熱進(jìn)行分析及對(duì)溫度控制措施的相關(guān)因素進(jìn)行研究,以對(duì)類(lèi)似工程提供參考。本文的主要工作內(nèi)容有：(1)本文介紹了大體積混凝土結(jié)構(gòu)的定義、特點(diǎn)、橋梁工程上的應(yīng)用已經(jīng)國(guó)內(nèi)外的研究現(xiàn)狀；并從大體積混凝土的熱傳導(dǎo)理論出發(fā),對(duì)溫度場(chǎng)的有限元計(jì)算進(jìn)行了理論推導(dǎo),同時(shí)混凝土材料各因素對(duì)于水化熱的影響進(jìn)行介紹,最后對(duì)于控制混凝土的絕熱溫升提供參考意見(jiàn)。(2)通過(guò)總結(jié)學(xué)者的研究成果,從精心設(shè)計(jì)、合理的方法優(yōu)化混凝土的配合比、選擇合適的施工方法、采取有效的控溫措施以及混凝土結(jié)構(gòu)的表面保溫措施等方面的共同作用下才能夠更好地控制大體積混凝土的內(nèi)部溫度,更好的預(yù)防大體積混凝土產(chǎn)生裂縫。(3)利用MIDAS CIVIL有限元軟件對(duì)赫章特大橋混凝土承臺(tái)的水化熱和溫度控制進(jìn)行研究分析,并對(duì)其實(shí)測(cè)溫度進(jìn)行對(duì)比研究分析,得到結(jié)果吻合較好。這說(shuō)明通過(guò)有限元建模對(duì)于模擬分析承臺(tái)的效果較好。(4)本文還在此基礎(chǔ)上對(duì)分層澆筑塊法進(jìn)行了研究分析,得到了其方法對(duì)防止溫度裂縫的產(chǎn)生也是行之有效的。同時(shí)還對(duì)水管冷卻方式的各個(gè)因素進(jìn)行對(duì)比總結(jié),得到水管冷卻各參數(shù)對(duì)于溫控的規(guī)律,并對(duì)溫控合理規(guī)劃設(shè)計(jì),防止裂縫產(chǎn)生。
[Abstract]:In recent years, mass concrete structures in bridge engineering have been used more and more widely. The heat produced by the hydration reaction of cement is not easy to emit, and the characteristics of concrete and the external conditions, etc., which make the tensile stress in the structure easy to be produced. On the basis of summarizing the research results of domestic and foreign scholars, this paper analyzes the hydration heat of mass concrete and studies the relevant factors of temperature control measures. This paper introduces the definition and characteristics of mass concrete structure, and the application of bridge engineering has been studied at home and abroad. Based on the heat conduction theory of mass concrete, the finite element calculation of temperature field is theoretically deduced. At the same time, the influence of various factors of concrete material on hydration heat is introduced. Finally, for the control of adiabatic temperature rise of concrete to provide reference advice. 2) through summing up the research results of scholars, from careful design, reasonable method to optimize the mix ratio of concrete, select the appropriate construction method, Under the joint action of effective temperature control measures and surface insulation measures of concrete structure, the internal temperature of mass concrete can be better controlled. Using MIDAS CIVIL finite element software, the hydration heat and temperature control of concrete cap of Hezhang super bridge are studied and analyzed, and the measured temperature is compared and analyzed. The results are in good agreement with each other. This shows that the finite element modeling is better for simulating and analyzing the cap.) on this basis, the layered pouring block method is also studied and analyzed in this paper. The method is also effective to prevent temperature cracks. At the same time, the factors of water pipe cooling mode are compared and summarized, and the rules of water pipe cooling parameters for temperature control are obtained, and the reasonable planning and design of temperature control are obtained. Prevent cracks from occurring.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U445.57

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本文編號(hào)：1573339