本文選題：混凝土T型梁　切入點(diǎn)：水化熱溫度　出處：《東北林業(yè)大學(xué)》2014年碩士論文

【摘要】：隨著中國國民經(jīng)濟(jì)持續(xù)穩(wěn)定的增長,交通運(yùn)輸業(yè)蓬勃興起,需要修建的橋梁數(shù)量巨大,橋梁建設(shè)行業(yè)空前的繁榮。在眾多的橋型中,預(yù)應(yīng)力混凝土T型梁橋以其結(jié)構(gòu)剛度大、抗扭能力強(qiáng)、整體性好、行車平順等突出優(yōu)點(diǎn)常被選為最佳橋型方案。但是近年來,國內(nèi)外的許多預(yù)應(yīng)力混凝土連續(xù)T型梁橋在使用過程中均出現(xiàn)了不同程度的裂縫。這一現(xiàn)象引起了國內(nèi)外橋梁專家和科研人員的重視,這些學(xué)者證明了橋梁結(jié)構(gòu)產(chǎn)生裂縫的主要原因是溫度應(yīng)力�；炷翆�(dǎo)熱性能較差,在溫度效應(yīng)作用下,橋梁結(jié)構(gòu)產(chǎn)生較大溫差,容易產(chǎn)生溫度裂縫,影響橋梁的耐久性和安全性。 本文以內(nèi)蒙古寶貝河大橋預(yù)應(yīng)力混凝土連續(xù)T型梁橋?yàn)檠芯繉?duì)象,對(duì)試驗(yàn)梁的溫度數(shù)據(jù)進(jìn)行了觀測,獲得了大量的實(shí)測溫度數(shù)據(jù)。以試驗(yàn)梁實(shí)測溫度數(shù)據(jù)為依據(jù),分別對(duì)混凝土水化熱作用與日照溫度作用下的試驗(yàn)梁溫度分布模式進(jìn)行了分析。研究了截面尺寸、砼入模溫度對(duì)水化熱溫度分布的影響。 以傳熱學(xué)理論為基礎(chǔ),使用大型有限元軟件ABAQUS模擬混凝土T型梁在水化熱階段的熱量變化過程。采用《大體積混凝土溫度應(yīng)力與溫度控制》一書中給出的復(fù)合指數(shù)式,計(jì)算混凝土水化放熱量。通過模型計(jì)算值與現(xiàn)場實(shí)際測量的溫度值進(jìn)行對(duì)比,得出了適用于計(jì)算混凝土T型梁水化放熱量的參數(shù)a、b。運(yùn)用修正后的有限元模型,分析了混凝土T型梁水化熱溫度場的分布情況。
[Abstract]:With the sustained and steady growth of China's national economy, the transportation industry is booming, the number of bridges needed to be built is huge, and the industry of bridge construction is booming.Among the many bridge types, prestressed concrete T-beam bridge is often chosen as the best bridge type with its outstanding advantages such as large stiffness, strong torsional resistance, good integrity and smooth running.However, in recent years, many prestressed concrete continuous T-beam bridges at home and abroad have different degree of cracks in the process of use.This phenomenon has attracted the attention of bridge experts and researchers both at home and abroad. These scholars have proved that the main cause of cracks in bridge structure is temperature stress.The thermal conductivity of concrete is poor. Under the effect of temperature, the temperature difference of bridge structure is large, and the temperature crack is easy to occur, which affects the durability and safety of the bridge.This paper takes Prestressed concrete continuous T-beam bridge of Baohe Bridge in Inner Mongolia as the research object. The temperature data of the test beam are observed and a large number of measured temperature data are obtained.Based on the measured temperature data of the test beam, the temperature distribution model of the test beam under the action of hydration heat of concrete and sunshine temperature is analyzed respectively.The effect of cross section size and concrete injection temperature on the temperature distribution of hydration heat is studied.Based on the theory of heat transfer, a large-scale finite element software ABAQUS is used to simulate the heat change process of concrete T-beam in hydration heat stage.The heat release of concrete hydration is calculated by using the compound exponential formula given in the book "temperature stress and temperature Control of Mass concrete".Based on the comparison between the calculated values of the model and the temperature values measured in the field, the parameters a / b suitable for the calculation of the hydration heat release of concrete T-beams are obtained.Based on the modified finite element model, the distribution of temperature field of concrete T-beam hydration is analyzed.
【學(xué)位授予單位】：東北林業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441.5

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