本文關(guān)鍵詞：早期混凝土熱學(xué)參數(shù)優(yōu)化及溫度場(chǎng)精確模擬　出處：《四川大學(xué)學(xué)報(bào)(工程科學(xué)版)》2014年03期 　論文類(lèi)型：期刊論文

  更多相關(guān)文章： 早期混凝土 溫度場(chǎng) 水化度 遺傳算法 參數(shù)優(yōu)化

【摘要】：早期混凝土溫度場(chǎng)變化劇烈,其生熱過(guò)程、導(dǎo)熱性能都與水化過(guò)程密切相關(guān)。綜合混凝土絕熱溫升方程、熱學(xué)參數(shù)和邊界條件3個(gè)方面,進(jìn)行了早齡期混凝土熱學(xué)參數(shù)優(yōu)化和溫度場(chǎng)精確模擬的研究。在室內(nèi)試驗(yàn)基礎(chǔ)上,采用Python語(yǔ)言編寫(xiě)遺傳算法程序,并將二次開(kāi)發(fā)的ABAQUS溫度場(chǎng)子程序嵌入到遺傳算法中,進(jìn)行了絕熱溫升方程的參數(shù)優(yōu)化;考慮導(dǎo)熱系數(shù)和比熱變化,開(kāi)發(fā)了基于水化度的熱學(xué)參數(shù)子程序。采用優(yōu)化后絕熱溫升方程對(duì)某工程實(shí)例進(jìn)行了對(duì)比研究,結(jié)果表明:熱學(xué)參數(shù)變化對(duì)早期混凝土的溫度場(chǎng)分布有重要影響,考慮水化度熱學(xué)參數(shù)變化的工況比不考慮該參數(shù)變化的工況,承臺(tái)內(nèi)部溫度最高值增大7.28%,表面溫度最高值增大14.30%,內(nèi)外溫差增大3.81%,內(nèi)外溫差值較高的范圍也較大。研究成果能更為精確地預(yù)測(cè)結(jié)構(gòu)早期應(yīng)力和開(kāi)裂。
[Abstract]:The temperature field of early concrete varies dramatically, and its heat generation and thermal conductivity are closely related to the hydration process. The comprehensive adiabatic temperature rise equation of concrete, thermal parameters and boundary conditions are three aspects. The optimization of thermal parameters and accurate simulation of temperature field of early age concrete were studied. On the basis of indoor test, genetic algorithm was programmed by Python language. The secondary developed subprogram of ABAQUS temperature field is embedded into genetic algorithm to optimize the parameters of adiabatic temperature rise equation. Considering the variation of heat conductivity and specific heat, a subprogram of thermal parameters based on hydration degree is developed, and an engineering example is studied by using the optimized adiabatic temperature rise equation. The results show that the variation of thermal parameters has an important effect on the temperature field distribution of early concrete. The maximum value of the inner temperature of the cap increases 7.28%, the highest value of the surface temperature increases 14.30%, and the difference between inside and outside temperature increases 3.81%. The range of higher internal and external temperature difference is also large, and the research results can more accurately predict the early stress and cracking of the structure.
【作者單位】： 天津大學(xué)水利工程仿真與安全國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金創(chuàng)新研究群體科學(xué)基金資助項(xiàng)目(51021004);國(guó)家自然科學(xué)基金資助項(xiàng)目(51279126)
【分類(lèi)號(hào)】：TU528
【正文快照】： 早期混凝土經(jīng)歷了從流態(tài)、塑性到固態(tài)的變化過(guò)程,其溫度場(chǎng)變化劇烈。要精確模擬整個(gè)過(guò)程中溫度場(chǎng)的變化,必須同時(shí)考慮水化過(guò)程中混凝土的自生熱、熱交換、導(dǎo)熱等相關(guān)參數(shù)的變化。熱學(xué)參數(shù)的合理與否關(guān)系到溫度場(chǎng)結(jié)果的真實(shí)程度,其中,混凝土導(dǎo)熱系數(shù)、比熱等都隨時(shí)間、溫度等變

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