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(1 同濟(jì)大學(xué)建筑工程系， 上海 200092； 2 同濟(jì)大學(xué)先進(jìn)土木工程材料教育部重點(diǎn)實(shí)驗室， 上海 200092； 3 華東建筑設(shè)計研究院有限公司， 上海 200011； 4 上海同吉建筑工程設(shè)計有限公司， 上海 200092)
［摘要］超長混凝土墻體在降溫、收縮等過程中，溫度收縮應(yīng)力超過混凝土的抗拉強(qiáng)度是引起墻體開裂的重要原因。以“地基上的長墻”作為計算模型，利用溫度應(yīng)力和預(yù)壓應(yīng)力在離開端部較遠(yuǎn)處為均布應(yīng)力的假定，推導(dǎo)了預(yù)應(yīng)力與溫度、混凝土收縮共同作用下的墻體中應(yīng)力計算公式。并用有限元軟件ABAQUS進(jìn)行了大量計算，驗證了理論公式的可靠性和精確性。在應(yīng)力計算公式的基礎(chǔ)上，用極限變形的概念推導(dǎo)了裂縫間距的計算公式，此間距可作為施工縫和后澆帶間距的計算依據(jù)。最后，根據(jù)后澆帶的間距計算得到了一般情況下預(yù)應(yīng)力筋的合理分段長度，可為今后超長混凝土墻體結(jié)構(gòu)的理論分析和工程實(shí)踐提供參考。
［關(guān)鍵詞］超長； 混凝土墻體； 溫度； 收縮； 裂縫控制； 預(yù)應(yīng)力
中圖分類號：TU375文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2016)230085-06
Calculation and analysis on prestressing action of the super-long concrete underground wall
Xiong Xueyu1, 2， Shen Xin1,3， Wang Jishu4
(1 Department of Building Engineering, Tongji University, Shanghai 200092, China; 2 Key Laboratory of Advanced Civil Engineering Materials(Tongji University),Ministry of Education, Shanghai 200092, China;3 East China Architectural Design & Research Institute Co., Ltd., Shanghai 200011, China; 4 Shanghai Tongji Building Engineering Design Co., Ltd., Shanghai 200092, China)
Abstract:In the process of cooling and shrinkage, temperature shrinkage stress of super-long concrete wall exceeding the tensile strength of concrete becomes an important reason for the cracking of the wall. “The long wall on the foundation” was taken as a model, it was also assumed that the temperature stress and pressure stress far from the ends are uniform stresses, then, wall stress calculation formula was deduced under the combined action of the prestress, temperature and concrete shrinkage. The finite element software ABAQUS was used to conduct a large number of calculations to verify the reliability and accuracy of the theoretical formula. Based on the formula of stress calculation, the calculation formula of crack spacing was derived by using the concept of limit deformation, further the spacing of construction joint or post casting strip could be calculated. Finally, according to the spacing calculation of the post casting strip, the reasonable subsection length of the pre-stressed reinforcement was obtained for general condition. It can provide reference for the theoretical analysis and engineering practice of the super-long concrete wall structures in the future.
Keywords:super-long； concrete wall； temperature； shrinkage； crack control； prestress
*上海市科學(xué)技術(shù)委員會科研計劃項目（16DZ1201602），上?，F(xiàn)代建筑設(shè)計（集團(tuán)）有限公司研究項目（11-1類-0016-結(jié)），上海市科學(xué)技術(shù)委員會科研計劃項目（16DZ1201602）。
作者簡介：熊學(xué)玉，博士，教授，博士生導(dǎo)師，Email：xiong_xueyu@#edu.cn。
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