基于Matlab的高强混凝土早龄期湿度变形计算方法
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摘要
以高强混凝土构件为例,建立了混凝土长方体构件在湿度场作用下早龄期收缩变形解析计算方法,采用松弛徐变系数法对混凝土徐变的影响作了修正。应用该模型,对不同环境湿度下的混凝土构件应变进行了计算分析。结果表明:混凝土应变变化与相对湿度变化规律一致;28d内混凝土内部相对湿度变化主要来自水化反应耗水;环境相对湿度为80%时,混凝土构件内部湿度先下降后上升。
Taking the high-strength concrete member as an example, an analytic method for the calculation of the early age shrinkage stress of the concrete member is developed in the present paper. Relaxation coefficient method is used for the calculation of concrete creep. Making use of the method, the effect of the environment humidity strain are calculated and analyzed The results show that the change of strain and humidity is consistent; the change of humidity in 28 d result from hydration reaction; when the relative humidity is 80%, the moisture inside the concrete member first decreased and then increased.
Taking the high-strength concrete member as an example, an analytic method for the calculation of the early age shrinkage stress of the concrete member is developed in the present paper. Relaxation coefficient method is used for the calculation of concrete creep. Making use of the method, the effect of the environment humidity strain are calculated and analyzed The results show that the change of strain and humidity is consistent; the change of humidity in 28 d result from hydration reaction; when the relative humidity is 80%, the moisture inside the concrete member first decreased and then increased.
引文
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[4]Zhang J,Qi K,Huang Y.Calculationofmoisture distribution in earlystage concrete[J].ASCE Journal of Engineering Mechanics,2009,135(8)871-880.
[5]Anton K.Schindler,Kevin J.Folliard.Heatof hydration models for cementitious materials[J].ACI Materials Journal,2005,102(1):24-33.
[6]Jensen OM.Autogenousdeformationand RH-change-self-desiccation and self-desiccation shrinkage[M].Denmark,The Technical University of Denmark,1993.
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[8]陈萌.混凝土结构收缩的机理分析与控制[D].武汉:武汉理工大学,2006.
[2]Kim Jk,Lee CS.Moisturediffusionofconcrete consideringselfdesiccation at early ages[J].Cement and Concrete Research.1999,28(8):1921-1927.
[3]侯东伟,混凝土自身与干燥收缩一体化及相关问题研究[D].北京:清华大学,2010.
[4]Zhang J,Qi K,Huang Y.Calculationofmoisture distribution in earlystage concrete[J].ASCE Journal of Engineering Mechanics,2009,135(8)871-880.
[5]Anton K.Schindler,Kevin J.Folliard.Heatof hydration models for cementitious materials[J].ACI Materials Journal,2005,102(1):24-33.
[6]Jensen OM.Autogenousdeformationand RH-change-self-desiccation and self-desiccation shrinkage[M].Denmark,The Technical University of Denmark,1993.
[7]Bazant ZP,Panula L.Practicalpredictionoftimedependentdeformation of concrete[J].Materials and Structures,Parts I and II,1978,11(65):307 328;Parts III and IV:1978,11(66):415434;Parts V and VI:1978,12(69):169―173.
[8]陈萌.混凝土结构收缩的机理分析与控制[D].武汉:武汉理工大学,2006.