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| 商品混凝土收缩应力试验研究 | |
| 引用本文： | 吕艳梅,刘立新,徐有邻.商品混凝土收缩应力试验研究[J].东南大学学报(自然科学版),2005,35(Z1):144-148. |
| 作者姓名： | 吕艳梅 刘立新 徐有邻 |
| 作者单位： | 1. 湖南大学土木工程学院,长沙,410082 2. 郑州大学土木工程学院,郑州,450002 3. 中国建筑科学研究院,北京,100013 |
| 基金项目： | 国家混凝土结构设计规范资助项目 |
| 摘 要： | 针对商品混凝土早期弹性模量是个变量,难以通过测其收缩应变直接得出收缩应力这一问题,提出了收缩应力的计算方法.通过量测81个配筋试件和素混凝土试件,从拆模起到180 d龄期内的收缩值,得到其各自的收缩应变.素混凝土试件可以自由收缩;配筋试件由于钢筋的约束,不能自由收缩,导致配筋试件比素混凝土试件收缩应变要小.利用配筋试件与素混凝土试件的收缩应变差值和钢筋混凝土间的拉压平衡条件,推导给出商品混凝土收缩应力计算公式和收缩应力时随曲线,并对收缩应力的影响因素进行了分析. |
| 关 键 词： | 商品混凝土 收缩应力 试验研究 |
| 文章编号： | 1001-0505(2005)增刊(Ⅰ)-0144-05 |
| 修稿时间： | 2005年5月16日 |
Experimental study on shrinkage stress of commercial concrete |
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| Lü Yanmei,Liu Lixin,Xu Youlin.Experimental study on shrinkage stress of commercial concrete[J].Journal of Southeast University(Natural Science Edition),2005,35(Z1):144-148. | |
| Authors: | Lü Yanmei Liu Lixin Xu Youlin |
| Abstract: | Early age elastic modulus of commercial concrete is a variable,so it is impossible to infer shrinkage stress directly from its shrinkage strain.A calculation method for shrinkage stress is proposed in this paper.Through the measurement of 81 commercial reinforced concrete and plain concrete shrinkage samples from removal of shuttering till 180 d age,various shrinkage strain were obtained.Plain concrete specimens could shrink freely,while reinforced concrete specimens could not.So,the shrinkage strain of reinforced concrete specimens was smaller than that of plain concrete specimens.Based on the dispersion of shrinkage strain between reinforced concrete and plain concrete specimens,as well as the equilibrium condition between concrete tension and reinforcement compression,the shrinkage stress calculation formula and shrinkage stress-time curve of commercial concrete are proposed.In addition,influential factors of shrinkage stress are analyzed. |
| Keywords: | commercial concrete shrinkage stress experimental research |
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