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| 早龄期水泥混凝土拉伸徐变实测与模型 | |
| 引用本文： | 魏亚, 姚湘杰. 早龄期水泥混凝土拉伸徐变实测与模型[J]. 工程力学, 2015, 32(3): 104-109. DOI: 10.6052/j.issn.1000-4750.2013.09.0863 |
| 作者姓名： | 魏亚 姚湘杰 |
| 作者单位： | 清华大学土木工程系,土木工程安全与耐久教育部重点试验室,北京 100084 |
| 基金项目： | 国家自然科学基金项目(51108246); 交通运输部西部交通科技项目(2011318223710) |
| 摘 要： | 该研究研发了混凝土早龄期拉伸徐变测量装置,并能够测量直接拉伸强度和拉伸弹性模量。对测得的拉伸徐变进行模拟,采用现存模型对数据进行验证,认为现存模型不能够精确预测混凝土早龄期拉伸徐变。根据实测拉伸徐变数据对现存模型进行修正,建立了更能代表实际工程情况、用于混凝土结构物应力计算的拉伸徐变模型,提供了可用于结构物应力计算的松弛模量。 |
| 关 键 词： | 早龄期 拉伸徐变 直接拉伸强度 拉伸弹性模量 松弛模量 混凝土 |
| 收稿时间： | 2013-09-15 |
MEASUREMENT AND MODELING OF TENSILE CREEP OF EARLY-AGE CONCRETE |
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| WEI Ya, YAO Xiang-jie. MEASUREMENT AND MODELING OF TENSILE CREEP OF EARLY-AGE CONCRETE[J]. Engineering Mechanics, 2015, 32(3): 104-109. DOI: 10.6052/j.issn.1000-4750.2013.09.0863 | |
| Authors: | WEI Ya YAO Xiang-jie |
| Affiliation: | Key Laboratory of Civil Engineering Safety and Durability of China, Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China |
| Abstract: | This study developed a system for measuring tensile creep in early-age concrete. This system is capable of performing direct tensile strength and tensile elastic modulus measurements as well. The measured tensile creep of early-age concrete was simulated by using the existing model and it was found that the measured and predicted values did not agree well. A modified tensile creep model is provided based on the B3 model, and the relaxation modulus was calculated through a rheological model, allowing accurate predictions of stress and cracking potential in field structures. |
| Keywords: | early-age tensile creep direct tensile strength elastic tensile modulus relaxation modulus concrete |
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