| 早龄期混凝土蠕变模型比较 |
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| 引用本文： | 夏成俊,陈朝晖,陈珂,陈科.早龄期混凝土蠕变模型比较[J].重庆建筑大学学报,2016,38(1):61-68. |
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| 作者姓名： | 夏成俊 陈朝晖 陈珂 陈科 |
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| 作者单位： | 重庆大学 土木工程学院 重庆 400045,重庆大学 土木工程学院 重庆 400045;重庆大学 山地城镇建设与新技术教育部重点实验室 重庆 400045,重庆大学 土木工程学院 重庆 400045,重庆大学 材料科学与工程学院, 重庆 400045 |
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| 基金项目： | 中央高校基本科研业务费科研专项(CDJZR12245501) |
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| 摘 要： | 针对早龄期混凝土的蠕变松弛特性,以配比、强度以及不同加载龄期的混凝土蠕变试验数据为依据,对比研究了CEB-FIP模型、Muller模型、B3模型与笔者所建立变系数四参数Burgers模型的蠕变预测差异。研究结果表明:常用经验模型中,CEB-FIP模型具有较好的适应性,Muller模型对于高强混凝土的蠕变预测较好,基于固化理论的B3模型对于早龄期混凝土的蠕变预测值偏大,准确性较差。对比研究验证了变系数四参数Burgers模型中参数的物理意义与经验取值范围及其合理性与适用性。
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| 关 键 词： | 早龄期 混凝土 蠕变 粘弹性 水化过程 Burgers模型 |
| 收稿时间： | 2015/8/20 0:00:00 |
Comparison of creep models for early-age concrete |
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| Xia Chengjun,Chen Zhaohui,Chen Ke and Chen Ke.Comparison of creep models for early-age concrete[J].Journal of Chongqing Jianzhu University,2016,38(1):61-68. |
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| Authors: | Xia Chengjun Chen Zhaohui Chen Ke and Chen Ke |
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| Affiliation: | School of Civil Engineering, Chongqing University,School of Civil Engineering, Chongqing University;Key Laboratory of New Technology for Construction of Cities in Mountain Area in Chongqing University, Ministry of Education,School of Civil Engineering, Chongqing University and School of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China |
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| Abstract: | Based on creep relaxation properties of the early-age concrete and concrete creep experimental data of different proportions strengths and loading age conditions, we carried out a comparative study of models for predicting creep CEB-FIP model, Muller model, B3 model and the presented Burgers model. The results show that, the CEB-FIP model has the best adaptability; Muller model is good for the creep prediction of high strength concrete; and the B3 model, which is based on the solidification theory, overestimates the creep for early-age concrete and shows poor accuracy. The results of the comparative study verify the physical significance and experience data range of parameters, as well as the rationality and applicability of the presented Burgers model with variable coefficient and four parameters. |
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| Keywords: | early-age concrete creep viscoelastic hydration process burgers model |
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