| 李庆华,周宝民,黄博滔,徐世烺,应建坤.超高韧性水泥基复合材料抗压性能的尺寸效应研究[J].水利学报,2015,46(2): |
| 超高韧性水泥基复合材料抗压性能的尺寸效应研究 |
| The size effect of compressive properties of Ultra High Toughness Cementitious Composites（UHTCC） |
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| DOI： |
| 中文关键词: UHTCC 尺寸效应 高厚比 峰值应变 应力-应变模型 |
| 英文关键词: UHTCC size effect height-thickness ratio peak strain stress-strain model |
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| 中文摘要: |
| 超高韧性水泥基复合材料（Ultra High Toughness Cementitious Composites，简称UHTCC）是一种具有超高韧性和良好耐久性能的新型混凝土材料，能够有效控制水工结构中有害裂缝的发生，提高结构耐久性。本文对标准立方体和4组不同高厚比UHTCC 棱柱体试件的压缩性能进行了试验研究，得到了受压应力-应变全曲线。结果表明，UHTCC 抗压性能的尺寸效应规律有别于普通混凝土。抗压峰值应变（名义应变）与真实应变关系紧密，具有近似的比例关系；高厚比大于1 时，高厚比对UHTCC 棱柱体强度影响不大，有别于普通混凝土棱柱体试验结果；高厚比对UHTCC 棱柱体峰值应变有较大影响，在一定程度上反映了环箍效应的作用。最后，在试验结果与分析的基础上提出了一个适用于不同高厚比的UHTCC 压缩应力-应变模型。 |
| 英文摘要: |
| Ultra High Toughness Cementitious Composites（UHTCC） is a new type of concrete materials with high toughness and good durability. It can do well in controlling harmful cracks used in Hydraulic Structure and improve the durability of the structure. In this paper， the size effect of compressive properties of UHTCC has been discussed. During the test， experiments were carried out on UHTCC prism with different height-thickness ratio. The complete compressive stress-strain curves for different ratio of height to thickness have been obtained. Experimental results show that there is an approximate proportional relationship between the compressive peak strain （nominal strain） and the true strain. Different from ordinary concrete prism test results， the ratio of height to thickness has little effect on the strength of UHTCC prism. However， the height-thickness ratio has a great influence on the peak strain of UHTCC prism， which reflects the action of the hoop effect. Finally， based on the experimental results and analysis， we propose a compressive stress - strain model，applying to different height-thickness ratio. |
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