| 引用本文: | 刘军,张宝东,赵冰洁,李根群,邓永刚.纤维类型及取向对纤维-UHPC基体拔出性能影响研究[J].材料科学与工艺,2022,30(3):36-43.DOI:10.11951/j.issn.1005-0299.20210242. |
| LIU Jun,ZHANG Baodong,ZHAO Bingjie,LI Genqun,DENG Yonggang.Study of effects of fiber types and orientations on pull-out properties of fiber-UHPC matrix[J].Materials Science and Technology,2022,30(3):36-43.DOI:10.11951/j.issn.1005-0299.20210242. |
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| 摘要: |
| 纤维与基体之间的粘结能力和机械锚固作用是基体将荷载传递给纤维的决定因素之一,不同类型的纤维和取向在拉拔时的受力形式和破坏形式决定试件承载能力。采用单根纤维拉拔试验探究了纤维类型、取向对超高性能混凝土(UHPC)界面拉伸性能的影响。结果表明:随着纤维取向的增加拔出荷载先增大后减小,在45°时拔出荷载达到最大值；随着纤维取向增加,纤维拔出时对基体破坏面积增大,纤维拔出时对于基体的破坏能力:波纹线>端勾型>直线型。由第一峰值荷载分析,波纹型钢纤维相比于直线型和端勾型钢纤维更容易脱黏。对纤维拔出时进行力学行为分析,波纹型钢纤维和端勾型钢纤维拔出过程中首先发生纤维屈服,随着荷载持续基体产生破坏,直线型钢纤维在拔出过程中最先发生纤维与基体脱黏。 |
| 关键词: 粘结能力 纤维取向 破坏形式 第一峰值荷载 脱黏 纤维屈服 |
| DOI：10.11951/j.issn.1005-0299.20210242 |
| 分类号:TU 528 |
| 文献标识码:A |
| 基金项目:国防基础科研计划项目. |
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| Study of effects of fiber types and orientations on pull-out properties of fiber-UHPC matrix |
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LIU Jun, ZHANG Baodong, ZHAO Bingjie, LI Genqun, DENG Yonggang
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(School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, China)
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| Abstract: |
| The bonding ability and mechanical anchorage between fibers and matrix is one of the determinants of the load transfer from the matrix to the fibers, and the forms of force and damages for different fiber types and orientations during pull-out determine the load carrying capacity of specimens. In this study, the effects of fiber types and orientations on the tensile properties of ultra-high performance concrete (UHPC) interfaces were investigated using single fiber pull-out tests. Results show that with increasing fiber orientations,the pull-out load first increased and then decreased, and it reached the maximum value at 45°.With the increase in the fiber orientations, the damage area of the matrix increased when the fibers were pulled out, and the damage capacity of the matrix when the fibers were pulled out was: corrugated type>end-hook type>linear type.According to the first peak load analysis, corrugated steel fibers were more likely to debond compared with linear and end-hook steel fibers. The mechanical behaviors during fiber pull-out were analyzed.It was found that fiber yielding occurred first during the pull-out of corrugated and end-hooked steel fibers, and damage occurred to the matrix as the load continued;linear steel fibers were the first to debond from the matrix during pull-out. |
| Key words: bonding ability fiber orientation, damage form first peak load debonding fiber yielding |
