| 引用本文: | 徐佰顺,姚亚东,钱永久,马明,宋帅.具有荷载作用历史的CFRP-钢界面粘结性能试验[J].哈尔滨工业大学学报,2020,52(9):167.DOI:10.11918/201905011 |
| XU Baishun,YAO Yadong,QIAN Yongjiu,MA Ming,SONG Shuai.Experiment on bonding behavior of CFRP-steel interface with load history[J].Journal of Harbin Institute of Technology,2020,52(9):167.DOI:10.11918/201905011 |
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| 具有荷载作用历史的CFRP-钢界面粘结性能试验 |
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徐佰顺1,姚亚东1,钱永久2,马明3,宋帅4
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(1.内蒙古大学 交通学院, 呼和浩特 010070;2.西南交通大学 土木工程学院, 成都 610031; 3.中交第一公路勘察设计研究院有限公司, 西安 710075;4.太原理工大学 建筑与土木工程学院, 太原 030024)
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| 摘要: |
| 为研究荷载作用历史对碳纤维增强复合材料（CFRP）加固钢结构界面粘结性能的影响,开展4种界面剪应力水平、6种持载时间的CFRP-钢双剪试件长期加载试验,对达到规定加载时间的试件进行静力拉伸破坏.根据CFRP轴向应变数据,给出了界面剪应力分布及粘结滑移曲线,考虑到界面蠕变损伤对粘结滑移本构关系的影响,在双线性模型中引入系数β、η、γ,回归分析得到了这3个系数的表达式.结果表明:胶黏剂的蠕变变形会引起界面应力重分布,随着时间的增加CFRP应变增大,界面剪应力峰值减小；加载90 d后,在12.5 mm处B组、C组、D组、E组试件界面剪应力分别减小了26.6%、59.2%、73.8%、85.4%；当界面剪应力水平较高时,应考虑界面蠕变损伤对粘结滑移曲线的影响,界面剪应力水平越高持续时间越长,蠕变损伤越显著；当CFRP粘贴长度大于有效粘结长度时,界面蠕变损伤对极限承载力没有明显影响. |
| 关键词: 钢结构 CFRP-钢界面 粘结性能 粘结滑移本构模型 极限承载力 蠕变损伤 |
| DOI：10.11918/201905011 |
| 分类号:TU391 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51778532)； 内蒙古大学高层次人才科研启动金(22200-5175156) |
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| Experiment on bonding behavior of CFRP-steel interface with load history |
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XU Baishun1,YAO Yadong1,QIAN Yongjiu2,MA Ming3,SONG Shuai4
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(1. Transportation Institute, Inner Mongolia University, Hohhot 010070, China; 2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 3. CCCC First Highway Consultants Co., Ltd., Xi’an 710075, China; 4. College of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China)
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| Abstract: |
| To investigate the effects of load history on the bonding properties of carbon fiber reinforced polymer (CFRP) steel interface, long-term loading tests of CFRP-steel plate double-lap specimens were conducted under four interfacial shear stress levels and six types on loading time, and static tensile tests were carried out on the specimens which reached the specified loading time. Based on the axial strain data of CFRP, the distribution of interfacial shear stress and bond-slip curves were given. In view of the effect of interfacial creep damage on the bond-slip constitutive relations, coefficients β, η, and γ were introduced into bilinear model, and corresponding expressions were obtained by regression analysis. Results show that the creep deformation of the adhesive caused the redistribution of the interfacial stress. With the increase of time, the peak value of interfacial shear stress decreased and the strain of CFRP increased. After loading for 90 days, the interfacial shear stress of the specimens in groups B, C, D, and E at 12.5 mm decreased by 26.6%, 59.2%, 73.8%, and 85.4%, respectively. When the level of interfacial shear stress was high, the influence of interfacial creep damage on bond-slip curves should be considered, where higher interfacial shear stress and longer duration led to more significant creep damages. When the bonding length of CFRP was longer than the effective bonding length, the interfacial creep damage had no obvious effect on its ultimate bond strength. |
| Key words: steel structure CFRP-steel interface bonding behavior bond-slip constitutive relations ultimate bond strength creep damage |
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