| 引用本文: | 马明,徐佰顺,张方,钱永久,李晓斌.持续荷载下CFRP-混凝土界面黏结性能试验与分析[J].哈尔滨工业大学学报,2018,50(3):128.DOI:10.11918/j.issn.0367-6234.201703086 |
| MA Ming,XU Baishun,ZHANG Fang,QIAN Yongjiu,LI Xiaobin.Experiment and performance analysis on bonding behavior of CFRP-concrete interface under sustained load[J].Journal of Harbin Institute of Technology,2018,50(3):128.DOI:10.11918/j.issn.0367-6234.201703086 |
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| 摘要: |
| 为研究持续荷载对CFRP(碳纤维增强复合材料)-混凝土界面粘结性能的影响，首先通过3组双面剪切试件确定了界面极限剥离荷载Pu，然后进行了4种荷载水平下持载时间分别为5、10、15、30、60、90 d共24组双剪试验.结果表明：经过持续荷载作用，与界面峰值剪应力τmax相应的界面滑移s0有所减小，减小幅度与荷载持续时间和荷载大小无明显相关，荷载作用90 d后，s0降低50%左右；当持续荷载大于0.5Pu时，靠近加载端15 mm范围内的界面峰值剪应力τmax随荷载大小和持载时间的增加而降低，此范围以外τmax未发生明显改变，基于试验数据，给出了持续荷载作用下界面的粘结滑移本构模型，对试件的破坏试验表明，在粘结长度大于有效粘结长度时，持续荷载的作用对界面的极限剥离荷载没有明显影响，但会降低剥离过程中界面首次出现剥离的荷载Pdb，在0.5Pu、0.7Pu、0.9Pu持续作用90 d后，Pdb分别降低了42%、54%、66%.
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| 关键词: CFRP-混凝土界面 粘结滑移关系 持续荷载 峰值剪应力 剥离荷载 |
| DOI：10.11918/j.issn.0367-6234.201703086 |
| 分类号:U448.22 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51508474) |
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| Experiment and performance analysis on bonding behavior of CFRP-concrete interface under sustained load |
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MA Ming,XU Baishun,ZHANG Fang,QIAN Yongjiu,LI Xiaobin
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(School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China)
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| Abstract: |
| To investigate the effects of sustained load on bonding properties of CFRP (Carbon Fiber Reinforced Polymer)-concrete interface, the ultimate debonding load of interface Pu was determined by three double shear specimens, and twenty-four double shear tests were performed under four load levels and four duration days of 5, 10, 15, 30, 60 and 90 for each load level. Results indicated that the interfacial slip s0 corresponding to the peak interfacial shear stress τmax was reduced under sustained load, but reduction magnitude shows an un-notable correlation with the duration and amplitude of load. The slip s0 reduces by about 50% after the load duration for ninety days. When the load is greater than 0.5Pu, the peak shear stress τmax closed to loading position ranging of 15 mm decrease with the increase of load level and duration, but exhibit un-notable changes in other position. Finally, the bond slip constitutive model of CFRP-concrete interface under sustained load was proposed based on these test data. The failure test showed that there was no significant effect of sustained load on the ultimate debonding load when the bonding length is greater than the effective bonding length, but the peeling load Pdb of interface during the first stripping in the debonding process was reduced due to the sustained load. When the loads of 0.5 Pu, 0.7 Pu, 0.9 Pu last for 90 days, the peeling loads Pdb reduce by 42%, 54%, 66% respectively.
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| Key words: CFRP-concrete interface bond-slip relationship sustained load peak shear stress debonding load |
