Bond-Slip Relationship for CFRP Sheets Externally Bonded to Concrete under Cyclic Loading.
Bond-Slip Relationship for CFRP Sheets Externally Bonded to Concrete under Cyclic Loading.
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循环荷载下外部粘结至混凝土的 CFRP 板的粘结滑移关系
DOI：
10.3390/ma11030336
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发表时间：
2018-02-26
期刊：
影响因子：
--
通讯作者：
Zhu J
中科院分区：
文献类型：
--
作者：
Li K;Cao S;Yang Y;Zhu J
本文通过试验和分析相结合的方法，研究了循环荷载作用下碳纤维布与混凝土之间的粘结滑移关系。为了了解静力和循环荷载作用下的粘结滑移关系，进行了改进的梁试验。试验变量为碳纤维布与混凝土的宽度比和碳纤维布的粘结长度。本文的试验结果和已有的试验结果分析表明，粘结滑移曲线上升段的斜率随着循环次数的增加而减小，但对应于最大剪应力的滑移量几乎不随循环次数的增加而变化。此外，在循环荷载作用下，粘结滑移曲线上升区的斜率随混凝土强度的增大而减小，随荷载水平或CFRP与混凝土宽度比的增大而增大。然而，如果剩余键长大于有效键长，则这些变化不受键长变化的影响。在已有的静力粘结滑移模型的基础上，建立了循环荷载作用下CFRP片材与混凝土粘结滑移的双线性模型，该模型考虑了循环荷载水平、混凝土强度和CFRP与混凝土比的影响。通过与试验结果的比较，验证了该模型的准确性。
The objective of this paper was to explore the bond–slip relationship between carbon fiber-reinforced polymer (CFRP) sheets and concrete under cyclic loading through experimental and analytical approaches. Modified beam tests were performed in order to gain insight into the bond–slip relationship under static and cyclic loading. The test variables are the CFRP-to-concrete width ratio, and the bond length of the CFRP sheets. An analysis of the test results in this paper and existing test results indicated that the slope of the ascending segment of the bond–slip curve decreased with an increase in the number of load cycles, but the slip corresponding to the maximum shear stress was almost invariable as the number of load cycles increased. In addition, the rate of reduction in the slope of the ascending range of the bond–slip curve during cyclic loading decreased as the concrete strength increased, and increased as the load level or CFRP-to-concrete width ratio enhanced. However, these were not affected by variations in bond length if the residual bond length was longer than the effective bond length. A bilinear bond–slip model for CFRP sheets that are externally bonded to concrete under cyclic loading, which considered the effects of the cyclic load level, concrete strength, and CFRP-to-concrete ratio, was developed based on the existing static bond–slip model. The accuracy of this proposed model was verified by a comparison between this proposed model and test results.
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影响因子：
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作者：
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