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Numerical evaluation of bond-slip relations for near-surface mounted carbon fiber bars embedded in concrete

机译：埋入混凝土中的近表面安装碳纤维杆粘结滑移关系的数值评估

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摘要

The present study deals with obtaining the bond relations for near surface mounted (NSM) CFRP bars embedded in concrete. The procedure for numerical simulation of pull-out tests with displacement control loading on NSM CFRP bars embedded in concrete has been presented to establish the bond relations. Parametric studies are performed considering various factors affecting the bonding of CFRP bar with concrete. Effect of tensile strength of epoxy adhesive filled in the groove to hold the CFRP bar and the influence of presence of ribs by varying the ribs diameter and ribs spacing are studied in the present investigations. Non-linear finite element models are developed by considering the parameters. It is found from the present study that as the ribs spacing decreases there is an increase in the bond strength, as the CFRP bar is more intact and uniform in the embedded system. But there is a drop in the bond strength when the ribs spacing is decreased beyond 0.8 times the diameter of the CFRP bar. Further, with the increase in epoxy strength there is a decrease in the bond strength as the ultimate failure takes place in concrete. It is worth mentioning that with the increase in ribs diameter, there is an increase in the bond strength but decrease in the corresponding slip. The numerical models proposed and the relations obtained are very helpful in developing the bond-slip models and would be useful in designing the CFRP based strengthening schemes.
机译：本研究致力于获得埋入混凝土中的近表面安装（NSM）CFRP钢筋的粘结关系。提出了对嵌在混凝土中的NSM CFRP筋进行位移控制荷载的拉拔试验数值模拟的程序，以建立粘结关系。考虑到影响CFRP筋与混凝土粘结的各种因素，进行了参数研究。在本研究中，研究了填充在沟槽中以保持CFRP筋的环氧树脂胶的拉伸强度的影响以及通过改变肋的直径和肋的间距对肋的存在的影响。通过考虑参数来开发非线性有限元模型。从本研究中发现，随着肋间距的减小，粘结强度会增加，这是因为CFRP筋在嵌入式系统中更加完整且均匀。但是，当肋间距减小到CFRP筋直径的0.8倍以上时，粘结强度就会下降。此外，随着环氧强度的增加，随着混凝土的最终破坏发生，粘结强度降低。值得一提的是，随着肋骨直径的增加，粘结强度增加，但相应的滑移减小。提出的数值模型和获得的关系对于建立粘结滑移模型非常有帮助，对于设计基于CFRP的加固方案很有用。

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