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

作者：Sasmal Saptarshi^*; Khatri Chandra Prakash; Ramanjaneyulu K; Srinivas V

来源：Construction and Building Materials, 2013, 40: 1097-1109.

DOI：10.1016/j.conbuildmat.2012.11.073

• Near surface mount
• CFRP
• Pull-out test
• Bond relations
• Non-linear finite element analysis

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.

• 出版日期2013-3