Anchorage Length of Near-Surface Mounted Fiber-Reinforced Polymer Bars for Concrete Strengthening-Experimental Investigation and Numerical Modeling

Near-surface mounted (NSM) fiber-reinforced polymer (FRP) bars are being increasingly recognized as a valid alternative to externally bonded FRP laminates for enhancing flexural and shear strength of deficient concrete, masonry, and timber members. The ultimate capacity and service performance of strengthened members are deeply impacted by bond characteristics of the strengthening system on which, in the case of NSM bars, limited data is available. This paper follows up on prior investigations into the mechanics of bond of NSM bars to concrete. Experimental results completing a previous test series are reported and discussed, and a global evaluation of results of 3 different test series is attempted. A 3-D finite element model for bond of NSM reinforcement is proposed and calibrated on the basis of some experimental findings.