Abstract
The use of NSM FRP strengthening of concrete structures has become an attractive option to retrofit the existing structures against shear and flexure. This paper reviews only the utilization of NSM for shear in previous review articles. A database of tests of NSM strengthened beams in shear is presented to evaluate the existing design formulations of calculating the NSM contribution in shear. These formulations were in agreement with the experimental results in the database. Further research topics are also identified such as the shape of NSM FRP bars, combined effects of existing steel stirrups, and NSM FRP reinforcement and analytical formulations.
Highlights
Sudden failure because of low resistance to shear is something required to be avoided. us, one of the priorities of researchers is to find an appropriate strengthening technique that can be employed to enhance RC beams when they are deficiently reinforced in shear, when they fall under higher loads, or when the shear capacity of beam is below the flexural capacity due to flexural strengthening for example
Bonded (EB) Carbon Fiber Reinforced Polymer (CFRP) is one of the earlier systems used in strengthening concrete elements in the case of using composite materials [1,2,3,4,5,6,7]
Using near surface mounted (NSM) with CFRP becomes one of the most investigated techniques in flexural [8,9,10,11,12,13,14] and shear strengthening [15,16,17,18,19,20,21] because of its advantages over externally bonded Externally bonded (EB)-CFRP reinforcement [18, 22]: (1) e previous experimental studies have demonstrated that the NSM strengthening technique can provide higher strengthening effectiveness compared to EBR due to higher bonded area-to-cross-sectional area of the CFRP element ratio
Summary
Sudden failure because of low resistance to shear is something required to be avoided. us, one of the priorities of researchers is to find an appropriate strengthening technique that can be employed to enhance RC beams when they are deficiently reinforced in shear, when they fall under higher loads, or when the shear capacity of beam is below the flexural capacity due to flexural strengthening for example. Bonded (EB) Carbon Fiber Reinforced Polymer (CFRP) is one of the earlier systems used in strengthening concrete elements in the case of using composite materials [1,2,3,4,5,6,7]. (1) e previous experimental studies have demonstrated that the NSM strengthening technique can provide higher strengthening effectiveness compared to EBR due to higher bonded area-to-cross-sectional area of the CFRP element ratio. For this reason, the NSM technique is less prone to debonding failure. The design rules for prediction of the CFRP contribution of the NSM shear strengthening systems are evaluated
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