Shear Performance of Embedded Through Section (ETS) Over Near Surface Mounting (NSM) Method of RC Beams
- 178 Downloads
Reinforced concrete structures often have to face modifications in performance during their service life mainly because of ageing and exposure to aggressive environment. Near Surface Mounting (NSM) and Embedded Through-Section (ETS) are two effective techniques for the shear strengthening of reinforced concrete (RC) beams. NSM technique involves cutting of a series of shallow grooves in the concrete cover of the structures and inserting steel/FRP bars into them and ETS technique consists of drilling holes across the full depth of the beam cross-section and inserting steel/FRP bars into them, thereby bonding the bars with the surrounding concrete using appropriate bonding material. This paper presents the results of experimental investigations on RC beams strengthened in shear using CFRP bars in Embedded through section (ETS) and Near Surface Mounting (NSM) methods. Three point bending tests are conducted to find the effect of ETS/NSM bar spacing and ETS/NSM bar orientation on the load carrying capacity of RC beams. The experimental results confirms the effectiveness of ETS and NSM methods and a comparison is made in terms of shear strengthening ratio, load carrying capacity of RC beams.
KeywordsNear surface mounting (NSM) Embedded through-section (ETS) CFRP bars Shear strengthening ratio
- 1.Adhikary BB, Mutsuyoshi H (2006) Shear strengthening of reinforced concrete beams using various techniques. Constr Build Mater 20:366–373Google Scholar
- 2.Bilotta A, Ceroni F, Nigro E, Pecce M (2015) Efficiency of CFRP NSM strips and EBR plates for flexural strengthening of RC beams and loading pattern influence. Compos Struct 124:163–175Google Scholar
- 4.Mofidi A, Challal O, Benmokrane B, Neale K (2012) Experimental tests and design model for RC beams strengthened in shear using the embedded through section FRP method. J Compos Constr 16:540–550Google Scholar
- 7.Barros JAO, Dalfre GM (2012) Assessment of the effectiveness of the embedded through-section technique for the shear strengthening of reinforced concrete beams. Strain-An Int J Exp Mech 49:75–93Google Scholar