The article presents an experimental study on the influence of various end anchorage systems on the shear strengthening of reinforced concrete (RC) T-beams using externally bonded fibre reinforced polymer (EB-FRP) composites. Two different end anchorage techniques namely self-end anchorage (SEA) and sandwich anchorage (SWA) were used. This study mainly focussed on evaluating the effectiveness of these anchorages to eliminate the conventional fibre reinforced polymer (FRP) debonding failure. A total of twelve R.C. T-beams with different strengthening techniques using CFRP including control beams were used. The test results show improved shear strength and better energy dissipation over conventional technique; this authenticates the influence of end anchorage and its effectiveness in improving shear resistance. Also, the enhanced FRP strain at failure proves that the anchorage employed improves the efficacy of FRP strengthening in terms of ductility and damage tolerance.Keywords: CFRP strengthening, external bonded FRP, end anchorage, shear behaviour.MANY existing reinforced concrete (RC) structures in the world need reconstruction or strengthening because of ageing, lack of maintenance and up-gradation in code recommendations. Though conventional strengthening techniques such as RC jacketing, steel plate jacketing, ferrocement and fibre reinforced concrete strengthening [1][2][3][4] have been used, fibre reinforced polymer (FRP) wrapping has emerged as the most successful technique in recent years due to its ease and efficiency in construction practice. Strengthening of structural systems in India could be traced back from 1990s. Different types of fibre composites are available and the mechanical property of each material is unique as shown in Figure 1. Among the available fibre composites, GFRP and CFRP play a major role in strengthening with respect to their custom in industry. A single layer of CFRP can enhance the shear strength of a beam twice as compared with multiple layered GFRP composites as a result of its higher modulus.A review of FRP application in civil engineering 5 provides a detailed report on the strengthening works done in Indian railways using FRP such as Bata ROB-Kolkata A number of studies have been conducted on strengthening of RC elements using various FRP in the recent past [6][7][8][9][10][11] . The externally bonded FRP composites (EB-FRP) have been successfully used for upgrading the flexural, shear and axial load carrying capacities of RC elements. Many studies have focussed on the effect on shear strengthening of reinforced concrete (RC) elements [12][13][14][15][16] . Most of these studies [17][18][19][20][21] reported premature FRP debonding failure limiting the application of FRP on shear strengthening. In order to address this debonding failure many investigations have been done on different end anchorage systems using steel rod, steel plate and steel bolts as anchorage for FRP [22][23][24][25][26] . But these anchorage materials are prone to corrosion and not durable under seve...
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