Shear Strengthening of T-beam with GFRP by Kishor Chandra Panda Sudhirkumar V. Barai & Sriman Kumar Bhattacharyya

Author:Kishor Chandra Panda, Sudhirkumar V. Barai & Sriman Kumar Bhattacharyya
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

The debonding of GFRP layer from the concrete surface is observed in the specimens S200-1L-CT-U-90, S200-2L-CT-U-90 and S200-3L-CT-U-90 as shown in Fig. 4.14c. It is observed during experimentation that at an ultimate load of 182 kN, the GFRP layer gets debonded in the specimen S200-1L-CT-U-90. The debonding gets initiated from the top surface of the web of the T-beams. The rupture failure of GFRP layer is also observed along the diagonal shear failure line. Whereas in specimens S200-2L-CT-U-90 and S200-3L-CT-U-90, the GFRP layer gets debonded from the concrete surface at 208 and 192 kN, respectively (Panda et al. 2012). These two specimens the debonding gets initiated from the top surface of the web only, no rupture failure is observed. An inclined crack is also appeared at the side of the flange of the T-beams from loading points, and it propagates a distance of about 185, 200 and 380 mm in S200-1L-CT-U-90, S200-2L-CT-U-90 and S200-3L-CT-U-90 specimens, respectively.

The failure modes of RC T-beams strengthened in shear with U-jacketed GFRP wrap clearly indicates that in single layer wrapping most of the failure is due to GFRP sheet rupture, whereas for two and three layers the failure is due to GFRP debonding.

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