Influence of the Anchorage of PBO-FRCM Composites on the Effectiveness of Behaviour of Shearing Beams

Abstract:

The shear capacity of reinforced concrete beams strengthened with cement based composite materials (FRCM system) was investigated in this paper. The analysis refers to PBO-FRCM system made by PBO fibres (p-Phenylene Benzobis Oxazole) and cement based mortar. The use of cement mortar is connected with the slip phenomenon that occurs between the matrix layer and the fibres. This phenomenon leads to premature debonding of the ends of the composite and the loss of the shear capacity. To prevent this, designed end-anchorage systems is needed. Therefore, the laboratory tests on reinforced concrete beams strengthened in a shear with PBO-FRCM system were conducted. At this aim tests on three strengthened RC beams with different end-anchorages systems have been preformed and obtained results discussed. The experimental results revealed that the use of FRCM composites increased the shear capacity and construction of end-anchorage of composite had an impact on shear capacity.

• Periodical: Materials Science Forum (Volume 866)
• Pages: 129-133
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.866.129
• Online since: August 2016
• Authors: Dorota Urbańska, Tomasz Trapko, Michał Musiał*, Tomasz Kowalik
• Keywords: Anchorage, Beam, PBO-FRCM, Shear

References

[1] L. Ombres, Shear capacity of concrete beams strengthened with cement based composite materials, Proceedings of the 6th International Conference on FRP Composites in Civil Engineering. (CICE 2012), Roma, Italy (2012), Paper No. 01–281.

[2] L. Ombres, Structural performances of reinforced concrete beams strengthened in shear with a cement based fiber composite material, Compos Struct. 122 (2015) 316–329.

DOI: 10.1016/j.compstruct.2014.11.059

[3] T. Trapko, Behaviour of fibre reinforced cementitious matrix strengthened concrete columns under eccentric compression loading, Mater Design. 54 (2014) 947-954.

DOI: 10.1016/j.matdes.2013.09.008

[4] T.D. Antino, C. Carloni, L.H. Sneed, C. Pellegrino, Matrix–fiber bond behavior in PBO FRCM composites: A fracture mechanics approach, Engineering Fracture Mechanics. 117 (2014) 94-111.

DOI: 10.1016/j.engfracmech.2014.01.011

[5] D. Baggio, K. Soudki, M. Noël, Strengthening of shear critical RC beams with various FRP systems, Constr Build Mater. 66 (2014) 634-644.

DOI: 10.1016/j.conbuildmat.2014.05.097

[6] A. Brückner, R. Ortlepp, M. Curbach, Anchoring of shear strengthening for T-beams made of textile reinforced concrete (TRC), Mater Struct. 41 (2008) 407-418.

DOI: 10.1617/s11527-007-9254-9

[7] E. Tzoura and T. Triantafillou, Shear strengthening of reinforced concrete T-beams under cyclic loading with TRM or FRP jackets, Mater Struct. 49 (2016) 17-28.

DOI: 10.1617/s11527-014-0470-9

[8] T. Trapko, D. Urbańska, M. Kamiński, Shear strengthening of reinforced concrete beams with PBO-FRCM composites, Compos Part B-Eng, 80 (2015) 63-72.

DOI: 10.1016/j.compositesb.2015.05.024

[9] A. Modifi, O. Chaallal, B. Benmokrane, K. Neale, Preformance of end-anchorage systems for RC beams strengthened in a shear with epoxy-bonded FRP, ASCE J Compos Constr. 16 (2012) 322-31.

DOI: 10.1061/(asce)cc.1943-5614.0000263

[10] ASTM D3039/D3039M-14, Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials, ASTM International, West Conshohocken, PA. (2014).