Strengthening concrete beams for shear with CFRP sheets |
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| Affiliation: | 1. Department of Civil Engineering, American University of Sharjah, Sharjah, United Arab Emirates;2. Department of Civil Engineering, United Arab Emirates University, Al-Ain, United Arab Emirates;1. Department of Civil Engineering, Isfahan University of Technology (IUT), Isfahan, Iran;2. Department of Civil Engineering, Ferdowsi University of Mashhad, Mashhad, Iran;1. Faculty of Civil Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Viet Nam;2. Faculty of Civil Engineering, Ho Chi Minh City Open University, 35-37 Ho Hao Hon, District 1, Ho Chi Minh City, Viet Nam;3. Centre for Infrastructural Monitoring and Protection, School of Civil and Mechanical Engineering, Curtin University, Kent St, Bentley, WA 6102, Australia;4. Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Viet Nam |
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| Abstract: | The method of strengthening concrete structures with FRP composites has existed for over a decade; the most common way to strengthen structures is in bending, but also wrapping of columns is quite common. There are also needs for strengthening concrete structures in shear, for example concrete beams, slabs, columns, etc. A typical structure can be a parking garage. However, strengthening concrete structures for shear is not as common as for bending and confinement. This paper presents examples to strengthen concrete beams for shear. First traditional strengthening methods are presented briefly, then the use of CFRP (Carbon Fibre reinforced Polymers) composites for shear strengthening is presented. Tests on beams strengthened in shear with CFRP sheets are presented and a short presentation on how to design for shear strengthening with CFRP is given. Furthermore, a field application of a parking slab strengthened for shear with CFRP unidirectional fabric is presented. The laboratory tests show the importance of considering the principal directions of the shear crack in relation to the unidirectional fibre. The field application shows that it is easy to strengthen existing structures for shear with CFRP fabrics. |
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