Abstract
Reinforced concrete (RC) structures are generally subjected to various load conditions and are susceptible to environmental impact. With time, most of these structures will be subjected to change in their usage. Unexpected increase in load changes may cause severe damage to the structural components, and eventual leading to various types of structural failure. It is noted that shear failure in nature is a sudden failure and should be avoided at all times. To increase its service life due to shear, structures can be strengthened or repaired using CFRP strips wrapped within the shear span (av) of the beam. Hence, this paper presents an investigation on the sustainable behaviour of two span continuous RC T-beams strengthened and repaired by wrapping Carbon Fibre Reinforced Polymer (CFRP) strips at intervals along the shear span (av) of the beam. The CFRP strips will be orientated in two directions either at 0°/90° or 45°/35°. Five beams, one control beam, two initially strengthened beams and two precracked and repaired beams were cast and cured in room temperature before testing. All T-beams were designed to fail in shear and are subjected to four-point bending test until failure. Upon completion of the test, all beam specimens shows good sustainable behaviour as the ultimate load and shear load shows an increase in capacity by up to 23% with improve ductile behaviour.
Highlights
Shear failure of Reinforced concrete (RC) beams is mainly caused by the formation of diagonal tension cracks within the web of the beam
The shear failure mechanism of RC beams are governed by a number of factors such as the compressive strength of concrete, effective depth of the beam (d), maximum aggregate size, and shear span to depth ratio
All beams were tested under a four-point bending test with shear span to effective depth ratio of 1.85
Summary
Shear failure of RC beams is mainly caused by the formation of diagonal tension cracks within the web of the beam. Other major characteristics of FRP include its high strength to weight ratio, it has non-conductive, non-corrosive and nonmagnetic properties and is resistant to chemical attack [3, 4] It has been reported by Alferjani et al [5], Ali et al [6] and Shahidan et al [7] that the application of the FRP composites has been proven to increase the service life contributing to the structures longevity. Another unique property of FRP is that it allows the material to be molded into various shapes and forms, facilitating its flexible use in construction. Application of FRP requires the use of additional bonding materials and adhesives, such as epoxy and resins [9], which are relatively expensive compared to traditional materials
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
