Abstract
This paper describes an experimental and theoretical analysis of strengthened damaged reinforced concrete corbel by gluing carbon fibre fabrics. The main objective of this study is to investigate the damage effect on the strengthening of reinforced concrete structures, especially on short reinforced concrete corbel and to propose an analytical model. Therefore, an experimental program was developed to evaluate the mechanical damaging effect on short corbels behaviour by using strain gauges. According to this program, five reinforced concrete corbels were tested under a three-point bending up to failure. Three of them were damaged at 45, 65 and 90 % of their ultimate load. After the specimens were repaired with carbon fibre fabrics and the loading was conducted till their failure. The fourth corbel which was not damaged. It was strengthened and tested until its collapse. The last one is the reference specimen corbel which was not reinforced. The test results with corbel specimens which were strengthened and unstrengthened are given. The significance to member performance is also explained. The measured load versus strain was too measured in the same way (with precision strain gauges) for others materials such as composite fibre fabrics, steel bar and concrete at the cross section of corbel. The study shows that the composite fibre fabrics using bonding technique could be a convenient and effective strengthening method for concrete structures. Thus, steel reinforcement and carbon fabrics played a major role in the repair of corbels. A theoretical analysis is presented describing the behaviour of strengthened damaged concrete corbel using the damage theory of reinforced concrete beams.
Highlights
The introduction of composite materials which has been used for 35 years in the field of Civil Engineering allows other techniques of strengthening of reinforced concrete structures by bonding composite carbon fibre fabrics Ivanova [1]
The results showed that damage has an effect on the ultimate load, less than 20 % of the ultimate load to 90 % of mechanical damage
This paper presents a study of damaged reinforced concrete corbels, where the corbels are strengthened by bonding carbon fibre fabrics
Summary
The introduction of composite materials which has been used for 35 years in the field of Civil Engineering allows other techniques of strengthening of reinforced concrete structures by bonding composite carbon fibre fabrics Ivanova [1]. Most of the structures in Civil Engineering fit the current safety standards or have excessive cracks. Assih et al Appl Adhes Sci (2015) 3:21. It is generally manifested by poor performance under service loading in the form of excessive deflections or cracking. The technique of strengthening compensates the loss of stiffness and cracking development. This technique improves the performance and durability of the structures
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