Strengthening of Continuous Beams Using Fiber Reinforced Polymer Laminates

This paper is focused on the nonlinear finite element analysis of the reinforced high strength concrete continuous beam strength with carbon fiber reinforced polymer sheet. Three full scale continuous beams are analyzed under two points load; the data of analysis are compared with the experimental data provided by Akbarzadeh and Maghsoudi [1]. ANSYS V.11 program is used in FE analysis, the results obtained from analysis give good agreement with experimental result when compared load-deflection responses, ultimate strength, and the crack patterns. The results showed that with increasing the number of layers, the ultimate strength of beams are increase by amount reached (14%) for each layer. The failure mode different by increasing number of CFRP sheet layers when the beam strengthened by one layer of CFRP sheet failed by tensile rupture of CFRP sheet, and beam strengthened by more than one layer failed by intermediate crack (IC) debonding of CFRP sheet.

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Behavior of Reinforced Concrete Beams Strengthened in Negative Moment Region Using CFRP Plates

Aly

2023

Construction Technologies and Architecture

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One possible method for strengthening deteriorated concrete structures is to externally bond composite material plates to the concrete. The use of Carbon Fiber Reinforced Polymer (CFRP) laminates as an effective and versatile technique for strengthening reinforced concrete (RC) structures has developed into a sizable industry in recent years. To implement such rehabilitation, the nature of the bond between the composite plate and the concrete must be understood. The behavior of reinforced concrete beams strengthened in the negative moment region using CFRP strips is presented in this paper. The experimental program included strengthening and testing five half-scale, reinforced, simply supported rectangular cross section beams with an overhanging (cantilever) portion. One of the tested specimens was tested without any strengthening and considered as the control specimen. The rest specimens were strengthened with CFRP strips using different technique and then tested until complete failure. The effect of strengthening technique on deflection, failure load, strain, failure mode, and ductility are discussed. In addition, and due to local stress concentration at the plate ends, the influence of different type of CFRP fixation at both ends for proper bonding of the strips, and the strengthening pattern on the behavior of beams was examined. The ratio of absorbed energy at failure to total energy, or energy ratio, was used as a measure of beam ductility. The results generally indicate that the flexural strength of the strengthened beams is increased. It is also noted that, in addition to the longitudinal CFRP plates, the fiber oriented in the vertical direction forming a C or U-shape around the beam cross section significantly reduce beam deflections and increase beam load carrying capacity. However, all the strengthened beams experienced semi brittle failure, mandating a higher factor of safety in design. The results also indicate that plating reduced crack size in the beams and somewhat reduced their ductility.

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Strengthening of Continuous Beams Using Fiber Reinforced Polymer Laminates

Cited by 4 publications

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Innovative Triaxially Braided DuctileFRP Fabric for Strengthening Structures

Innovative Triaxially Braided DuctileFRP Fabric for Strengthening Structures

Nonlinear FE Analysis of Reinforced H.S. Concrete Continuous Beam Strengthened with CFRP Sheet

Behavior of Reinforced Concrete Beams Strengthened in Negative Moment Region Using CFRP Plates

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