Experimental and analytical investigations of reinforced concrete beams strengthened by different CFRP sheet schemes.

Abstract

The use of bonded externally polymer reinforced fiber (FRP) Laminates has been introduced as an effective approach in rehabilitating (RC) structures due to their high strength, corrosion resistance, reduced weight, and ease of use. This paper discusses the experimental results of the flexural reinforcement of RC beams by CFRP sheets bonded by epoxy adhesive to the tensile surface of the beams. Using a four-point bending load system over an effective clear length of 1800 mm, a total of ten beams with an overall dimension of 150 * 200 * 2000 with different degrees of strengthening schemes were constructed and tested. A numerical study using ANSYS finite element program was conducted by modeling RC beams. The number of layers, strengthening scheme (side and U-shape bonding) and reinforcement ratio are the major parameters of the experimental study. the research indicate that the flexural strength of the beams was substantially improved as the layers of laminate increased between 31.80 and 71.50 % and using U shape in ends delaying or preventing debonding failure. The result obtained using ANSYS model showed acceptable agreement with the experimental results, with deviations varying no more than 10 % for all specimens.

Finite element modeling of flexural behavior of reinforced concrete beams externally strengthened with CFRP sheets

“…he FE model was created to investigate the flexural behavior of RC beams reinforced with CFRP sheets [20] by Madqour et al Information on the RC beams is omitted and briefly summarized in the following.…”

“…A total of ten RC beam specimens strengthened with various schemes were tested by Madqour et al [20]. The specimens examined included a control beam (B01) reinforced with two steel bars with a diameter of 10 mm.…”

“…It also can predict and display the cracking and crushing patterns of the material. ANSYS 19.0 FE software is used to develop 3D FE specimen models tested by madqour et al [20]. The geometry, constituent material characteristics, loading, and boundary conditions of the FE models are similar to those of the tested beams previously described in Table 1.…”

“…A total of nineteen FE models were developed to study the flexural behavior of RC beams externally bonded with CFRP sheets. ten specimens were used to validate the accuracy of the numerical model by comparing it with experimental results by Madqour et al [20] and nine models were developed to investigate the effect of increasing CFRP sheets size.…”

Enhancing Flexural Performance of Self-Compacting Concrete Beams Using Fiber-Reinforced Polymer Composites

“…Continuing the work further, the observation was made on providing CFRP wrapping with two layers in U-shape scheme [43]. The beam was designated as ACW, and this beam attained an ultimate load of 92.67kN which represents strength gain of 75.48% compared to controlled beam.…”