Finite Element Modeling of Strengthened Beams Using CFRP

Abstract

Deteriorating and damage of some structural elements influence negatively their strength and the bearing capacity. However, it is necessary to take some measures improve structural performance. In this context, the composite material is often used to strengthen the damaged parts. This paper presents a model to analyze the effect of carbon fiber reinforced polymer strengthening of beams under four point bending. Finite element software ANSYS 12.0 has been used for modeling the beams by conducting nonlinear static analysis. The SOLID 65 and SHELL 181 elements have been used to, respectively; model the 3D concrete beams and the composite layer. Constitutive properties of different components (concrete and FRP) have been incorporated. The predicted Finite element analysis results for the load-midspan deflection are compared to the measured experimental data. Close agreement was found between the predicted and measured results at all stages of loading for both models developed.

Torsion Behavior of Strengthened Reinforced Concrete Box Girders with Openings

“…Figure 9 represents the relationship between the torsional moment and the twisting angle for comparison between the control specimen (CB1) and the strengthened box girders, whether with longitudinal or Ushaped steel strips of 1 mm thickness: beams of group (3). The use of longitudinal strengthening resisted the propagation of cracks, which led to a reduction in the bitch and led to a change in the direction of the cracks laterally as shown Fig.…”

“…The technical details required to complete the work differ according to the strengthening material used. The method and type of material used will also be affected by the importance of the structure, the possibility of stopping its use or not, and the suitability of the conditions surrounding the operation process [1][2][3][4][5][6][7][8][9].…”