Corroded RC beams patch repaired and strengthened in flexure with fiber-reinforced polymer laminates

2017 ◽  
Vol 112 ◽  
pp. 125-136 ◽  
Author(s):  
Garyfalia G. Triantafyllou ◽  
Theodoros C. Rousakis ◽  
Athanasios I. Karabinis
Keyword(s):  
Fiber Reinforced Polymer ◽  
Rc Beams ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Polymer Laminates

Analytical study on torsional behavior of concrete beams strengthened with fiber reinforced polymer laminates using softened truss model

2020 ◽  
pp. 136943322098169
Author(s):  
Muhanad M Majed ◽  
Mohammadreza Tavakkolizadeh ◽  
Abbas A Allawi
Keyword(s):  
Analytical Model ◽  
Computational Procedure ◽  
Fiber Reinforced Polymer ◽  
Rc Beams ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Truss Model ◽  
Torsional Behavior ◽  
Before And After ◽  
Polymer Laminates

This study aimed at evaluating the torsional capacity of reinforced concrete (RC) beams externally wrapped with fiber reinforced polymer (FRP) materials. An analytical model was described and used as a new computational procedure based on the softened truss model (STM) to predict the torsional behavior of RC beams strengthened with FRP. The proposed analytical model was validated with the existing experimental data for rectangular sections strengthened with FRP materials and considering torque-twist relationship and crack pattern at failure. The confined concrete behavior, in the case of FRP wrapping, was considered in the constitutive laws of concrete in the model. Then, an efficient algorithm was developed in MATLAB environment to accomplish the analysis, solve the appropriate equations, and calculate the torsional moment and angle of twist at all points. The parametric study considered the effect of effective fiber strain to reach a better prediction for the full torsional behavior. The model was able to predict the torsional behavior of the RC beams strengthened with FRP materials before and after cracking stages with reasonable accuracy.

Analysis of process-induced deformation on the spring-in of carbon fiber-reinforced polymer thin laminates

2019 ◽  
Vol 53 (20) ◽  
pp. 2901-2907 ◽  
Author(s):  
Andrea Corrado ◽  
Wilma Polini
Keyword(s):  
Carbon Fiber ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Cure Process ◽  
Reinforced Polymer ◽  
Numerical Tool ◽  
Carbon Fiber Reinforced ◽  
Polymer Laminates ◽  
Flange Angle

The cure process of carbon fiber-reinforced polymer laminates induces residual stress inside the parts that causes geometrical unconformities. The most important unconformity is the spring-in that means the deviation of the flange-to-flange angle from the design angle. The spring-in value depends on some process parameters, such as the lay-up sequence of the plies, as demonstrated in previous works. The aim of this work is to study the dependence of the spring-in on the deviations in the orientation of the plies due to a hand process. A numerical tool was developed and experimentally tested.

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