Assessment of Carbon Fiber Reinforced Polymer Repair for Laterally Damaged Prestressed Concrete Girders

2013 ◽  
Vol 2 (1) ◽  
pp. 20130083
Author(s):  
A. ElSafty ◽  
M. K. Graeff ◽  
S. Fallaha
Keyword(s):  
Carbon Fiber ◽  
Prestressed Concrete ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Concrete Girders ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced ◽  
Prestressed Concrete Girders

scholarly journals Experimental investigation on the seismic behavior of concrete beams with prestressing carbon fiber reinforced polymer tendons

2019 ◽  
Vol 103 (1) ◽  
pp. 003685041988523
Author(s):  
Zuohu Wang ◽  
Zhanguang Gao ◽  
Yuan Yao ◽  
Weizhang Liao
Keyword(s):  
Carbon Fiber ◽  
Prestressed Concrete ◽  
Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Ductility Index ◽  
Reinforced Polymer ◽  
Energy Dissipation Capacity ◽  
Carbon Fiber Reinforced

Seven prestressed concrete beams and one normal concrete beam were tested to study the seismic performance of concrete beams with prestressing carbon fiber reinforced polymer tendons. The failure modes, hysteretic curves, ductility, stiffness degeneration, and energy dissipation capacity were studied systematically. This study shows that the partial prestressing ratio is the main factor that affects the seismic performance of carbon fiber reinforced polymer prestressed concrete beams. The beam is more resilient to seismic loads as the partial prestressing ratio decreases. Under the same partial prestressing ratio value, the energy dissipation capacity of prestressed concrete beams with unbonded carbon fiber reinforced polymer tendons was better than that of prestressed beams with bonded carbon fiber reinforced polymer tendons. When combining both bonded and unbonded prestressing carbon fiber reinforced polymer tendons, the ductility index of concrete beams was improved. Compared with that of fully unbonded and fully bonded carbon fiber reinforced polymer prestressed concrete beams, the ductility index of concrete beams with combined bonded and unbonded prestressing tendons increased by 26% and 12%, respectively.

scholarly journals Thermography-Based Deterioration Detection in Concrete Bridge Girders Strengthened with Carbon Fiber-Reinforced Polymer

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3263 ◽  
Author(s):  
Van Ha Mac ◽  
Jungwon Huh ◽  
Nhu Son Doan ◽  
Geunock Shin ◽  
Bang Yeon Lee
Keyword(s):  
Carbon Fiber ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Concrete Core ◽  
Concrete Girders ◽  
Reinforced Polymer ◽  
Cfrp Sheet ◽  
Step Heating ◽  
Carbon Fiber Reinforced

In bridge structures worldwide, carbon fiber-reinforced polymer (CFRP) sheets are applied to strengthen weak components, especially concrete girders that are at a high risk of rapid degradation during the bridge’s operation owing to impacts from the superstructure’s weight and traffic loads. Regarding the thermography-based method (TM), although deteriorations in the concrete core are some of the main defects in concrete structures strengthened with CFRP, these do not receive as much attention as damage in the CFRP. Therefore, the interpretation of the structural health in terms of these defects using TM is still unclear. The problem presented in this work addresses the quantification of delamination inside the concrete part of a specimen with a CFRP sheet installed on the surface (assumed to be the girder surface strengthened with CFRP) via step heating thermography. Additionally, the empirical thermal diffusivity of concrete girders strengthened with a CFRP sheet (CSC girder), has not been provided previously, is proposed in the present study to predict delamination depths used for field investigations. Moreover, the effect of the CFRP sheet installed on the structure’s surface on the absolute contrast of delamination is clarified. Finally, advanced post-processing algorithms, i.e., thermal signal reconstruction and pulsed phase thermography, are applied to images obtained with step heating thermography to enhance the visibility of delamination in CSC girders.

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