Shear Behavior of Reinforced Concrete T-Beams with Externally Bonded Fiber-Reinforced Polymer Sheets

2001 ◽  
Vol 98 (3) ◽  
Keyword(s):  
Reinforced Concrete ◽  
Shear Behavior ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Polymer Sheets ◽  
Externally Bonded

Reinforced Concrete T-Beams Strengthened in Shear with Fiber Reinforced Polymer Sheets

2003 ◽  
Vol 7 (4) ◽  
pp. 302-310 ◽  
Author(s):  
Christophe Deniaud ◽  
J. J. Roger Cheng
Keyword(s):  
Reinforced Concrete ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Polymer Sheets

Externally bonded carbon fiber–reinforced polymer composites for seismic retrofit of reinforced concrete coupling beams designed according to old codes

2018 ◽  
Vol 22 (6) ◽  
pp. 1412-1425 ◽  
Author(s):  
Sara Honarparast ◽  
Georges El-Saikaly ◽  
Omar Chaallal
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Polymer Composites ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Externally Bonded ◽  
Carbon Fiber Reinforced

A large number of existing buildings have seismic-resistant systems designed according to old code provisions. These structural systems exhibit non-ductile behavior and can present a significant risk in the case of a moderate or significant seismic event. Reinforced concrete–coupled shear walls designed to old codes and standards are among those deficient structures that need to be seismically upgraded. This article aims to investigate a new retrofitting and upgrading method using externally bonded carbon fiber–reinforced polymer composites for existing or/and damaged reinforced concrete coupling beams that can improve the seismic performance of them during earthquakes. To this end, an experimental test was conducted to evaluate the seismic behavior of two identical reinforced concrete–coupled shear wall specimens under reverse cyclic loading. To simulate the old existing building, the specimens were designed and constructed according to the old 1941 National Building Code of Canada with a conventionally reinforced coupling beam. One of the specimens was tested as a control, and the other was strengthened using externally bonded carbon fiber–reinforced polymer composites to evaluate the improvement in its seismic performance. Results show that the retrofit using externally bonded carbon fiber–reinforced polymer resulted in significant enhancement in strength and energy dissipation capacity compared to the conventionally reinforced coupling beam from the control specimen. In addition, externally bonded carbon fiber–reinforced polymer sheets resulted in much improved hysteretic and ductile behavior and in lesser strength and stiffness degradation.

scholarly journals Influence of Fiber-Reinforced Polymer Sheets on the Constitutive Relationships of Reinforced Concrete Elements

2016 ◽  
Vol 20 (2) ◽  
pp. 04015058
Author(s):  
Yashar Moslehy ◽  
Moheb Labib ◽  
Ashraf Ayoub ◽  
Ravi Mullapudi
Keyword(s):  
Reinforced Concrete ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Constitutive Relationships ◽  
Reinforced Polymer ◽  
Polymer Sheets ◽  
Concrete Elements

Experimental investigation of seismic strengthening of reinforced concrete short columns using externally bonded reinforcement, near surface mounted, and hybrid techniques

2019 ◽  
Vol 54 (9) ◽  
pp. 1177-1195 ◽  
Author(s):  
A Kargaran ◽  
A Kheyroddin
Keyword(s):  
Reinforced Concrete ◽  
Fiber Reinforced Polymer ◽  
Dissipated Energy ◽  
Fiber Reinforced ◽  
Near Surface ◽  
Short Columns ◽  
Reinforced Polymer ◽  
Shear Rupture ◽  
Externally Bonded ◽  
Near Surface Mounted

Nowadays, the existence of short columns is a major factor in the failure and collapse of structures during the earthquake. In this article, 10 reinforced concrete short columns are prepared and experimentally investigated under cyclic lateral displacements. Since failure in short columns under earthquake was in the form of diagonal cracks and shear rupture, two new techniques are proposed to strengthen short columns against seismic loads. These techniques include externally bonded reinforcement with carbon fiber-reinforced polymer sheets and near surface mounted with glass fiber-reinforced polymer bars in the form of transverse, diagonal, and hybrid strengthening techniques. The experimental results demonstrated that the above-mentioned strengthening techniques in short columns lead to a change in the type of failure from shear to flexural, and the change of crack patterns and columns failure. The mentioned strengthening methods lead to an increase of ductility, increase of load carrying capacity and increase of dissipated energy.

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