scholarly journals Flexural behaviour of reinforced concrete members strengthened with prestressed CFRP laminate

2021 ◽  
Author(s):  
Justas Šlaitas
Keyword(s):  
Reinforced Concrete ◽  
Flexural Behaviour ◽  
Cfrp Laminate ◽  
Concrete Members

Flexural Behaviour of Reinforced Concrete Members Subjected to Freeze-Thaw Cycles

2011 ◽  
Vol 71-78 ◽  
pp. 712-716
Author(s):  
An Duan ◽  
Wei Liang Jin
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Flexural Behavior ◽  
Relative Depth ◽  
Flexural Behaviour ◽  
Reinforced Concrete Slab ◽  
Freeze Thaw ◽  
Concrete Members ◽  
Curvature Ductility ◽  
Strain Relationship

The purpose of this research is to investigate the influence of the freeze-thaw cycles on the flexural behavior of reinforced concrete members. The variation of the concrete stress-strain relationship due to frozen-thawed deterioration was considered. The temperature distribution was calculated based on the heat conduction theory, and the damaged region affected by freeze-thaw cycles was determined. By using Reponse-2000 program, the flexural behaviour of a reinforced concrete slab was analyzed and predicted. The analytical results show that with increase of number of freeze-thaw cycles, the yield moment, the ultimate moment and the curvature ductility decreased, while the relative depth of neutral axis and the midspan deflection increased.

Flexural Behaviour of RC Beams Strengthened with Prestressed CFRP Plates：Comparisons of Bonded and Unbonded Method

2011 ◽  
Vol 480-481 ◽  
pp. 283-287
Author(s):  
Lang Ni Deng ◽  
Peng Zhang ◽  
Hua Chen
Keyword(s):  
Reinforced Concrete ◽  
Ultimate Load ◽  
Reinforced Concrete Beams ◽  
Flexural Behaviour ◽  
Bending Tests ◽  
Flexural Performance ◽  
Concrete Members ◽  
Four Point Bending ◽  
Anchorage System ◽  
Externally Bonded

In this study, a total of 5 CFRP-strengthened reinforced concrete beams were tested in flexure based on the independent development prestressing anchorage system. The various variables included bonding or no bonding of the CFRP and the amount of prestressing. The experiments consisted of one control beam, two prestressed CFRP-unbonded beams, and two prestressed CFRP-bonded beams, all the beams were subjected to four-point bending tests. The ultimate load, deformation, and CFRP strain were examined. The aim of this investigation was to study the flexural performance of reinforced concrete members strengthened using CFRP plates, employing different CFRP bonding and prestressing methods. The failure mode of the prestressed CFRP-plated beams was not debonding, but concrete crushing or FRP rupture. For the reinforced concrete members strengthened with externally bonded prestressed CFRP plates, after the debonding of the CFRP plates that occurred in the bonded cases, the behaviour of the bonded CFRP-plated beams changed to that of the unbonded CFRP-plated beams due to the effect of the anchorage system. The ductility indices of the beams in an unbonded system were less than that of those in a bonded system.

scholarly journals Investigating Some Parameters Affecting Flexural Behaviour of Reinforced Concrete Beams Strengthened with CFRP Laminate

2018 ◽  
Vol 2 (5) ◽  
Author(s):  
Azad A. Mohammed
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Load Capacity ◽  
Reinforced Concrete Beams ◽  
Flexural Behaviour ◽  
Ultimate Load Capacity ◽  
Cfrp Laminate ◽  
Steel Rebar ◽  
Effective Depth ◽  
Strengthened Beam

In this paper, the influence of some important parameters affecting flexural behaviour of reinforced concrete beams strengthened with one layer of CFRP laminate has been studied. For this purpose, six reinforced concrete beams were cast and tested in the laboratory. Based on the obtained data, when CFRP laminate is applied to the tension face, too close to the steel rebar, the flexural strength of the strengthened beam is reduced. In general, the performance of the beam strengthened with one wide CFRP strip is better than that strengthened with two equivalent narrow strips. Ultimate load capacity of each strengthened beam was calculated based on the method given by the ACI 440.2R and compared with the test one. It is concluded that to avoid the steel rebar-CFRP laminate interaction effect, the CFRP laminate depth to the effective depth ratio (df / d) should not be smaller than about 1.17.

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