scholarly journals An experimental approach to the influence of partial rebar corrosion and concrete degradation on behavior of FRP-strengthened RC beams

2021 ◽  
Vol 3 (9) ◽  
Author(s):  
M. Abbasi ◽  
H. Naderpour
Keyword(s):  
Bearing Capacity ◽  
Structural Damage ◽  
Shear Capacity ◽  
Reinforced Concrete Beams ◽  
Control Specimen ◽  
Reinforced Polymer ◽  
Concrete Damage ◽  
Concrete Degradation ◽  
Inaccurate Estimation ◽  
Force Displacement

AbstractHuman factors are one of the main reasons for structural damage as they decrease the bearing capacity and also lead to an inaccurate estimation of the structure. Previous studies show that the use of CFRP in the damaged structures can significantly increase their bending and shear capacity. This study examines the capacity and cracks distribution in eight RC (reinforced concrete) beams (210 × 250 × 250 cm), each of which was rehabilitated with seven CFRP (carbon fiber-reinforced polymer) strips using the strip method. Each beam, except for the control specimen, experiences different types of concrete and rebar damages, which are finally compared with those of the control specimen. The results indicated that rebar damage in all the beams was significant and the effects of concrete damage were minimized by CFRP strips. Moreover, the force–displacement diagrams indicate the greatest force for the control specimen. Other specimens reached up to 80% of the force experienced by the control specimen. Finally, the parametric study showed that the influence of the crack width on decreasing the bearing capacity was more significant compared with the other parameters.

A proposed strengthening model considering interaction of concrete-stirrup-FRP system for RC beams shear-strengthened with EB-FRP sheets

2018 ◽  
Vol 37 (10) ◽  
pp. 685-700 ◽  
Author(s):  
Weiwen Li ◽  
Chengyue Hu ◽  
Zejie Pan ◽  
Wei Peng ◽  
Yong Yang ◽  
...  
Keyword(s):  
Effective Strain ◽  
Polymer System ◽  
Design Guidelines ◽  
Shear Capacity ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Externally Bonded

Many factors can affect the shear capacity of fiber-reinforced polymer in reinforced concrete beams shear-strengthened with externally bonded fiber-reinforced polymer composites. Undoubtedly, the interaction of concrete-stirrup-fiber-reinforced polymer system is one of the key factors. However, most of the existing fiber-reinforced polymer design guidelines do not take account of this important factor on predicting fiber-reinforced polymer shear capacity. This study provides an advanced strengthening model that comprehensively considers the interaction among concrete, stirrup, and fiber-reinforced polymer for calculating the fiber-reinforced polymer effective strain. The advanced strengthening model provides a more accurate prediction for the fiber-reinforced polymer shear contribution compared with existing design guidelines.

scholarly journals Shear capacity of reinforced concrete beams strengthened with web side bonded CFRP sheets

2019 ◽  
Vol 258 ◽  
pp. 04010
Author(s):  
Rendy Thamrin ◽  
Zaidir ◽  
Sabril Haris
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Concrete Cover ◽  
Shear Capacity ◽  
Reinforcement Ratio ◽  
Reinforced Concrete Beams ◽  
Longitudinal Reinforcement ◽  
Flexural Mode ◽  
Cfrp Sheets ◽  
Reinforced Polymer

The shear capacity of reinforced concrete beams strengthened with web side bonded carbon fiber-reinforced polymer (CFRP) sheets was measured experimentally. Nine reinforced concrete beams without stirrups; three control beams and six beams strengthened with minimal application of web side bonded CFRP sheets, were tested. The test variables were ratio of longitudinal reinforcement (1%, 1.4%, and 2.4%) and angle of application of CFRP sheets (450 and 900). The test results show that reinforced concrete beams strengthened with web side bonded CFRP sheets have higher shear capacity compared to the control beams. Shear capacity of strengthened beams with 450 angle of application of CFRP sheets is similar to that of beams strengthened with 900 angles. Beams with 1% of longitudinal reinforcement ratio failed in flexural mode indicated by concrete crushing in compression zone while beams with higher longitudinal reinforcement ratio (1.4% and 2.4%) failed in brittle mode as indicated by delamination of the concrete cover.

Research on the Flexural Behaviour of Reinforced Concrete Beams Strengthened with CFRP

2011 ◽  
Vol 194-196 ◽  
pp. 1781-1784
Author(s):  
Hua Wei ◽  
Ji Ye Zhang ◽  
Da Wei Zhu ◽  
Zhi Yuan Peng ◽  
Hai Jun Wang
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Ultimate Load ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Experimental Result ◽  
Reinforced Polymer ◽  
Flexural Member ◽  
Good Agreement

In order to clear the influence of carbon fiber reinforced polymer (CFRP) on the bearing capacity of reinforced concrete beams, tests of three reinforced concrete beams strengthened with CFRP are carried out. Experimental result shows that CFRP can effectively increase bearing capacity of flexural member, and can restrain the development of crack. Cracking load, yield load and ultimate load are significantly increased. At the same time numerical simulation is done; it is good agreement with experimental results.

Experimental Investigation on Shear Behavior Of GFRP-Concrete Hybrid Beams

2010 ◽  
Vol 163-167 ◽  
pp. 3433-3439
Author(s):  
Fei Zhao ◽  
Peng Feng ◽  
Chao He Chen ◽  
Wen Juan Lou
Keyword(s):  
Experimental Investigation ◽  
Shear Behavior ◽  
Shear Capacity ◽  
Reinforced Concrete Beams ◽  
Test Results ◽  
Hybrid Beam ◽  
Permanent Formwork ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Hybrid Beams

The present study describes an experimental investigation on shear behavior of GFRP-concrete hybrid beams, consisting of reinforced concrete beams combined with U-shaped glass fiber reinforced polymer pultruded profile constructed as combined tensile reinforcement, permanent formwork and corrosion resistance. A total of six beams were tested, three served as control beams and the remaining were implemented with U-shaped GFRP composites. Test results show that hybrid beam provides significant increase in shear capacity when compared to control RC beam.

scholarly journals Flexural Reinforced Concrete Elements, Strengthened with Fibre Reinforced Polymer, Bearing Capacity Evaluation According to Limit Crack Depth

2017 ◽  
Vol 9 (5) ◽  
pp. 507-519
Author(s):  
Justas Šlaitas
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Crack Depth ◽  
Experimental Studies ◽  
Reinforced Concrete Beams ◽  
Reinforced Polymer ◽  
Capacity Evaluation ◽  
Carbon Fibre Reinforced Polymer ◽  
Calculation Results ◽  
Fibre Reinforced Polymer

The research was made on condition assessment of flexed reinforced concrete structures, strengthened with fibre reinforced polymers, in fracture stage. Universal bearing capacity calculation method based on limit normal section crack depth was proposed. This paper confirms the hypothesis of triangular concrete’s compressive zone chart usage for flexural strength calculation, without tensile concrete above crack evaluation. There is established connection between crack depth and FRP stress­strain, which allows to decide about structures bearing capacity reserve. The calculation results are confirmed with experimental studies of 73 reinforced concrete beams, strengthened with carbon fibre reinforced polymer (CFRP) and glass fibre reinforced polymer (GFRP) sheets, plates, strips and rods, taken from different researches. Furthermore, recommended limits of strengthening with FRP were proposed.

Performance of Concrete Beams Strengthened with Prestressed CFRP Plates

2011 ◽  
Vol 480-481 ◽  
pp. 170-174 ◽  
Author(s):  
Hua Chen ◽  
Lang Ni Deng ◽  
Peng Zhang
Keyword(s):  
Carbon Fiber ◽  
Static Loading ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Control Specimen ◽  
Control Beam ◽  
Reinforced Polymer ◽  
Prestressed Beams

Six reinforced concrete beams were constructed and tested to investigate the effectiveness of strengthening with prestressed carbon fiber reinforced polymer (CFRP) plates. One of the beams served as a control specimen, another was strengthened with nonprestressed CFRP plates, and the remaining four were strengthened with prestressed CFRP plates. A set of self-developed anchorage devices for CFRP plates were introduced in this program. Monotone static loading experiments was carried out, and comparisons are made between the control beam, the nonprestressed beam and the prestressed beams. The serviceability and the ultimate performance of the concrete beams were improved by strengthened with prestressed CFRP plates.

Simulation Behavior of Flexure in Reinforced Concrete Beams Strengthened with Carbon Fiber Reinforced Polymer (CFRP)

2015 ◽  
Vol 754-755 ◽  
pp. 432-436
Author(s):  
Ibrahim H. Alfahdawi ◽  
S.A. Osman
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Shear Capacity ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Rc Beams ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

When reinforced concrete (RC) beams are found deficient in flexure, and fails in shear capacity after shear strengthening, the need to use new technique for flexure strengthening become important. Over the years, there are many experimental studies had been carried out with this technique of strengthening, and finding from other researchers have proved to be effective and successful. In this study, the behavior of flexure in RC beams strengthened with carbon fiber reinforced polymer (CFRP) were investigated. ANSYS11 software package of finite element method was use to simulate two models of RC beams with different parametric study such as (i) effect of grade of concrete, (ii) number of layers of CFRP strips, (iii) effect of steel stirrups and CFRP strips and (iv) longitudinal reinforcement yield stress. The results show that for beams strengthened with CFRP has increased in capacity load up to 32.8%. In general, good agreement between the FE solution and the available experimental results has been obtained.

Flexural Behavior of CFRP Strengthened Reinforced Concrete Beams

2013 ◽  
Vol 477-478 ◽  
pp. 740-743
Author(s):  
Hui Zhang ◽  
Hong Sheng Wu ◽  
Xing Quan Li
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Flexural Behavior ◽  
Experimental Result ◽  
Reinforced Polymer ◽  
Flexural Member ◽  
Good Agreement

In order to clear the influence of carbon fiber reinforced polymer (CFRP) on the bearing capacity of reinforced concrete beams, tests of three reinforced concrete beams strengthened with CFRP are carried out. Experimental result shows that CFRP can effectively increase bearing capacity of flexural member, and can restrain the development of crack. Cracking load, yield load and ultimate load are significantly increased. At the same time numerical simulation is done; it is good agreement with experimental results.

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