Behaviour of corroded shear-critical reinforced concrete beams repaired with NSM CFRP rods

Almassri, Belal; Kreit, Amjad; Mahmoud, Firas Al; François, Raoul

doi:10.1016/j.compstruct.2014.12.043

Cited by 21 publications

(14 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In case of a reinforced concrete (RC) structures, the main detrimental factors are the increase in applied loads, corrosion of steel reinforcing bars and unexpected events such as earthquakes. The retrofit of RC elements can be achieved by adding steel or Fiber Reinforced Polymer (FRP) materials including rods [16], [17], plates [18] and innovative systems [19] to the damaged RC element. In the case of retrofitting plates, steel or FRP plates are attached to the surface of the concrete element in such a way that the slip between the connected materials is prevented and they act compositely in carrying the load.…”

Section: Introductionmentioning

confidence: 99%

Performance of composite connections strengthened with CFRP laminate

Ramezani¹

2020

Preprint

View full text Add to dashboard Cite

A three-dimensional non-linear finite element model is developed to predict the moment-rotational response of partial depth endplate composite connections strengthened with external Carbon Fiber Reinforced Polymer (CFRP) laminates. A parametric study is then performed to evaluate the influence of length, width and thickness of CFRP laminates on the composite connection performance. In addition, the feasibility of decreasing the reinforcement bar ratios in the presence of the CFRP laminate is investigated. The numerical analysis reveals that the flexural resistance of the retrofitted CFRP strengthened composite connection increases by up to around 20% and the rotation capacity decreases by approximately 60%. Also, the results indicate that applying CFRP laminate to the tension face of the composite slab can reduce the amount of rebar needed for the bending capacity of steel-concrete composite beam-to-column connections.

show abstract

Section: Introductionmentioning

confidence: 99%

Performance of composite connections strengthened with CFRP laminate

Ramezani¹

2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Ultimately, structural elements lose its flexural and shear capacity as well as their resistance to various types of external attacks. Hence, repair procedure would be urgently needed to preserve structural integrity and prevent possible catastrophic failures (Sun at al., 2015;Yu et al 2015;Song and Yu, 2015;Almassri et al, 2015;Azam and Soudki, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…This is preceded by the removal of the cracked concrete cover; especially in repair cases associated with reinforcing steel corrosion. Available field statistics show that high percentage of replaced concrete covers in flexural elements undergoes cracking shortly after casting or whenever the rehabilitation utilized initially was ineffective in slowing down or preventing concrete deterioration (Sun at al., 2015;Song and Yu, 2015;Almassri et al, 2015;Azam and Soudki, 2013). Fire and durability attacks on repaired flexural elements along with drying shrinkage can cause further cracking of existing or newly replaced concrete surfaces Haddad et al, 2013;Haddad and Al-Rousan, 2016;Siad et al, 2017;Aiello et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

“…Various literature works show noticeable enhancement in the mechanical performance of the cracked reinforced concrete flexural elements upon repair using externally-bonded carbon fiber reinforced polymer (CFRP) sheets (Song and Yu, 2015;Almassri et al, 2015;Azam and Soudki, 2013). However, presence of cracking may lead to premature debonding of externally attached composites which undermines repair efficiency with CFRP (Khorramabadi and Burgoyne, 2011).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Anchorage System for Enhanced Bond Behavior between Carbon Fiber Reinforced Polymer Sheets and Cracked Concrete

Haddad

2019

Lat. Am. j. solids struct.

View full text Add to dashboard Cite

The contribution of CFRP wraps, as an anchorage system, to enhancing bond behavior between CFRP sheet and cracked concrete, was investigated. Thirty six concrete blocks (150 x 150 x 200 mm) were cast with 3ϕ12 mm steel bars embedded laterally at different spacing along the 200-mm-dimension. Half of the moist-cured blocks were subjected to a cyclic treatment in 3% chloride solution until reinforced sides cracked at an average global crack size 0.54 mm; the remaining ones were immersed in a lime solution for a similar period, as controls. Finally, the blocks were attached at their reinforced surface to CFRP sheets at different bond widths and lengths with CFRP wrap anchorages applied over portions where high shearing stresses persist during pull-off testing. The results indicate that the physical status of concrete, the geometry of main CFRP sheets, and the extension of CFRP wrap anchorage are major factors that shape the benefit from the proposed anchorage technique. Empirical models, developed to predict bond strength and slippage at ultimate stress, show very good predictability of literature data.

show abstract

“…Experimental modes of failure for all tested beams It is also noteworthy that for shear-repaired beams A1T-SB and A1CL3-SB, many splitting cracks occurred at the mid-way of the beam's width as shown in figure 7 , these splitting cracks were clear to notice at the bottom of the beam and at the beams edges near the supports. More details of the experimental program of the short beams and experimental results can be found elsewhere(21).…”

mentioning

confidence: 99%

A FEM-based model to study the behaviour of corroded RC beams shear-repaired by NSM CFRP rods technique

Almassri

Barros

Mahmoud

et al. 2015

Composite Structures

Self Cite

View full text Add to dashboard Cite

This paper presents the main features of finite element FE numerical model developed using the computer code FEMIX to predict the near-surface mounted NSM carbon-fiber-reinforced polymer CFRP rods shear repair contribution to corroded reinforced concrete RC beams. In the RC beams shear repaired with NSM technique, the Carbon Fibre Reinforced Polymer (CFRP) rods are placed inside pre-cut grooves onto the concrete cover of the RC beam's lateral faces and are bonded to the concrete with high epoxy adhesive. Experimental and 3D numerical modelling results are presented in this paper in terms of load-deflection curves, and failure modes for 4 short corroded beams: two corroded beams (A1CL3-B and A1CL3-SB) and two control beams (A1T-B and A1T-SB), the beams noted with B were let repaired in bending only with NSM CFRP rods while the ones noted with SB were repaired in both bending and shear with NSM technique. The corrosion of the tensile steel bars and its effect on the shear capacity of the RC beams was discussed. Results showed that the FE model was able to capture the main aspects of the experimental load-deflection curves of the RC beams, moreover it has presented the experimental failure modes and FE numerical modelling crack patterns and both gave similar results for non-shear repaired beams which failed in diagonal tension mode of failure and for shear-repaired beams which failed due to large flexural crack at the middle of the beams along with the concrete crushing, three dimensional crack patterns were produced for shear-repaired beams in order to investigate the splitting cracks occurred at the middle of the beams and near the support.

show abstract

Behaviour of corroded shear-critical reinforced concrete beams repaired with NSM CFRP rods

Cited by 21 publications

References 26 publications

Performance of composite connections strengthened with CFRP laminate

Performance of composite connections strengthened with CFRP laminate

An Anchorage System for Enhanced Bond Behavior between Carbon Fiber Reinforced Polymer Sheets and Cracked Concrete

A FEM-based model to study the behaviour of corroded RC beams shear-repaired by NSM CFRP rods technique

Contact Info

Product

Resources

About