Behavioral Trends of RC Beams Strengthened with Externally Bonded FRP

Bonacci, John F.; Maalej, Mohamed

doi:10.1061/(asce)1090-0268(2001)5:2(102)

Cited by 134 publications

(46 citation statements)

References 13 publications

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“…In addition to the normal failure modes of RC beams in flexure (crushing of concrete in compression, yielding of tensile steel, buckling of compression steel, shear), FRP-strengthened RC beams may fail by rupture or debonding of the FRP plates. From previous experimental observations, the majority of failures occur as a result of debonding (Bonacci and Maalej, 2001). Many techniques have been developed to prevent premature debonding of FRP plates, but the most common method is to wrap them and the RC member with FRP sheets, as was done in this research.…”

Section: Model For Load-bearing Capacity Of Corroded and Repaired Rc mentioning

confidence: 99%

Load-bearing capacity of corroded, patched and FRP-repaired RC beams

Malumbela

Moyo

Alexander

2011

Magazine of Concrete Research

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This paper presents the results of an experimental study conducted to investigate the performance of corroded, patched and fibre reinforced polymer (FRP) repaired reinforced concrete (RC) beams. The overall programme tested 20 quasi-full-scale (153325433000 mm) RC beams of which 17 were corroded under various levels of sustained loads.After corrosion, eight beams were patch-repaired whilst four were FRP-repaired. Two of the patch-repaired beams were later further repaired with FRPs. The test results showed that 1% mass loss of steel reduced the load-bearing capacity of RC beams by 0 . 8%. Patch repairs were found to slightly increase (by 2 . 5%) the load-bearing capacity of corroded beams, but to significantly increase their stiffness. The load-bearing capacity of FRP-repaired beams was about 50% larger than the capacity of an uncorroded beam and was insensitive to levels of steel corrosion and to patch repairs. There was, however, a significant increase in stiffness of the patch-and then the FRP-repaired beams.It is, therefore, recommended that repair of corroded RC structures should entail patching followed by FRP repairs.

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Section: Model For Load-bearing Capacity Of Corroded and Repaired Rc mentioning

confidence: 99%

Load-bearing capacity of corroded, patched and FRP-repaired RC beams

Malumbela

Moyo

Alexander

2011

Magazine of Concrete Research

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“…A strengthened or damaged structure can retrofi tted to a satisfactory level of performance at a reasonable cost by different methods. Repairing or strengthening concrete beams by applying repairing technique on the tension face of the beam (such as using reinforced concrete layer [3,4], Ferrocement layer [5,6], steel plates [2] and FRP wrap laminates [7][8][9][10]) considered as one of the common used repairing or strengthening techniques for beams. The main objective of using beneath layer is to increase the load capacity of concrete beam.…”

Section: Introductionmentioning

confidence: 99%

Flexural Strengthening of Reinforced Concrete Beams Using Valid Strengthening Techniques

Bashandy

2013

Archives of Civil Engineering

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This study aims to evaluate the efficiency of strengthening reinforced concrete beams using some valid strengthening materials and techniques. Using concrete layer, reinforced concrete layer and steel plates are investigated in this research. Experiments on strengthening beam samples of dimensions 100x150x1100mm are performed. Samples are divided in to three groups. Group “A” is strengthened using 2cm thickness concrete layer only (two types). Group “B” is strengthened using 2cm thickness concrete layer reinforced with meshes (steel and plastic). Group “C” is strengthened using steel plates. The initial cracking load, ultimate load and crack pattern of tested beams are illustrated. The experimental results show that for group A and B, the ultimate strength, stiffness, ductility, and failure mode of RC beams, with the same thickness strengthening layer applied, will be affected by the mesh type, type of concrete layer. While for group C, these parameters affected by the fixation technique and adhesion type.

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“…Currently, a wide variety of methods has been proposed for a seismic retrofit [1][2][3][4]. The study on the one of these seismic retrofit methods repairing and retrofitting damaged major members such as concrete slabs and girders by using composite materials such as fiber reinforced polymer (FRP) and steel plate has been extensively done [5][6][7][8]. For reinforcement concrete (RC) piers in particular, the simple and effective method retrofitting the RC piers by covering with the steel plate or FRP externally has been suggested.…”

Section: Introductionmentioning

confidence: 99%

Improvement of the seismic retrofit performance of damaged reinforcement concrete piers using a fiber steel composite plate

Han¹,

Song²,

Han³

et al. 2013

Safety and Security Engineering V

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An experimental study was conducted to verify the application and efficiency of the jacket retrofit method to ensure seismic performance of damaged reinforcement concrete (RC) bridge piers. A total of 4 RC bridge piers were made and then 3 piers were pre-loaded under the range of service load to be damaged. These piers were retrofitted and repaired using a carbon fiber reinforced polymer (CFRP), steel plate, and fiber steel composite (FSC) plates. These retrofitted and repaired piers were subjected to repeated monotonic loading. Hysteresis and ultimate behaviours of the 3 RC piers were evaluated and compared with those of 1 non-damaged pier (standard specimen). As a test result, the retrofitted and repaired RC bridge piers applied by the jacket retrofit method were ensured under the targeted displacement ductility and ultimate load. The ultimate load and displacement ductility of the pier retrofitted and repaired by FSC plate were higher than those of other piers by CFRP and steel plates and also the pier by FSC plate showed better energy dissipation capacity than others. Generally, RC bridge pier retrofitted and repaired with the jacket retrofit method has low ductility but it was found that the pier retrofitted and repaired by FSC plate combined with CFRP and steel wire had overcome effectively this disadvantage through ductility evaluation based on the concept of energy numerically. This experiment showed that one could improve the safety margin and targeted ductility by repairing the cracks, spalls, etc. of the damaged RC Safety and Security Engineering V 853 bridge piers appropriately and then retrofitting them with the high ductile materials.

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Behavioral Trends of RC Beams Strengthened with Externally Bonded FRP

Cited by 134 publications

References 13 publications

Load-bearing capacity of corroded, patched and FRP-repaired RC beams

Load-bearing capacity of corroded, patched and FRP-repaired RC beams

Flexural Strengthening of Reinforced Concrete Beams Using Valid Strengthening Techniques

Improvement of the seismic retrofit performance of damaged reinforcement concrete piers using a fiber steel composite plate

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