Bonded steel plating for strengthening concrete structures

Macdonald, Martin; Calder, Ajj

doi:10.1016/0143-7496(82)90125-7

Cited by 78 publications

(25 citation statements)

References 3 publications

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“…Macdonald and Calder [13], altering adhesive stiffness in an unspecified range, found that it has virtually no significant effect on the loaddeflection behaviour of the beam; although, it was seen that the use of a stiffer adhesive generated more flexural cracks at a closer spacing than either the as-cast beams or plated beams using a flexible adhesive could show. The reason behind this behaviour was not identified or explained.…”

Section: Initial Stiffness Of Adhesivementioning

confidence: 99%

“…11a. With the use of stiffer adhesive, the distribution of stresses are increasingly even, and that might be the reason for flexural cracks getting closely spaced in the experimental study of Macdonald and Calder [13]. Further investigation in Fig.…”

Section: Specimens Of Jones (Jones Et Al [6])mentioning

confidence: 99%

“…Even though some work has been found to indicate that the choice of softer adhesive increased the capacity of beam (MacDonald & Calder, 1982), relatively stiffer adhesives have been largely assumed to provide better strengthening. Largely, due to the fact that adhesive has been widely consid-ered as an insignificant structural component towards the capacity of a composite beam; material capabilities (if not structural) of adhesive have also been ignored for further research towards studying its effects on premature failures (particularly debonding).…”

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confidence: 99%

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Controlled failure warning and mitigation of prematurely failing beam through adhesive

Khan

Silberschmidt

El-Rimawi

2017

Composite Structures

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In plated beam, an adhesive is used primarily to adhere the external plate to the concrete beam to achieve a composite action. Even though some work has been found to indicate that the choice of softer adhesive increased the capacity of beam (MacDonald & Calder, 1982), relatively stiffer adhesives have been largely assumed to provide better strengthening. Largely, due to the fact that adhesive has been widely consid-ered as an insignificant structural component towards the capacity of a composite beam; material capabilities (if not structural) of adhesive have also been ignored for further research towards studying its effects on premature failures (particularly debonding). Under mixedmode loading, the adoption through discretisation of Cohesive Zone Model as a bulk material (indicative of adhesive component) and to simulate interfacial cracks is shown here to achieve the objectives. The outcomes of the research indicate the critical material properties of adhesive in all directions, such as stiffness, strength and crack energy, play crucial role in controlling the behaviour of modes of failure. Further, based on this study, recommenda-tions have been proposed on the choice of adhesive type at different locations of plated beam so as to capture a failure warning and avoid catastrophic failure.

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Section: Initial Stiffness Of Adhesivementioning

confidence: 99%

Section: Specimens Of Jones (Jones Et Al [6])mentioning

confidence: 99%

mentioning

confidence: 99%

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Controlled failure warning and mitigation of prematurely failing beam through adhesive

Khan

Silberschmidt

El-Rimawi

2017

Composite Structures

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“…MacDonald and Calder (1982) studied the behavior of concrete beams externally reinforced with steel plates bonded to their tension flanges. They tested a series of 3.5-m-long (11.5-ft) and 4.9-m-long (16-ft) beams in fourpoint bending.…”

Section: Previous Studiesmentioning

confidence: 99%

RC Beams Strengthened with GFRP Plates. I: Experimental Study

1991

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ABSTRACT:The static strength of reinforced concrete beams strengthened by gluing glass-fiber-reinforced-plastic (GFRP) plates to their tension flanges is experimentally investigated. Five rectangular beams and one T-beam were tested to failure under four-point bending. The measured load versus strain in GFRP plate, steel rebar, extreme compression fiber of concrete, and the load versus deflection for the section at midspan of the beams are plotted and compared to the predicted values. The results indicate that the flexural strength of RC beams can be significantly increased by gluing GFRP plates to the tension face. In addition, the epoxy bonded plates improved the cracking behavior of the beams by delaying the formation of visible cracks and reducing crack widths at higher load levels.

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“…Unlike [30], Oh [23,29] reported that the ultimate capacity of a strengthened beam increased slightly with the increase of the adhesive thickness. [29] noted that this may be caused by the late initiation of plate separation.…”

Section: Thickness Of Adhesive Layer T Gmentioning

confidence: 99%

Relative behaviour of premature failures in adhesively plated RC beam using controllable and existing parameters

Khan

El-Rimawi

Silberschmidt

2017

Composite Structures

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Retrofitting of RC beam by gluing a steel plate at the soffit has been a widely adopted technique due to its ease of use, calculations and having minimal variations on structural aesthetics; hence, a large number of such retrofitted structures exist today. However, such structures have also failed frequently due to the formation of premature failures such as peeling and debonding. The further investigations conducted in literature indicated that such undesirable failures can be effected by a large number of geometrical and material parameters. Although, the characterisation and relative influence of such parameters on modes of failures remain unknown; as the past studies have been largely case sensitive or focussing on a small set of parameters. Therefore, to address these issues, a simple but focussed numerical model has been validated through literature for multiple modes of failures over wide range of possible parameters. Further, targeting the response of beam and its critical locations, the authors of this study suggest that the understanding of relative impact of effective parameters, in terms of beam capacity and brittleness of modes of failure, can be broadly utilised to re-evaluate the cause(s) of failure(s) through case studies, or to predict the future of retrofitted structures/beams.

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Bonded steel plating for strengthening concrete structures

Cited by 78 publications

References 3 publications

Controlled failure warning and mitigation of prematurely failing beam through adhesive

Controlled failure warning and mitigation of prematurely failing beam through adhesive

RC Beams Strengthened with GFRP Plates. I: Experimental Study

Relative behaviour of premature failures in adhesively plated RC beam using controllable and existing parameters

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