Theoretical and experimental study on externally plated R.C. beams

Raoof, Mohammed; El-Rimawi, Jamal; Hassanen, M.A.H.

doi:10.1016/s0141-0296(98)00056-x

Cited by 52 publications

(21 citation statements)

References 9 publications

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“…shear force W N i ði ¼ 1; 2Þ the transverse displacement in adherend ''i'' induced by the longitudinal forces b 2 the width of the soffit plate q the uniformly distributed load t i (i = 1, 2) the thickness of adherend ''i'' t a the thickness of adhesive u 1 the longitudinal displacement at the base of adherend 1 u 2 the longitudinal displacement at the top of adherend 2 u N 1 the longitudinal displacement induced by the longitudinal forces at the interface between the upper adherend and the adhesive u N 2 the longitudinal displacement induced by the longitudinal forces at the interface between the lower adherend and the adhesive w i (i = 1, 2) vertical displacements of adherend ''i'' y i (i = 1, 2) distances from the bottom of adherend 1 and the top of adherend 2 to their respective centroid e 1 strain at the base of adherend 1 e 2 strain at the top of adherend 2 e M i ði ¼ 1; 2Þ strains induced by the bending moment at the adherend ''i'' e N i ði ¼ 1; 2Þ strains induced by the longitudinal forces at the adherend ''i'' r xy(i) (i = 1, 2) the shear stresses in adherend ''i'' r n the normal stress in the adhesive c i (i = 1, 2) the shear strain in adherend ''i'' s a the shear stresses through the thickness of adhesive r N i ði ¼ 1; 2Þ longitudinal normal stresses for adherend ''i'' been made by Oehlers (1992), Baluch et al (1995) and Raoof et al (2000) for RC beams bonded with steel plates and Smith and Teng (2002a,b), Saadatmanesh and Malek (1998), Yuan et al (2004) and Gao et al (2005) for RC beams bonded with FRP plates. Accurate predictions of interfacial stresses are thus important for designing against debonding failures.…”

Section: Introductionmentioning

confidence: 99%

Improved theoretical solution for interfacial stresses in concrete beams strengthened with FRP plate

Tounsi

2006

International Journal of Solids and Structures

112

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In this paper, an improved theoretical interfacial stress analysis is presented for simply supported concrete beam bonded with a FRP plate. The adherend shear deformations have been included in the present theoretical analyses by assuming a linear shear stress through the thickness of the adherends, while all existing solutions neglect this effect. Remarkable effect of shear deformations of adherends has been noted in the results. Indeed, the resulting interfacial stresses concentrations are considerably smaller than those obtained by other models which neglect adherent shear deformations. It is shown that both the normal and shear stresses at the interface are influenced by the material and geometry parameters of the composite beam. This research is helpful for the understanding on mechanical behavior of the interface and design of the FRP-RC hybrid structures.

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Section: Introductionmentioning

confidence: 99%

Improved theoretical solution for interfacial stresses in concrete beams strengthened with FRP plate

Tounsi

2006

International Journal of Solids and Structures

112

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“…Whereas, the theoretical model of [16] indicated a substantial increase in peeling capacity with increase in b p =t p ratio. In contradiction to Macdonald [30], b p =t p ratio did not affect the mode of failure.…”

Section: Plate Width To Thickness Ratio B P =T Pmentioning

confidence: 84%

“…In addition, there are parameters that have little or no influence on premature failures; for example, variation of compressive strength of concrete [16][17][18].…”

Section: Secondary or Existing Parametersmentioning

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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“…The contribution of the bolt anchorage to the beam ductility was found to increase with increasing plate thickness. Raoof et al (2000) were able to establish that the premature plate peeling failure can be prevented by increasing the concrete strength, the ratio of the beam width to the plate width, the diameters of the internal tension rebars, and the number of layers of tension reinforcement. The experiments conducted by Sallam et al (2004) indicated that the ductility of a plated RC beam can be improved by replacing the cover concrete in the plate curtailment regions with a grout of higher strength or applying initial compressive stresses to the plate by pressing it against the beam with the help of clamps or bolts.…”

Section: Introductionmentioning

confidence: 99%

Strengthening of RC T-beams with perforated steel plates

Aykaç

Kalkan

et al. 2013

Magazine of Concrete Research

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The study investigates the flexural behaviour and ductilities of reinforced concrete (RC) T-beams strengthened with perforated steel plates. A total of eight full-scale RC T-beams were tested. Three strengthened beams and a reference unplated beam were reinforced with closely spaced stirrups, while the remaining plated beams and reference beam did not have adequate amounts of shear reinforcement (shear deficient). Shear strengthening with post-tensioned anchors was found to shift the failure mode of a shear-deficient beam from shear to flexure. The post-tensioning forces in the anchors were established to be kept at an optimum level to provide adequate shear strength to the beam and to prevent overstraining of the soffit plate between the shear anchor locations. The perforations increased the ductilities, energy absorption capacities and permanent deformations of the specimens. The use of compression plate in addition to the tension (soffit) plate greatly contributed to the ductilities of specimens with adequate and inadequate shear strength.

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Theoretical and experimental study on externally plated R.C. beams

Cited by 52 publications

References 9 publications

Improved theoretical solution for interfacial stresses in concrete beams strengthened with FRP plate

Improved theoretical solution for interfacial stresses in concrete beams strengthened with FRP plate

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

Strengthening of RC T-beams with perforated steel plates

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