Flexural Behaviour of Damaged RC Beams Strengthened with Ultra High Performance Concrete

Prem, Prabhat Ranjan; Murthy, A. Ramachandra; Ramesh, Gomasa; Bharatkumar, B. H.; Iyer, Nagesh R.

doi:10.1007/978-81-322-2187-6_158

Cited by 41 publications

(22 citation statements)

References 10 publications

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“…Both the experimental and numerical results demonstrated that the fibre content not only prevents debonding from the concrete substrate but also increases the load bearing capacity of the strengthened RC beams. Prem et al [41] studied experimentally the performance of retrofitted or repaired predamaged RC beams with a layer of UHPFRC at the tension side. e results indicated that using UHPFRC, as repaired materials for the predamaged RC beams, would result in a significant increase in the failure load.…”

Section: Literature Review Of Existing Studiesmentioning

confidence: 99%

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Exploitation of Ultrahigh‐Performance Fibre‐Reinforced Concrete for the Strengthening of Concrete Structural Members

Al‐Osta

2018

Advances in Civil Engineering

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e repair and strengthening of reinforced concrete members are very important due to several factors, including unexpected increases in load levels and/or the damaging impact of aggressive environmental conditions on structural concrete members. Many researchers have turned to using materials for the repair and strengthening of damaged structures or the construction of new concrete structural members. Ultrahigh-performance fibre-reinforced concrete (UHPFRC), characterized by superior structural and durability performance in aggressive environmental conditions, is one of the materials that have been considered for the repair and strengthening of concrete structural members. e repair or strengthening of concrete structures using UHPFRC needs a thorough knowledge of the behaviour of both the strengthening material and the strengthened concrete structure at service load conditions, in addition to an understanding of the design guidelines governing the use of such materials for effective repair and strengthening. In this study, the recent issues and findings regarding the use of UHPFRC as a repair or strengthening material for concrete structural members are reviewed, analysed, and discussed. In addition, recommendations were made concerning areas where future attention and research on the use of UHPFRC as a strengthening material needs to be focused if the material is to be applied in practice.

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Section: Literature Review Of Existing Studiesmentioning

confidence: 99%

“…Beam specimens were cured using hot air curing, which shows the highest values in the failure load. Damaged RC beams strengthened with UHPFRC and cured using different curing methods were studied by Prem et al [41], as shown in Figure 8.…”

Section: Effect Of Curing Type On Capacity Enhancementmentioning

confidence: 99%

Exploitation of Ultrahigh‐Performance Fibre‐Reinforced Concrete for the Strengthening of Concrete Structural Members

Al‐Osta

2018

Advances in Civil Engineering

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“…Currently, many countries are exploring possibility of commercializing UHPC for application in concrete structures exposed to aggressive environment or heavy vehicular traffic and demand high service life. Several niche applications 31 such as railways sleepers, 32 wind concrete towers, 33 bridge decks, 34 strengthening of damaged members, 35‐37 and implementation as thin strips for flexural and shear strengthening of RC beams, beam–column joints , columns, and slabs 38‐40 . Although there have been several advancements in modeling structural responses of UHPC, theoretically, numerically, or empirically, 41‐43 there is wide research gap to relate the microstructural changes to structural responses.…”

Section: Introductionmentioning

confidence: 99%

Smart monitoring of strengthened beams made of ultrahigh performance concrete using integrated and nonintegrated acoustic emission approach

Prem

Verma

Murthy

et al. 2021

Struct Control Health Monit

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Summary Ultrahigh performance concrete (UHPC) is one of the recent advancements in construction building materials and popularly used as a precast applications or strengthening material. The current paper attempts to improve understanding about fracture and failure mechanisms of UHPC application as a strengthening material using acoustic emission (AE) technique. The paper proposes an integrated and nonintegrated approach to relate the mechanical energy with AE energy for (i) undamaged reinforced concrete (RC) beams and (ii) damaged RC beams strengthened with UHPC. The integrated approach evaluates the damage mechanisms by evaluating sentry function (logarithmic ratio of mechanical and acoustic energy), while nonintegrated approach considers superimposition of flexure and AE response, load versus AE energy behavior and damage index. To validate the proposed approach, experiments are conducted on (i) control RC beams and (ii) RC beams strengthened with UHPC layers of t, 1.5t, and 2t thickness (where t = 10 mm). From the study, it is found that analysis of structures using both the approaches can overcome corresponding limitations. Hence, to completely characterize the damage, both methods are recommended.

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“…In the last decade, studies have experimentally used UHPFRC for the flexural strengthening of RC beams [10][11][12][13][14]. ey showed that UHPFRC could increase stiffness and resistance and delay the formation of localised cracks.…”

Section: Introductionmentioning

confidence: 99%

Shear Behaviour of RC Beams Strengthened by Various Ultrahigh Performance Fibre‐Reinforced Concrete Systems

Mansour

Tayeh

2020

Advances in Civil Engineering

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This study presents a numerical investigation on the shear behaviour of shear-strengthened reinforced concrete (RC) beams by using various ultrahigh performance fibre-reinforced concrete (UHPFRC) systems. The proposed 3D finite element model (FEM) was verified by comparing its results with those of experimental studies in the literature. The validated numerical model is used to analyse the crucial parameters, which are mainly related to the design of RC beams and shear-strengthened UHPFRC layers, such as the effect of shear span-to-depth ratio on the shear behaviour of the strengthened or nonstrengthened RC beams and the effect of geometry and length of UHPFRC layers. Moreover, the effect of the UHPFRC layers’ reinforcement ratio and strengthening of one longitudinal vertical face on the mechanical performance of RC beams strengthened in shear with UHPFRC layers is investigated. Results of the analysed beams show that the shear span-to-depth ratio significantly affects the shear behaviour of not only the normal-strength RC beams but also the RC beams strengthened with UHPFRC layers. However, the effect of shear span-to-depth ratio has not been considered in existing design code equations. Consequently, this study suggests two formulas to estimate the shear strength of normal-strength RC beams and UHPFRC-strengthened RC beams considering the effect of the shear span-to-depth ratio.

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Flexural Behaviour of Damaged RC Beams Strengthened with Ultra High Performance Concrete

Cited by 41 publications

References 10 publications

Exploitation of Ultrahigh‐Performance Fibre‐Reinforced Concrete for the Strengthening of Concrete Structural Members

Exploitation of Ultrahigh‐Performance Fibre‐Reinforced Concrete for the Strengthening of Concrete Structural Members

Smart monitoring of strengthened beams made of ultrahigh performance concrete using integrated and nonintegrated acoustic emission approach

Shear Behaviour of RC Beams Strengthened by Various Ultrahigh Performance Fibre‐Reinforced Concrete Systems

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