Design limits for RC slabs strengthened with hybrid FRP–HPC retrofit system

Kim, Jung J.; Noh, Hyuk-Chun; Taha, Mahmoud Reda; Mosallam, Ayman

doi:10.1016/j.compositesb.2012.12.012

Cited by 14 publications

(16 citation statements)

References 5 publications

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“…This sudden failure was initiated from CFRP debonding from the concrete slab. To ensure ductile failure of flexural members [11], flexural failure design limits of a continuous RC slab according to its moment carrying and shear carrying capacities were proposed to develop a design method of the proposed hybrid FRP-HPC retrofitting system [12].…”

Section: Proposed Retrofit Systemmentioning

confidence: 99%

Flexural Strengthening of RC Slabs Using a Hybrid FRP-UHPC System Including Shear Connector

Moon

Taha

Kim

2017

Advances in Materials Science and Engineering

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A polymeric hybrid composite system made of UHPC and CFRP was proposed as a retrofit system to enhance flexural strength and ductility of RC slabs. While the effectiveness of the proposed system was confirmed previously through testing three full-scale one-way slabs having two continuous spans, the slabs retrofitted with the hybrid system failed in shear. This sudden shear failure would stem from the excessive enhancement of the flexural strength over the shear strength. In this study, shear connectors were installed between the hybrid system and a RC slab. Using simple beam, only positive moment section was examined. Two full-scale RC slabs were cast and tested to failure: the first as a control and the second using this new strengthening technique. The proposed strengthening system increased the ultimate load carrying capacity of the slab by 70%, the stiffness by 60%, and toughness by 128%. The efficiency of shear connectors on ductile behavior of the retrofitted slab was also confirmed. After the UHPC top is separated from the slab, the shear connector transfer shear load and the slab system were in force equilibrium by compression in UHPC and tension in CFRP.

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Section: Proposed Retrofit Systemmentioning

confidence: 99%

Flexural Strengthening of RC Slabs Using a Hybrid FRP-UHPC System Including Shear Connector

Moon

Taha

Kim

2017

Advances in Materials Science and Engineering

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“…By integrating these two materials, the ability of the proposed system to increase the moment carrying capacity of RCs labs or bridge decks is demonstrated [19,20]. The proposed system can be installed on the top of the RC slabs or deck to enhance the positive moment capacity (Figures11 & 12).…”

Section: Flexural Upgrade Of Reinforced Concrete Slabs With a Hybrid mentioning

confidence: 99%

Polymer Composites in Construction: An Overview

Mosallam¹,

Bayraktar²,

Elmikawi³

et al. 2014

SOJMSE

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“…, reinforced concrete (e.g. Mosallam, 2000, Haroun et al, 2003, Mosallam et al, 2012, Kim et al, 2013, Mosallam et al 2015, masonry (e.g. Mosallam, 2007 b , Mosallam and Banerjee, 2011), and wood (e.g.…”

Section: Introductionmentioning

confidence: 99%

Structural performance of RC shear walls with post-construction openings strengthened with FRP composite laminates

Mosallam

Nasr²

2017

Composites Part B: Engineering

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Over the past few decades, retrofitting of existing buildings, rather than new construction, became more popular due to economic reasons and the benefit of shorter service interruptions of constructed facilities. Change of use of an existing building may require the removal of portions of the structural members such as introducing door and window openings in an existing shear walls. In these scenarios, a remedial retrofit of such structural members is needed to restore the structural integrity and to regain building's seismic ductility. This paper presents the results of an experimental study that aimed at evaluating the structural performance of reinforced concrete (RC) shear walls, with different opening geometries strengthened with fiber-reinforced-polymer (FRP) carbon/epoxy composites laminates. Results of this study indicated that the proposed FRP strengthening system for strengthening RC shear walls with openings was successful in significantly enhancing both the strength and ductility of the retrofitted walls. The average strength gain and ductility enhancement of the retrofitted walls, as compared to the "as-built" walls ranged from 20 % to 28%. Conclusions and recommendations for future research is presented.

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Design limits for RC slabs strengthened with hybrid FRP–HPC retrofit system

Cited by 14 publications

References 5 publications

Flexural Strengthening of RC Slabs Using a Hybrid FRP-UHPC System Including Shear Connector

Flexural Strengthening of RC Slabs Using a Hybrid FRP-UHPC System Including Shear Connector

Polymer Composites in Construction: An Overview

Structural performance of RC shear walls with post-construction openings strengthened with FRP composite laminates

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