Behavior of one-way RC slabs flexurally strengthened with prestressed NSM CFRP laminates – Assessment of influencing parameters

Hosseini, Mhoammadreza Mostakhdemin; Dias, Salvador J. E.; Barros, Joaquim A. O.

doi:10.1016/j.compstruct.2020.112259

Cited by 8 publications

(3 citation statements)

References 17 publications

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“…ey found that the effect of the resin binder on the enhancement of the bearing capacity was stronger than that of cement as a binder, and steel bars as embedded reinforcement was better for constraint member cracking than FRP bars. Similar studies were performed by Hosseini et al [152], who applied different prestress levels to NSM CFRP laminates in reinforced concrete slabs. e experimental results indicated that the bearing capacity at the serviceability and ultimate limit states increased significantly as the prestress increased.…”

Section: Near-surface Mounted Frp Nsm Frp Is An Improved Version Of the Traditional Eb Frp Methodssupporting

confidence: 64%

Review of Experimental Studies on Application of FRP for Strengthening of Bridge Structures

Yuan

2020

Advances in Materials Science and Engineering

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In recent years, fiber-reinforced polymer (FRP) composites have been widely used as a new type of high-performance material in concrete structures. FRP composites have the advantages of high strength, light weight, and corrosion resistance. Based on existing studies in the literature, this paper reviews the development and applications of FRP materials for the strengthening and rehabilitation of bridge structures. The types and properties of FRP composites are summarized, and the applications and development of FRP sheets, FRP bars, FRP grids, and prestressed FRP tendons for bridge structures are discussed. Different types of FRP composites result in different failure characteristics and bearing capacities. Moreover, this paper covers the FRP strengthening methods and the response properties of the flexural performance, bonding performance, and ductility. Significant conclusions regarding the strengthening/repair of bridge structures with FRP composites are presented. The review details the current state of knowledge and research on strengthening bridge structures with FRP composites and is helpful for better understanding and establishing design criteria.

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Section: Near-surface Mounted Frp Nsm Frp Is An Improved Version Of the Traditional Eb Frp Methodssupporting

confidence: 64%

Review of Experimental Studies on Application of FRP for Strengthening of Bridge Structures

Yuan

2020

Advances in Materials Science and Engineering

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“…These techniques can be classified into two main categories: externally bonded (EB) and near-surface-mounted (NSM). These two methods have been used widely when strengthening or repairing concrete structures and will be described in the following paragraphs [25][26][27]. The EB-FRP method was the initial technique employed for the rehabilitation of structures using FRP materials.…”

Section: Introductionmentioning

confidence: 99%

Repairing of One-Way Solid Slab Exposed to Thermal Shock Using CFRP: Experimental and Analytical Study

Shhabat,

Ashteyat,

Abdel-Jaber

2024

Fibers

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This research was conducted to investigate, experimentally, theoretically, and numerically, the use of CFRP materials for repairing a reinforced concrete one-way solid slab exposed to thermal shock. Nine slabs, measuring 1800 mm in length, 500 mm in width, and 100 mm in depth, were cast. Seven of these slabs underwent thermal shock at a temperature of 600 °C, rapidly cooled by immersion in water for 15 min. Three primary parameters were examined: the type of CFRP (rope, strip, and sheet), spacing (100 and 200 mm), and the number of sheet layers (one and two). The experimental results revealed a significant decrease of approximately 45.4% in the compressive strength of the concrete after exposure to thermal shock. The thermally shocked RC slab showed a reduction in ultimate capacity by 15.4% and 38.5% in stiffness compared to the control slab. The results underscored the efficacy of CFRP materials, with all repair configurations exhibiting a substantial increase in maximum load capacity and stiffness. Capacity enhancement ranged from 23.7% to 53.4%, while stiffness improvement ranged from 27.6% to 57.1%. Notably, all repair configurations effectively minimized the maximum deflection. This reduction in deflection ranged from 5.2% to 26% compared to the control slab. Numerical results demonstrated strong concurrence with experimental results for both capacity and deflection. The enhancement in capacity ranged from 0.7% to 10.4%, while deflection decreased within a range from 0.95% to 14.16% compared to experimental results.

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“…[15][16][17][18] In the past few years, this technique has been used for strengthening masonry walls 19,20 and timber structural members. 21,22 Numerous studies were published on the use of this technique for strengthening RC beams and slabs. [23][24][25] A comprehensive presentation on the analysis and design procedures is presented in ACI PRC-440.2-17 26 with a comprehensive design example in Section 16.4.…”

Section: Introductionmentioning

confidence: 99%

Structural evaluation of RC overhang cantilever slab strengthened with FRP near‐surface mounted (NSM) composites for bridge applications

Mosallam,

Ghaban,

Mirnateghi

et al. 2023

Structural Concrete

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This paper presents the findings of a large‐scale experimental study that focus on assessing structural behavior of reinforced concrete (RC) cantilever slabs with carbon/epoxy fiber‐reinforced polymer (CFRP) composite strips using a near‐surface‐mounted (NSM) approach. The NSM/CFRP system evaluated in this study was implemented in strengthening the shoulders of the Slide Canyon Bridge in California, USA. The experimental phase is divided into two main parts: (i) determining the design parameters for NSM, including the bondline strength through pull‐out tests, and (ii) conducting a practical evaluation of the bending behavior of original and retrofitted RC cantilever slabs, each with varying NSM reinforcement and three different development lengths. Results of this study indicated that the use of NSM‐CFRP has a considerable benefit in that it significantly improves ductility and changes the failure mode of the unstrengthened RC slab from the typical brittle shear‐based failure mode to a more ductile flexural‐based failure mode. The large‐scale slab specimens' performances, which had different development lengths, showed little variance, except for the slab specimen with a development length of 457.0 mm that exhibited an appreciable flexural stiffness as compared to other specimens evaluated in this study. In order to simulate the serviceability and ultimate behavior of the RC slab specimens, linear and nonlinear finite element analyses were performed. A satisfactory agreement between numerical and experimental results was achieved especially at load level prior the initiation of large‐size cracks.

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Behavior of one-way RC slabs flexurally strengthened with prestressed NSM CFRP laminates – Assessment of influencing parameters

Cited by 8 publications

References 17 publications

Review of Experimental Studies on Application of FRP for Strengthening of Bridge Structures

Review of Experimental Studies on Application of FRP for Strengthening of Bridge Structures

Repairing of One-Way Solid Slab Exposed to Thermal Shock Using CFRP: Experimental and Analytical Study

Structural evaluation of RC overhang cantilever slab strengthened with FRP near‐surface mounted (NSM) composites for bridge applications

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