Reliability and adaptability of the analytical models proposed for the FRP systems to the Steel Reinforced Polymer and Steel Reinforced Grout strengthening systems

Bencardino, Francesco; Condello, Antonio

doi:10.1016/j.compositesb.2015.02.029

Cited by 15 publications

(6 citation statements)

References 22 publications

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“…Reinforced Cementitious Matrix (FRCM) [11,21], Fiber Reinforced Grout (FRG) [22][23][24]. Some studies highlighted both the effectiveness of inorganic based composite materials as EB strengthening system and the different bond behavior and load transfer mechanisms compared to FRP system [16,25,26,27].…”

Section: Introductionmentioning

confidence: 99%

Single-lap shear bond tests on Steel Reinforced Geopolymeric Matrix-concrete joints

Bencardino

Condello

Ashour

2017

Composites Part B: Engineering

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Nowadays Fiber Reinforced Polymers (FRPs) represent a well-established technique for rehabilitation of Reinforced Concrete (RC) and masonry structures. However, the severe degradation of mechanical properties of FRP under high temperature and fire as well as poor sustainability represents major weak points of organic-based systems. The use of eco-friendly inorganic geopolymeric matrices, alternative to the polymeric resins, would be highly desirable to overcome these issues. The present work aims to investigate the bond characteristic of a novel Steel Reinforced Geopolymeric Matrix (SRGM) strengthening system externally bonded to a concrete substrate having low mechanical properties. SRGM composite material consists of stainless steel cords embedded into a fireproof geopolymeric matrix. Single-lap shear tests by varying the bonded length were carried out. The main failure mode observed of SRGM-concrete joints was debonding at the fiber-matrix interface. Test results also suggest the effective bond length. On the basis of the experimental results, a cohesive bond-slip law was proposed.

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Section: Introductionmentioning

confidence: 99%

Single-lap shear bond tests on Steel Reinforced Geopolymeric Matrix-concrete joints

Bencardino

Condello

Ashour

2017

Composites Part B: Engineering

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“…Nonetheless, the FRP-sheet reinforcement method still has some drawbacks, such as the need for prior surface treatment, problems at joints, and relatively expensive material costs. Recently, to overcome the weakness of FRP, a new class of cement-based composites was introduced in the civil engineering field [9,10,11,12,13,14,15,16]. Thus, there is a continuing need for the development of new strengthening techniques with better workability and reduced costs for concrete columns.…”

Section: Introductionmentioning

confidence: 99%

A Seismic Strengthening Technique for Reinforced Concrete Columns Using Sprayed FRP

Lee

Seo

2016

Polymers

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Conventional methods for seismic retrofitting of concrete columns include reinforcement with steel plates or steel frame braces, as well as cross-sectional increments and in-filled walls. However, these methods have some disadvantages, such as the increase in mass and the need for precise construction. Fiber-reinforced polymer (FRP) sheets for seismic strengthening of concrete columns using new light-weight composite materials, such as carbon fiber or glass fiber, have been developed, have excellent durability and performance, and are being widely applied to overcome the shortcomings of conventional seismic strengthening methods. Nonetheless, the FRP-sheet reinforcement method also has some drawbacks, such as the need for prior surface treatment, problems at joints, and relatively expensive material costs. In the current research, the structural and material properties associated with a new method for seismic strengthening of concrete columns using FRP were investigated. The new technique is a sprayed FRP system, achieved by mixing chopped glass and carbon fibers with epoxy and vinyl ester resin in the open air and randomly spraying the resulting mixture onto the uneven surface of the concrete columns. This paper reports on the seismic resistance of reinforced concrete columns controlled by shear strengthening using the sprayed FRP system. Five shear column specimens were designed, and then strengthened with sprayed FRP by using different combinations of short carbon or glass fibers and epoxy or vinyl ester resins. There was also a non-strengthened control specimen. Cyclic loading tests were carried out, and the ultimate load carrying capacity and deformation were investigated, as well as hysteresis in the lateral load-drift relationship. The results showed that shear strengths and deformation capacities of shear columns strengthened using sprayed FRP improved markedly, compared with those of the control column. The spraying FRP technique developed in this study can be practically and effectively used for the seismic strengthening of existing concrete columns.

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“…The approaches adopted by CNR Italian Guidelines [12], Japanese Society of Civil Engineers guideline [76], ACI 440.2R-08 [77] and Fib Bulletin 14 [78] are discussed in [75], whereas reliability and adaptability of analytical models proposed for FRP composites to Steel Reinforced Polymer (SRP) systems is evaluated in [79].…”

Section: Bond Strength Modelsmentioning

confidence: 99%

A review on the bond behavior of FRP composites applied on masonry substrates

Bellini

Mazzotti

2017

RILEM Tech Lett

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The need of repairing and retrofitting masonry buildings, typical of Italian and European built heritage, determined a growing interest towards the development of effective and cost efficient innovative strengthening solutions. Among the different techniques currently available, the adoption of composite materials, such as Fiber Reinforced Polymers (FRPs), proved to be one of the most viable solutions for the strengthening of masonry structures. If not properly fixed, a common failure mode of this system is the early debonding of the reinforcement from the substrate. For this reason, several experimental tests and numerical analyses are currently available in the literature, clarifying and predicting the bond behavior of FRP glued to masonry substrates. The purpose of this paper is to provide an overview of the results obtained by the different experimental works, of the numerical analyses performed both for evaluating and validating experimental results and of the simplified analytical models currently available for the prediction of the maximum capacity of the strengthening systems. Results of extended experimental campaigns, carried out also within different Round Robin Test (RRT) series, with several laboratories involved, and recent model calibrations will be discussed together with the approach proposed by the actual guidelines.

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Reliability and adaptability of the analytical models proposed for the FRP systems to the Steel Reinforced Polymer and Steel Reinforced Grout strengthening systems

Cited by 15 publications

References 22 publications

Single-lap shear bond tests on Steel Reinforced Geopolymeric Matrix-concrete joints

Single-lap shear bond tests on Steel Reinforced Geopolymeric Matrix-concrete joints

A Seismic Strengthening Technique for Reinforced Concrete Columns Using Sprayed FRP

A review on the bond behavior of FRP composites applied on masonry substrates

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