Influence of infill concrete strength on the flexural behaviour of pultruded GFRP square beams

Muttashar, Majid; Manalo, Allan; Karunasena, Warna; Lokuge, Weena

doi:10.1016/j.compstruct.2016.02.071

Cited by 42 publications

(19 citation statements)

References 31 publications

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“…where A shear =2 x t w x b plate (24) and b plate represents the width of the bearing plate and f s is the inter-laminar shear strength of the section. Using this equation, the failure load of the filled beam sections was calculated and presented in Table 4.…”

Section: 2predicted Results and Comparison With The Experimentsmentioning

confidence: 99%

“…However, most hybrid composite beams failed in a brittle manner due to the failure in the adhesion between the pultruded section and the concrete layer [20]. In order to prevent the adhesion failure, several researchers completely filled the hollow composite sections with concrete instead of just bonding them on top flanges [21][22][23][24]. This approach is not optimal for applications governed by pure bending due to tension cracking in the concrete which decreases the concrete core contribution to the bending resistance [25].…”

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confidence: 99%

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Flexural behaviour of multi-celled GFRP composite beams with concrete infill: Experiment and theoretical analysis

Muttashar

Manalo

Karunasena

et al. 2017

Composite Structures

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This research introduces multi-celled glass fibre reinforced polymer (GFRP) beam sections partially filled with concrete. Pultruded GFRP square tubes (125 mm x125 mm x 6.5 mm) were bonded together using epoxy adhesives to form the beams using 2 to 4 cells. Concrete with 15 and 32 MPa compressive strengths was used to fill the top cell of the beams. These beams were then tested under static four-point bending and their behaviour was compared with hollow beams. The results showed that up to 27% increase in strength was achieved by multi-celled compared to a single cell beam. The beams with concrete infill failed at 38% to 80% higher load and exhibited 10 to 22% higher stiffness than their hollow counterparts. The increase in the compressive strength of the concrete infill from 15 MPa to 32 MPa resulted in up to 14% increase in the failure load but did not enhance the flexural stiffness. Finally, the proposed prediction equation which account for the combined effect of shear and flexural stresses showed a good agreement with the experimental results for hollow cells and up to 3 cells of concrete filled beams. The bearing stress equation gave a better estimation for 4-cell filled section. KeywordsComposite beam, multi-cell beams, concrete in-fill, flexural behaviour, theoretical prediction. All Tables.pdf [Table] To view all the submission files, including those not included in the PDF, click on the manuscript title on your EVISE Homepage, then click 'Download zip file'. RESEARCH PAPER AbstractThis research introduces multi-celled glass fibre reinforced polymer (GFRP) beam sections partially filled with concrete. Pultruded GFRP square tubes (125 mm x125 mm x 6.5 mm)were bonded together using epoxy adhesives to form the beams using 2 to 4 cells. Concrete

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Section: 2predicted Results and Comparison With The Experimentsmentioning

confidence: 99%

mentioning

confidence: 99%

Flexural behaviour of multi-celled GFRP composite beams with concrete infill: Experiment and theoretical analysis

Muttashar

Manalo

Karunasena

et al. 2017

Composite Structures

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“…Muttashar et al [7] also studied the influence of the concrete on the bending of hybrid beams formed by concrete-filled pultruded GFRP square tubes. The multicellular GFRP beams filled with concrete in the upper cell failured with 38% to 80% higher load and presented 10% to 22% higher stiffness than the corresponding hollow multicellular beams.…”

Section: Association Between Pultruded Profiles and Concrete For Applmentioning

confidence: 99%

Flexural behavior of hybrid GFRP - concrete railway sleepers

Azevedo

Teixeira

Carneiro

2019

Rev. IBRACON Estrut. Mater.

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This paper aims to present the flexural behavior of hybrid GFRP (glass fiber reinforced polymer) concrete beams as sleepers to railway application. It was tried to obtain sleepers with adequate mechanical resistance, not susceptible to corrosion, durable and lighter than the sleepers in prestressed concrete. Pultruded fiberglass and polyester resin profiles were filled with high strength concrete and polyolefin fiber in the following proportions by volume: 1% and 2.5%. The beams were 1.06 meters long and had a 76 mm x 76 mm x 6 mm cross section, corresponding to a reduced model in a 1: 2.64 scale of a 2.80 meters long sleeper. In the bending tests, the load was applied at the center of the sleeper, as provided in the Brazilian standard NBR 11709 (2015) and American standard AREMA (2016). During the tests the applied load, the vertical deflection and the longitudinal tensile and compression deformations were measured in the center of the span. The influence of fiber addition on the strength, rupture mode and flexural modulus of elasticity of the hybrid beams was analyzed. Finally, the hybrid sleeper performance was compared to that of the prestressed concrete monoblock sleeper. The results obtained were satisfactory, indicating that the proposed hybrid sleeper is a constructively and technically feasible alternative.

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“…Buckling of compressive flange and webs of the box beam could be prevented by placing stiffeners near the upper web–flange junctions [ 23 ]. Concrete infill prevented premature buckling and web crushing, thus increased the ultimate load by 100–141% compared to GFRP hollow beams tested under bending [ 24 ]. The ultimate load increased by 19% when the concrete compressive strength increased from 10 MPa to 43.5 MPa.…”

Section: Introductionmentioning

confidence: 99%

Shear Response of Glass Fibre Reinforced Polymer (GFRP) Built-Up Hollow and Lightweight Concrete Filled Beams: An Experimental and Numerical Study

et al. 2020

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This paper investigated the static behaviour of glass fibre reinforced polymer (GFRP) built-up hollow and concrete filled built-up beams tested under four-point bending with a span-to-depth ratio of 1.67, therefore focusing their shear performance. Two parameters considered for hollow sections were longitudinal web stiffener and strengthening at the web–flange junction. The experimental results indicated that the GFRP hollow beams failed by web crushing at supports; therefore, the longitudinal web stiffener has an insignificant effect on improving the maximum load. Strengthening web–flange junctions using rectangular hollow sections increased the maximum load by 47%. Concrete infill could effectively prevent the web crushing, and it demonstrated the highest load increment of 162%. The concrete filled GFRP composite beam failed by diagonal tension in the lightweight concrete core. The finite element models adopting Hashin damage criteria yielded are in good agreement with the experimental results in terms of maximum load and failure mode. Based on the numerical study, the longitudinal web stiffener could prevent the web buckling of the slender GFRP beam and improved the maximum load by 136%. The maximum load may be further improved by increasing the thickness of the GFRP section and the size of rectangular hollow sections used for strengthening. It was found that the bond–slip at the concrete–GFRP interface affected the shear resistance of concrete–GFRP composite beam.

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Influence of infill concrete strength on the flexural behaviour of pultruded GFRP square beams

Cited by 42 publications

References 31 publications

Flexural behaviour of multi-celled GFRP composite beams with concrete infill: Experiment and theoretical analysis

Flexural behaviour of multi-celled GFRP composite beams with concrete infill: Experiment and theoretical analysis

Flexural behavior of hybrid GFRP - concrete railway sleepers

Shear Response of Glass Fibre Reinforced Polymer (GFRP) Built-Up Hollow and Lightweight Concrete Filled Beams: An Experimental and Numerical Study

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