Testing and Evaluation of Polyurethane-Based GFRP Sandwich Bridge Deck Panels with Polyurethane Foam Core

Tuwair, Hesham; Volz, Jeffery S.; ElGawady, Mohamed A.; Mohamed, M.; Chandrashekhara, K.; Birman, Victor

doi:10.1061/(asce)be.1943-5592.0000773

Cited by 18 publications

(10 citation statements)

References 11 publications

(11 reference statements)

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“…As expected, the loadstrain curves presented a non-linear evolution of strain at the compression and tension side of the specimens. The load-strain evolution may be expected based on the behavior of the individual constituent materials comprising a sandwich structure [47]. The aluminium skin and EPS core used in this research were ductile in nature and typically respond in a non-linear fashion.…”

Section: Comparison Of Load-strain Behaviourmentioning

confidence: 99%

Flexural behaviour of hybrid sandwich panel with natural fiber composites as the intermediate layer

Fajrin¹,

Zhuge²,

Bullen³

et al. 2016

J. MECH. ENG. SCI.

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Polymeric composites reinforced with natural fibers have raised more attention as the alternative building materials. In this work, natural fiber composites prepared from jute and hemp fiber were proposed for the intermediate layer of a hybrid sandwich panel. This paper presented the flexural behavior of the newly developed hybrid sandwich panel which included the comparison of the ultimate load, load-deflection behavior, load-strain behavior and failure modes. The study was designed as a single factor experiment where the performance of hybrid sandwich panels containing jute fiber composite (JFC) and hemp fiber composite (HFC) as the intermediate layer was compared to the control (CTR) which was a conventional sandwich panel without an intermediate layer. A static flexural test under a four-point bending load scheme was performed in accordance with the ASTM C 393-00 standard. Aluminium sheet was used as the skins, while expanded polystyrene (EPS) was employed for the core. The testing was performed using a 100 kN servohydraulic machine with a loading rate of 5 mm/min. The applied load, displacement and strains were obtained using data logger. The results demonstrated that the hybrid sandwich panel exhibited a more superior performance than the conventional sandwich panels. The intermediate layer contributed significantly to enhancing the load carrying capacity of the hybrid sandwich panel. The load carrying capacity of hybrid panel with the JFC intermediate layer was 29.60% higher than the conventional sandwich panel, and correspondingly 93.46% higher for the sandwich panel with the HFC intermediate layer.The hybrid sandwich panels also developed a much larger area under the load-deflection curve, indicating greater toughness. The introduction of intermediate layer helped the hybrid sandwich panels to sustain a larger strain prior to reach their ultimate loads, resulting in a higher deformation capability. Indentation and core shear were observed as the failure mode of the conventional sandwich panel. Meanwhile, core shear and delamination were identified as the failure mode of the hybrid sandwich panel.

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Section: Comparison Of Load-strain Behaviourmentioning

confidence: 99%

Flexural behaviour of hybrid sandwich panel with natural fiber composites as the intermediate layer

Fajrin¹,

Zhuge²,

Bullen³

et al. 2016

J. MECH. ENG. SCI.

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show abstract

“…In addition, Abaqus 6.11 FE code was used to conduct numerical simulations of the developed panels. The results were verified and compared with the experimental results gathered from four-point bending tests conducted on the sandwich panels (Tuwair et al 2015b;Tuwair et al 2016). The verified FE model was then used to conduct a parametric study to investigate the effects of the stiffness of the top facesheet fiber layers, the mass density of the polyurethane foam, and the existence of an overlay on top of the deck on the deflection, initial stiffness, and strength of the GFRP panels.…”

Section: Introductionmentioning

confidence: 58%

“…They found that the simplified I-beam modeling approach was the most computationally efficient method for studying the overall performance of honeycomb sandwich panels. Tuwair et al (2015b) recently developed a new multicellular FRP bridge panel ( Fig. 1) in which the initial production costs and manufacturing difficulties were reduced while the system performance was improved.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Analysis of GFRP Bridge Deck Panels Filled with Polyurethane Foam

et al. 2016

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This paper presents finite-element analyses and analytical models of innovative, small-scale, prototype deck panels examined under monotonic bending. The deck panels consisted of two glass fiber-reinforced polymer (GFRP) facesheets separated by webs formed from E-glass-woven fabric placed around trapezoidal-shaped, low-density, polyurethane foam segments. The proposed panel exhibited a higher structural performance in terms of flexural stiffness, strength, and shear stiffness than those of conventional sandwich panels. Analytical models were used to predict critical facesheet wrinkling in the sandwich panel. Furthermore, a three-dimensional model using simulation software was developed for analysis of the proposed panel system under monotonic four-point loading. The finite-element results in terms of strength, stiffness, and deflection were found to be in good agreement with those from the experimental results. A parametric study was also conducted to further evaluate the effects of the stiffness of the top facesheet fiber layers, the mass density of the polyurethane foam, the existence of web layers, and the introduction of an overlay above the top facesheet. A flexural beam theory approach was used to predict the flexural strength of the sandwich panel.

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“…eir test results showed that specimens with trapezoid foam core had highest load carrying capacity under flexural loads and compression, due to the presence of shear layer. A similar approach of trapezoidalshaped polyurethane foam core was considered by Tuwair et al [11], who found that the shear webs contributed significantly to delaying the delamination of the skins from the core. e numerical analysis of Mostafa et al [12] showed that inserting shear keys between the GFRP facesheets and the PVC foam core would improve the shear resistance of the sandwich panels, and the panels with uniaxial shear keys had higher shear strength than the panels with bi-axial shear keys.…”

Section: Introductionmentioning

confidence: 86%

Flexural Behavior of Slab‐Rib Integrated Bridge Decks with GFRP Skin and Polyurethane Foam Core

Wang

Yadav

et al. 2020

Advances in Materials Science and Engineering

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This paper presents experimental and analytical studies on flexural behavior of slab-rib integrated Sandwich composite decks. The influences of layers of glass fiber-reinforced polymer (GFRP) facesheets, foam densities, and the existence of webs and cross beams are discussed herein. The test results showed that the existence of vertical webs remarkably improved the debonding of the facesheets from the foam core, thus increasing the ultimate load by 59% compared with the specimens without webs. However, the existence of horizontal webs has insignificant effect on the failure mode and ultimate load. Increasing the number of layers of GFRP facesheets from 2 to 4 and 6 results in 100% and 214% increments in ultimate loads, respectively, while the specimen with lower density of foam had a higher ultimate load than the specimen with higher density of foam due to deformation compatibility between GFRP skins and foam core with low density. The analysis software Abaqus Explicit was used to simulate the flexural behavior of test specimens, and the numerical results agreed well with the test data. The verified finite element model was extended to analyze the influences of the number of GFRP layers on the top of decks and the height of vertical webs. Based on equivalent method and compatibility of shear deformation, the flexural and shear rigidities were estimated. Then, analytical solution for displacement of the slab-rib integrated Sandwich composite decks subjected to four-point load was derived out. Comparison of analytical and experimental results shows that the displacements can be precisely predicted by the present theoretical model.

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Testing and Evaluation of Polyurethane-Based GFRP Sandwich Bridge Deck Panels with Polyurethane Foam Core

Cited by 18 publications

References 11 publications

Flexural behaviour of hybrid sandwich panel with natural fiber composites as the intermediate layer

Flexural behaviour of hybrid sandwich panel with natural fiber composites as the intermediate layer

Modeling and Analysis of GFRP Bridge Deck Panels Filled with Polyurethane Foam

Flexural Behavior of Slab‐Rib Integrated Bridge Decks with GFRP Skin and Polyurethane Foam Core

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