The Effective Flexural Modulus of Filament Wound GRP Tapered Poles

Skender, Ana; Domitran, Zoran; Krokar, Jakov

doi:10.17559/tv-20191108160438

Cited by 2 publications

(2 citation statements)

References 25 publications

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“…Donato (2020) findings showed that a mechanically safe and functional (stiff) GFRP shaft results in significant weight savings (37-80%) compared to traditional steel shafts [20]. In 2020, Skender et al concluded that the replacement flexural modulus is a matrix-dominated property highly influenced by the fiber volume fraction [21]. The analysis of the literature showed that there is still a gap that has to be filled in order to increase the structural toughness of poles and enhance their dynamic reaction when struck by moving vehicles.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Centrifuged GFRP Poles Under Lateral Deflection

et al. 2023

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Centrifugal-manufactured GFRP pipes are widely used today as lighting and low-power transmission poles due to their lightweight, high electrical insulation, low cost, and corrosion resistance. Despite these advantages, GFRP poles suffer high deflection problems due to their low elastic and shear moduli values. In order to overcome this disadvantage, three techniques were suggested to control the lateral deflection of the GFRP poles: an extended internal steel stub, external steel angles, and internal steel bracing bars. The main objective of this study is to determine the optimum strengthening technique to improve the serviceability of GFRP poles in terms of lateral deflection according to ASTM D4923. An experimental research program containing five full-scale GFRP poles was carried out to determine the optimum strengthening technique and the effect of connectors opening near the base and compare it to previous research. The results indicated that flexural stiffness was increased by 44%, 66%, and 38% for the extended stub, steel angles, and bracing bars, respectively. Besides that, the reduction in flexural stiffness due to connector opening was about 8%. The measured deflections showed good matching with simplified mathematical calculations, and the division was about ±10%. The external steel angle technique showed the best efficiency in Stiffness behavior. Doi: 10.28991/CEJ-2023-09-06-07 Full Text: PDF

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Section: Introductionmentioning

confidence: 99%

Behavior of Centrifuged GFRP Poles Under Lateral Deflection

et al. 2023

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“…The literature review revealed that few experimental and FE studies have been conducted on full-scale specimens of GFRP poles under lateral loads, the majority of which focused on embedded poles without studying the interaction of anchored poles with concrete foundations [24][25][26][27][28]. Additionally, there is still a gap that needs to be bridged to promote the toughness of poles statically and thereby improve their dynamic response when impacted by vehicles.…”

Section: Introductionmentioning

confidence: 99%

Effect of Supporting Base System on the Flexural Behavior and Toughness of the Lighting GFRP Poles

Nawar

Kaka²,

El‐Zohairy³

et al. 2022

Sustainability

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Due to the high risk of common traffic electric poles, the use of glass fiber reinforced polymer (GFRP) material in electric poles has become essential due to its excellent advantages such as high strength to weight ratio, corrosion resistance, and electrical insulation, which keeps people safe. To reduce the accidental effect of street lighting poles on humans, the generated energy during the collision must be absorbed. Experimental and numerical investigations were carried out to identify the efficiency of tapered GFRP electric poles with handle doors using steel sleeve bases until the occurrence of failure. Six full-scale cantilever bending tests were performed to investigate the strength and ductility of the GFRP pole. Moreover, finite element (FE) models were developed using Abaqus software and verified against tests to provide alternative tools instead of lab experiments. An extensive parametric study was carried out to predict the effect of the GFRP pole wall thickness, base plate geometric (length, diameter, and wall thickness), electric cable hole diameter, material properties, and base sleeve geometric (length and wall thickness) on the toughness of the GFRP pole. Based on the results of the load–displacement (P–Δ) curves, the flexibility of the GFRP poles was directly proportional to their length and the local buckling failure often occurred at the handle door. Strengthening the zone of the handle door using a steel ring was investigated to prevent the local buckling failure at this part. However, the wall thickness of the GFRP pole, base sleeve height, base plate dimensions, and base plate material properties were the most effective parameters to enhance accidental energy absorption through large deformation kinematics. The base sleeve thickness had a slight direct effect on the ductility and toughness of the GFRP pole.

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The Effective Flexural Modulus of Filament Wound GRP Tapered Poles

Cited by 2 publications

References 25 publications

Behavior of Centrifuged GFRP Poles Under Lateral Deflection

Behavior of Centrifuged GFRP Poles Under Lateral Deflection

Effect of Supporting Base System on the Flexural Behavior and Toughness of the Lighting GFRP Poles

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