Design recommendations and comparative study of FRP and steel guyed towers

Alshurafa, Sami; Polyzois, Dimos

doi:10.1016/j.jestch.2018.06.014

Cited by 9 publications

(4 citation statements)

References 13 publications

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“…Local buckling was the most common mode of failure in the majority of the specimens because of the high radius-to-thickness ratio of the specimens [12]. Alshurafa and Polyzois's (2018) results confirmed that FRP towers will create more economically viable alternatives and sustainable solutions to steel towers in the future [13]. Altanopoulos et al (2021) concluded that it is possible to use the FEM with confidence in the analysis and design of GFRP structures, such as utility line poles and wind turbine towers, without the high cost associated with experimentation [14].…”

Section: Introductionmentioning

confidence: 90%

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: 90%

Behavior of Centrifuged GFRP Poles Under Lateral Deflection

et al. 2023

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“…The references [6][7][8] proposed some designs for composite towers from the point of view of the mechanical properties, but did not take the electrical performance of these designs into consideration. However, at operating voltages, the insulating surfaces may suffer from electric field distortion due to uneven wetting pollution [9,10].…”

Section: Introductionmentioning

confidence: 99%

Suppression Measures of Partial Discharge at Rod–Plate Connection in Composite Tower

Hao¹,

Huang²,

Fang³

et al. 2023

Energies

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Rods and plates at the connections in composite insulating material towers are commonly fixed to each other by metal bolts, which may cause electrical field distortion at the connections. So, the rod–plate connections are prone to partial discharge under polluted and wet conditions, and the resulting electric field and temperature changes can affect the mechanical and electrical performance of the whole tower. In this paper, an artificial pollution test synchronous observation platform with an infrared and visible light imager, leakage current, and voltage measurement was built to observe the dry band formation and partial discharge at the simplified rod–plate connections in the composite towers. Then, the electric field simulation of the rod–plate connection specimen showed the current density distribution. When combining the test and the simulation, it was concluded that the cause of the partial discharge was the distortion of the current density and, thus, measures to suppress the partial discharge at the rod–plate connections were proposed. Finally, it was verified that the measures can improve the current density distortion phenomenon, delay dry band formation, and effectively suppress the partial discharge at the rod–plate connections under the same test conditions.

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“…Circular tubes are widely used as components in various applications, including buckets, columns for buildings, shafts, poles, and oil storage tanks. Many researchers have studied circular tubes, in an attempt to increase their strengths and lowering the associated waste by improving the structures of tubes [1][2][3][4][5][6][7]. These structures comprised sandwiched sinusoidal lateral corrugated tubes and circular braided composite tubes, among others.…”

Section: Introductionmentioning

confidence: 99%

Optimized Design of Structure of High-Bending-Rigidity Circular Tube

2021

Sustainability

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Circular tubes are widely used in daily life and manufacture under bending load. The structural parameters of a circular tube, such as its wall thickness, number and shapes of ribs, and supporting flanges, are closely related to the tube’s bending rigidity. In this study, a tube with eight ribs and a flange was optimized, in order to obtain the lowest weight, through comprehensive structural optimization. We obtained the optimal structural parameters of the tube and the influence of the structural parameters on the tube’s weight. The structural parameters of tubes with different numbers of ribs were optimized. The tube with different number of ribs had the same inner diameter, bending load, and length as the tube with eight ribs. We conducted an experiment to verify the structural optimization simulation. Different tube sizes were subsequently optimized. The optimized tube with four trapezoidal ribs and a flange reduced the weight by more than 73% while maintaining the same deformation. The weight of the optimized tube with a flange reached a stable value after four trapezoidal ribs were added. When the number of ribs was two, the weight was the largest. The analysis results were consistent with the numerical results. A new AWATR (appropriate width and thickness of ribs can improve the bending rigidity of the tubes) formula was proposed, which can effectively improve the bending rigidity of tubes. Different shapes of tubes were optimized and compared. The optimized tube with four trapezoidal ribs and a flange was the lightest and easy to manufacture.

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Design recommendations and comparative study of FRP and steel guyed towers

Cited by 9 publications

References 13 publications

Behavior of Centrifuged GFRP Poles Under Lateral Deflection

Behavior of Centrifuged GFRP Poles Under Lateral Deflection

Suppression Measures of Partial Discharge at Rod–Plate Connection in Composite Tower

Optimized Design of Structure of High-Bending-Rigidity Circular Tube

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