On the aerodynamic characteristics of inclined stay cable sheaths in the critical flow regime

Benidir, Adel; Flamand, Olivier; Dimitriadis, Grigorios

doi:10.1016/j.jfluidstructs.2020.103147

Cited by 3 publications

(7 citation statements)

References 25 publications

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“…The large dispersion in the lift coefficient in the critical regime can be explained in part by the asymmetric flow. 30 During a complete rotation, the sign of the lift coefficient in the critical flow regime changes, 15 since transition only occurs on one side in the TrBL1 regime. However, the most important observation is the variation of the mean drag coefficient in the critical flow regime which cannot be caused by low test repeatability or free stream turbulence.…”

Section: Mean Aerodynamic Coefficientsmentioning

confidence: 99%

“…Ref. [15] argued that the triggering mechanism of dry galloping could be linked to the non-stationary character of the aerodynamic loads. Accordingly, the only event that can be deemed non-stationary at the critical regime is the bistable flow activity.…”

Section: Introductionmentioning

confidence: 99%

“…It is important to mention that the presence of such loads has been observed before and after the steady TrBL1 state, so that high-amplitude vibrations can also occur before and after the TrBL1 regime, as reported respectively in Refs. [15,16].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Aerodynamic Instability of Circular Slender Structures Due to Bistable Flow Activity

Benidir¹,

Eng.

Prof.

et al. 2021

Structural Engineering International

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Slender structures with circular cylindrical cross-sections are very common in civil engineering, industrial equipment and bridge engineering. Such long cylinders subjected to wind are columns, piles, long cables, chimney, pylons and others. On long cables, an instability called dry galloping has been recently theorized to be linked to an unpredictable jump state occurring once the boundary layers of the circular cylinder changes from laminar to turbulent. With a non-stationary character, the force generated at the critical flow regime is named bi-stable activity. In this work, the birth of bi-stable flow activity around a circular cylinder made of high-density polyethylene is studied experimentally in a wind tunnel. The pressure pattern is linearly decomposed and geometric modes governing the bi-stable activity as a function of circularity defect are created. The results show that the energy of the nonstationary load observed at the critical flow regime depends strongly on the circularity defect. Furthermore, the inclination angle of 60°confers a significant increase in the energy of the bi-stable flow mode when an unsteady asymmetric reattachment event occurs. The paper also highlights the variability of the mean drag coefficient as a function of the macroscopic defect.

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Section: Mean Aerodynamic Coefficientsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Aerodynamic Instability of Circular Slender Structures Due to Bistable Flow Activity

Benidir¹,

Eng.

Prof.

et al. 2021

Structural Engineering International

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“…Stay cables are the main force-bearing structures of cable-stayed bridges, [1][2][3] and they are mainly composed of internal high-strength steel wires and external high-density polyethylene (HDPE) sheaths. 4 However, HDPE sheaths may be cracked or damaged for various reasons, 5 leading to corrosion of steel wires at the cracked part of the sheaths. 6,7 The impressed current cathodic protection (ICCP) technique is widely employed in the corrosion protection of marine ships, 8 reinforced concrete, 9 and buried pipelines.…”

Section: Introductionmentioning

confidence: 99%

“…Stay cables are the main force‐bearing structures of cable‐stayed bridges, 1–3 and they are mainly composed of internal high‐strength steel wires and external high‐density polyethylene (HDPE) sheaths 4 . However, HDPE sheaths may be cracked or damaged for various reasons, 5 leading to corrosion of steel wires at the cracked part of the sheaths 6,7 .…”

Section: Introductionmentioning

confidence: 99%

Corrosion evaluation of prestressed high‐strength steel wires with impressed current cathodic protection based on acoustic emission technique

Liang

Zhang

2022

Structural Contr & Hlth

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Summary The acoustic emission (AE) technique is a non‐destructive testing method widely used in various structural health monitoring fields, and it is highly sensitive to the emergence and development of material corrosion. This study developed a method of employing the AE technique to evaluate the corrosion degree of stay cable high‐strength steel wires under pre‐stress and impressed current cathodic protection (ICCP) in a simulated marine atmospheric rainwater environment. The variation characteristics of AE parameters under various pre‐stress levels and protection current densities were investigated. Results showed that the more negative the open circuit potentials (OCPs) and the greater the average corrosion rates, the higher the cumulative AE parameters. In the AE intensity analysis of corrosion damage for stay cable high‐strength steel wires, the constants J and the K were taken as 40 and 25 hits, respectively. The corrosion of steel wires was divided into no corrosion, slight corrosion, medium corrosion, and severe corrosion. The corrosion degree of specimens with ICCP was classified as no corrosion and slight corrosion, whereas that of unprotected specimens was classified as medium corrosion and severe corrosion.

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On the mechanism of divergent cable movement: Contribution of the bistable flow activity in the critical flow regime

Benidir¹,

Flamand

Dimitriadis

et al. 2022

Journal of Wind Engineering and Industrial Aerodynamics

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On the aerodynamic characteristics of inclined stay cable sheaths in the critical flow regime

Cited by 3 publications

References 25 publications

Aerodynamic Instability of Circular Slender Structures Due to Bistable Flow Activity

Aerodynamic Instability of Circular Slender Structures Due to Bistable Flow Activity

Corrosion evaluation of prestressed high‐strength steel wires with impressed current cathodic protection based on acoustic emission technique

On the mechanism of divergent cable movement: Contribution of the bistable flow activity in the critical flow regime

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