Smart Structures and Systems

  • 제18권3호
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  • Pages.485-500
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  • 2016
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Measurement of rivulet movement and thickness on inclined cable using videogrammetry

  • Jing, Haiquan (Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University) ;
  • Xia, Yong (Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University) ;
  • Xu, Youlin (Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University) ;
  • Li, Yongle (Department of Bridge Engineering, Southwest Jiaotong University)
  • 투고 : 2015.09.30
  • 심사 : 2016.05.17
  • 발행 : 2016.09.25
⟨ 이전 논문 다음 논문 ⟩

초록

Stay cables in some cable-stayed bridges suffer large amplitude vibrations under the simultaneous occurrence of rain and wind. This phenomenon is called rain-wind-induced vibration (RWIV). The upper rivulet oscillating circumferentially on the inclined cable surface plays an important role in this phenomenon. However, its small size and high sensitivity to wind flow make measuring rivulet size and its movement challenging. Moreover, the distribution of the rivulet along the entire cable has not been measured. This paper applies the videogrammetric technique to measure the movement and geometry dimension of the upper rivulet along the entire cable during RWIV. A cable model is tested in an open-jet wind tunnel with artificial rain. RWIV is successfully reproduced. Only one digital video camera is employed and installed on the cable during the experiment. The camera records video clips of the upper rivulet and cable movements. The video clips are then transferred into a series of images, from which the positions of the cable and the upper rivulet at each time instant are identified by image processing. The thickness of the upper rivulet is also estimated. The oscillation amplitude, equilibrium position, and dominant frequency of the rivulet are presented. The relationship between cable and rivulet variations is also investigated. Results demonstrate that this non-contact, non-intrusive measurement method has good resolution and is cost effective.

키워드

과제정보

연구 과제 주관 기관 : Council of Hong Kong

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피인용 문헌

  1. In-plane modal frequencies and mode shapes of two stay cables interconnected by uniformly distributed cross-ties vol.417, 2018, https://doi.org/10.1016/j.jsv.2017.12.004
  2. Excitation mechanism of rain–wind induced cable vibration in a wind tunnel vol.68, 2017, https://doi.org/10.1016/j.jfluidstructs.2016.10.006
  3. Parametric studies on the dynamic properties of stay cables interconnected with uniformly distributed cross-ties pp.2048-4011, 2018, https://doi.org/10.1177/1369433218786544
  4. Experimental verification of the effectiveness of elastic cross-ties in suppressing wake-induced vibrations of staggered stay cables vol.167, pp.None, 2016, https://doi.org/10.1016/j.engstruct.2018.04.033
  5. Development of a full-scale magnetorheological damper model for open-loop cable vibration control vol.23, pp.6, 2016, https://doi.org/10.12989/sss.2019.23.6.553
  6. Thickness Measurement of Water Film/Rivulets Based on Grayscale Index vol.11, pp.23, 2016, https://doi.org/10.3390/rs11232871