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Hydrodynamic Pressure Load on Folsom Dam Tainter-Gate at Onset of Failure Due to Flow-Induced Vibrations

[+] Author Affiliations
Keiko Anami

Ashikaga Institute of Technology, Ashikaga, Tochigi, Japan

Noriaki Ishii, Tatsuya Oku

Osaka Electro-Communication University, Neyagawa, Osaka, Japan

Charles W. Knisely

Bucknell University, Lewisburg, PA

Paper No. PVP2005-71444, pp. 557-564; 8 pages
doi:10.1115/PVP2005-71444
From:
  • ASME 2005 Pressure Vessels and Piping Conference
  • Volume 4: Fluid Structure Interaction
  • Denver, Colorado, USA, July 17–21, 2005
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4189-8 | eISBN: 0-7918-3763-7
  • Copyright © 2005 by ASME

abstract

An analysis of a Folsom dam Tainter-gate which failed during operation in 1995 is presented. First, an empirical evaluation of the excessive push-and-draw hydrodynamic pressure induced by streamwise rotational vibration of the inclined circular-arc skinplate over the curved dam crest with a vertical step down at the upstream side is developed. This development is based on a theoretical analysis for a simplified flow field model. The simplified model consisted of a vertical flat rigid weir plate undergoing streamwise rotational vibration and a horizontal flat bed surface with a vertical step down at the gate position. Secondly, the resultant hydrodynamic load on the skinplate is determined. Thirdly, the dynamic instability of the Tainter-gate is theoretically examined and the major characteristics of this instability are presented. Finally, an FEM analysis of the structure reveals that the small vibration amplitude of at most 11.9mm at the spanwise center and bottom end of the skinplate induced the excessive hydrodynamic pressure load of about 1.6 times the static load, thus causing incipient failure of 4 bolts connecting a diagonal member to the main struts.

Copyright © 2005 by ASME

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