POTENTIAL FAILURE OF SURFACE SHIP AND SUBMARINE DRYDOCK BLOCKING SYSTEMS DUE TO SEISMIC LOADINGS AND RECOMMENDED DESIGN IMPROVEMENTS

U.S. naval shipyards are located in regions where significant earthquakes occur. This paper describes a nonlinear material model for drydock block caps. It is determined that submarine drydock blocking systems would fail at accelerations that are significantly lower than the Navy's 0.2 g survival requirement. Natural rubber caps and dynamic isolators are analyzed to determine their potential for increasing system survivability. When incorporated in blocking systems, significant increases in survivability occur; however, eleven submarine systems studied still fall well below the required level. A three-degree-of-freedom submarine drydock blocking system computer-aided design package is developed. The computer program is verified by a case study of the USS LEAHY (CG-16) earthquake sliding failure. System survivability using site-specific earthquakes with differing frequency spectrums is studied. Two adequate design solutions are found. The low-stiffness solution uses dynamic isolators and rubber caps, and the high-stiffness solution uses wale shores and rubber caps.

  • Supplemental Notes:
    • Transactions paper
  • Authors:
    • Hepburn, R D
    • Luchs, J K
    • Karr, D G
  • Publication Date: 1988

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Filing Info

  • Accession Number: 00658102
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM