POST-TENSIONED REINFORCED CONCRETE AS APPLIED TO SHIP DESIGN AND CONSTRUCTION

Post-tensioned reinforced concrete is a material which integrates the advantages of concrete, steel, reinforced concrete and pre-stressed concrete. Unlike ferro-cement (which has been limited to small boats) post-tensioned reinforced concrete has the potential for being applied to the construction of larger ships, such as LNG tankers. An investigation of material selection, engineering properties, permissible stresses under loading and design considerations (such as cracking, corrosion and concrete cover thickness) is followed by the application of post-tensioned reinforced concrete to a tanker midship section. There are several key parameters in the design of such a midship section, the three with the greatest impact on section modulus being concrete area, total steel area and modular ratio. One particularly significant conclusion is that, for a constant moment of inertia, the weight of a midship section can be reduced by increasing the modular ratio while decreasing the steel area and/or the concrete area. Furthermore, the steel stresses increase considerably, whereas the concrete tensile stress (the critical stress in post-tensioned reinforced concrete structures) is virtually unaffected. Order from BSRA as No. 49,208.

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  • Corporate Authors:

    American Society of Naval Engineers

    Suite 507, 1012 14th Street, NW
    Washington, DC  USA  20005
  • Authors:
    • Ertner, J D
  • Publication Date: 1977-4

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Filing Info

  • Accession Number: 00185309
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Jan 13 1979 12:00AM