Accession Number : ADA330932

Title :   Assessment of Reliability of Existing Ship Structures Appendices

Descriptive Note : Final rept.

Corporate Author : MANSOUR ENGINEERING INC BERKELEY CA

Personal Author(s) : Mansour, A. ; Wirsching, P. ; Luckett, M. ; Plumpton, A.

PDF Url : ADA330932

Report Date : 30 APR 1997

Pagination or Media Count : 167

Abstract : A detailed approach has been developed for assessing structural safety and reliability of ships. The methodology provides a means for determining reliability levels associated with a hull girder, stiffened panel and unstiffened plate modes of failure. Procedures for estimating the non-linear extreme sea loads and structural strength which are required for the reliability analysis have been developed. Fatigue reliability of ship structural details was also addressed and further developed. The methodology was demonstrated on four ships; two cruisers, a double hull tanker and an SL-7 containership. Reliability levels associated with each mode of failure of these ships were determined and compared. Sensitivity analysis has been conducted which provides sensitivity of a safety index to variations in design variables associated with extreme loading conditions as well as with fatigue loads. Recommendations are made of target reliability levels for each ship type and failure mode. Design variables that have the highest impact on reliability have been identified and some guidelines are provided for improving design criteria.

Descriptors :   *STRUCTURAL ANALYSIS, *SHIPBUILDING, *BOAT AND SHIP SAFETY, *STRUCTURAL INTEGRITY, STRENGTH(MECHANICS), STRUCTURAL RESPONSE, FATIGUE(MECHANICS), FAILURE(MECHANICS), SKIN(STRUCTURAL), SHIP HULLS, CONTAINERSHIPS, BENDING MOMENTS, TANKER SHIPS, SHIP PLATES, SEAWORTHINESS, CRUISERS.

Subject Categories : Marine Engineering
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE