STRESS REDESIGN BY LARGE ADMISSIBLE PERTURBATIONS

The goal of the large admissible perturbations approach to redesign is to find without trial and error or repeated finite element analyses a new structural design which satisfies a set of performance specifications. Differences in performance and sizing between baseline and objective designs of the order of 100% are achieved. In previous work, structures have been redesigned to satisfy modal dynamic, static deflection, and buckling objectives; and analyzed to correlate finite element models to physical structures, compute a redundancy mapping and the reliability index. In this paper, the large admissible perturbations theory is developed to obtain an objective design of specified stress level. Stress general perturbation equations are derived relating the two designs implicitly. A stress redesign algorithm is developed and implemented in code RESTRUCT. Several numerical applications are used to verify the algorithm by redesigning an offshore tower to achieve simultaneous stress, natural frequency, and static deflection objectives. Computational accuracy remains high in spite of the fact that stresses are computed indirectly in the baseline finite element analysis.

  • Supplemental Notes:
    • BOSS '94, 7th Intl Conf on the Behaviour of Offshore Structures; 12-15 July 1994; Massachusetts, USA. Procs. Publ by Pergamon, ISBN 0 08 041915 1. Vol 3, p 201 [12 p, 21 ref, 6 tab, 4 fig]
  • Authors:
    • Kang, B
    • Bernitsas, M M
  • Publication Date: 1994

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00717054
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 4 1996 12:00AM