Design Contours for Complex Marine Systems

Harleigh C. Seyffert*, Austin A. Kana, Armin W. Troesch

*Corresponding author for this work

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

2 Citations (Scopus)
17 Downloads (Pure)


This paper examines the performance of 6 stiffened ship panel designs in different operational profiles. The main question of interest is: which sea states will lead to the worst panel performances in terms of reliability? As stiffened panel collapse is governed by combined lateral and in-plane loading effects (non-linear functions of the wave environment) this is not a simple problem and does not easily fit into the confines of traditional analyses. Interesting sea states for stiffened panel collapse are identified by a low-order design contour method which uses order statistics and extreme value theory. The resulting multimodal design contours pinpoint areas of interest and the panel performances are confirmed using a higher-order reliability analysis: the non-linear Design Loads Generator process. Such results have impact for creating and interpreting environmental and design contours, as well as assumptions about which operational profiles will lead to the worst system responses.

Original languageEnglish
Title of host publicationPractical Design of Ships and Other Floating Structures
Subtitle of host publicationProceedings of the 14th International Symposium, PRADS 2019
EditorsTetsuo Okada, Yasumi Kawamura, Katsuyuki Suzuki
PublisherSpringer Science+Business Media
ISBN (Electronic)978-981-15-4672-3
ISBN (Print)978-981-15-4671-6
Publication statusPublished - 2021
Event14th International Symposium on Practical Design of Ships and Other Floating Structures, PRADS 2019 - Yokohama, Japan
Duration: 22 Sep 201926 Sep 2019

Publication series

NameLecture Notes in Civil Engineering
Volume64 LNCE
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565


Conference14th International Symposium on Practical Design of Ships and Other Floating Structures, PRADS 2019

Bibliographical note

Accepted Author Manuscript


  • Combined non-Gaussian loading
  • Design contours
  • Environmental contours
  • Reliability
  • Return period of extreme responses


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