Ultimate limit state-based iterative structural analysis methods hold great potential to ease early-stage ship design. Such methods must be verified, however, before their results can be trusted. A key way to do so is to examine their behavior in known cases; that is, to set them working on well-known and thoroughly investigated problems to see if they produce the expected results. “Brokkr,” one such method, was tested in just such a way. First, a test hull was chosen, and the loading set used to develop it was researched. An analysis was then performed to determine the maximal stress levels induced in the hull by that loading set, revealing the safety factors the hull enjoys. A basic scantling model was then developed with the same overall size and material characteristics as the test hull, and was fed into Brokkr and iteratively modified to remain as light as possible by the same margin of safety and under the same loading conditions as the test hull. The design, generated using one overall safety factor, succeeded in maintaining the same margin of safety, but was significantly lighter. A second design created using a set of partial safety factors matched the test hull very closely in both mass and margin of safety. These results represent a successful verification and suggest that Brokkr has great utility for early-stage ship design. Further work is needed to additionally verify this code and to extend its use to more numerous and novel hull designs.
Verification of an Automated Structural Design Procedure Using Ultimate Limit States
Lecture Notes in Civil Engineering
Practical Design of Ships and Other Floating Structures ; 2019 ; Yokohama, Japan September 22, 2019 - September 26, 2019
2020-10-04
10 pages
Article/Chapter (Book)
Electronic Resource
English
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