Abstract
In this study, the structural reliability of plate-stiffened prismatic pressure vessels was analyzed over time. A reliability analysis was performed using a time-dependent structural reliability method based on the response surface method (RSM). The plate-stiffened prismatic pressure vessel had a rectangular cross-section with repeated internal load-bearing structures. For the structural analysis, this repeated structure was modeled as a strip, and a structural reliability analysis was performed to identify changes in the reliability index when general corrosion and pitting corrosion occurred in the outer shell. Pitting corrosion was assumed to be randomly distributed on the outer shell, and the reliability index according to the degree of pit (DOP) and time was analyzed. Analysis results confirmed that the change in the reliability index was larger when pitting corrosion was applied compared with when only general corrosion was applied. Additionally, it was confirmed that above a certain DOP, the reliability index was affected.
Highlights
In this study, the structural reliability of plate-stiffened prismatic pressure vessels was analyzed over time
After repeating Steps 1, 2, and 3, it was confirmed whether the structural reliability analysis result of the limit state function manufactured through response surface method (RSM) came within the target reliability, and using the general and pitting corrosion models, the change of analysis results according to the change of time were examined
After fabricating and analyzing the strip model for the plate-stiffened prismatic pressure vessel, it was confirmed that the stress value was 167.5 MPa, which was an extremely low value compared with the allowable strength
Summary
The structural reliability of plate-stiffened prismatic pressure vessels was analyzed over time. Reliability is a basic concept in structural design that considers uncertainties in loads and material properties, and structural reliability is crucial in determining whether a structure is safe. Many methodologies, such as the FORM, SORM, and MCS have been applied in various fields to evaluate the reliability or failure probability of structures [3,4]. Joung et al (2017) [10] obtained structure reliability using various reliability analysis techniques for the load-out support frame in the offshore installation
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