Derivation of the probability density functions for the local joint flexibility factors in axially loaded two-planar tubular DK-joints of offshore structures

Ahmadi, Hamid ORCID: https://orcid.org/0000-0002-6192-6275 and Mayeli, Vahid (2020) Derivation of the probability density functions for the local joint flexibility factors in axially loaded two-planar tubular DK-joints of offshore structures. Journal of Civil and Environmental Engineering.


Abstract

Probability density functions of the involved random variables are essential for the reliability-based design of offshore structures. The objective of present research was the derivation of probability density function (PDF) for the local joint flexibility (LJF) factor, fLJF, in two-planar tubular DK-joints commonly found in jacket-type offshore structures. A total of 162 finite element (FE) analyses were carried out on 81 FE models of DK-joints subjected to two types of axial loading. Generated FE models were validated using available experimental data, FE results, and design formulas. Based on the results of parametric FE study, a sample database was prepared for the fLJF values and density histograms were generated for respective samples based on the Freedman-Diaconis rule. Nine theoretical PDFs were fitted to the developed histograms and the maximum likelihood (ML) method was applied to evaluate the parameters of fitted PDFs. In each case, the Kolmogorov-Smirnov and chi-squared tests were used to evaluate the goodness of fit. Finally, the Inverse Gaussian model was proposed as the governing probability distribution function for the fLJF. After substituting the values of estimated parameters, two fully defined PDFs were presented for the fLJF in tubular DK-joints subjected to two types of axial loading.


Statistics for USQ ePrint 50523
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 28 Jul 2022 05:31
Last Modified: 01 Aug 2022 03:49
Uncontrolled Keywords: Tubular DK-joint, LJF factor, Probability density function (PDF), Inverse Gaussian model, Goodness-of-fit test
Fields of Research (2020): 40 ENGINEERING > 4015 Maritime engineering > 401504 Ship and platform structures (incl. maritime hydrodynamics)
40 ENGINEERING > 4005 Civil engineering > 400510 Structural engineering
49 MATHEMATICAL SCIENCES > 4905 Statistics > 490501 Applied statistics
Socio-Economic Objectives (2020): 17 ENERGY > 1708 Renewable energy > 170808 Wind energy
Identification Number or DOI: doi:10.22034/JCEE.2020.11022
URI: http://eprints.usq.edu.au/id/eprint/50523

Actions (login required)

View Item Archive Repository Staff Only