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Date of Publication:2018-01-01

Journal:船舶力学

Affiliation of Author(s):运载工程与力学学部

Volume:22

Issue:6

Page Number:758-770

ISSN No.:1007-7294

Abstract:Stress concentration factor (SCF) is considered as one of the random variables which great-ly affect the results of fatigue reliability assessment for the tubular joints and offshore jacket-type platform structures. In this study, 352 three dimensional finite element (FE) models of multi-planar circular hollow section (CHS) DT-joints with different geometric parameters are generated and the SCF distributions along the chord-brace intersection are analyzed. Several probability models com-monly used in the fatigue reliability analysis are fitted to the density histograms for statistical sam-ples of maximum SCFs. The values of parameters in each probability model are estimated by maxi-mum likelihood (ML) method. After the chi-squared goodness-of-fit test is performed, the Birn-baum-Saunders distribution is found to be the best fitted one. A set of probability density functions (PDFs) following Birnbaum-Saunders distribution are proposed for the maximum SCFs on the chord and the brace sides under two kinds of axial loading, i.e. single axial loading and balanced axial load-ing, respectively.

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