Plastic collapse load prediction of cracked circular hollow section gap K-joints under in-plane bending. (November 2016)

• Record Type: Journal Article
• Authors: Lie, S.T.; Li, T.; Shao, Y.B.; Vipin, S.P.
• Is Part Of: Marine structures. Volume 50(2016)
• Page Start: 20
• Page End: 34
• Publication Date: 2016-11
• Subjects: Cracked CHS gap K-joints -- Finite element mesh generator -- Plastic collapse moment -- Strength reduction factor -- Surface crack; Naval architecture -- Periodicals; Offshore structures -- Periodicals; Architecture navale -- Périodiques; Structures offshore -- Périodiques; Naval architecture; Offshore structures; Periodicals; 620.4162
• DOI: 10.1016/j.marstruc.2016.06.002
• Languages: English
• ISSNs: 0951-8339

Abstract

Abstract: This paper reports the in-plane plastic collapse moment of cracked circular hollow section (CHS) gap K-joints containing a semi-elliptical surface crack located at the crown position. An in-house 3D finite element (FE) mesh generator is developed to create all the mesh models automatically. Firstly, in-plane plastic collapse moment applied to the uncracked CHS gap K-joints are investigated. Both Lu's deformation limit and twice elastic compliance are used to determine the in-plane plastic collapse moment. Consequently, an extensive parametric study is carried out to investigate the in-plane plastic collapse moment of the cracked joints. It is found that the crack has a significant influence on the in-plane plastic collapse moment. The decrease of the in-plane plastic collapse moment is up to 30.4% when the crack area A nc reaches up to 25%. The strength reduction factors of all the analyzed cracked CHS gap K-joints are calculated. Finally, a lower bound reduction factor F AR equation is proposed based on the FE results. Highlights: Create finite element mesh models of cracked CHS gap K-joints containing a surface crack at the weld toe of the chord. Carry out a parametric study to investigate the in-plane plastic collapse moment of cracked CHS gap K-joints. Propose an equation to predict the in-plane plastic collapse moments of cracked CHS gap K-joints.