Reference Type:  Journal Article
Record Number: 1
Author: Lie, S. T. and Yang, Z. M.
Year: 2008
Title: Bs7910:2005 failure assessment diagram (fad) on cracked circular hollow section (chs) welded joints
Journal: Advanced Steel Construction
Volume: 5
Issue: 4
Pages: 15
Start Page: 406
Short Title: Bs7910:2005 failure assessment diagram (fad) on cracked circular hollow section (chs) welded joints
DOI: 10.18057/IJASC.2009.5.4.3
Keywords: Crack; circular hollow section (CHS); failure assessment diagram (FAD); fracture toughness; K-joint; plastic collapse load; stress intensity factor
Abstract: The failure assessment diagram (FAD) has been widely accepted for assessing the safety and integrity of cracked and damaged metallic structures. Recently, the usage of this method for offshore structures has been validated extensively and included in the Annex B of BS7910 [1]. However, the recommended equations are valid only for uni-planar circular hollow section (CHS) T, Y, K and KT tubular welded joints. In this paper, an actual assessment has been carried out on cracked (CHS) tubular K-joint containing a surface crack located at the crown location. The fatigue crack depths a and lengths 2c vary from 3.30 mm to 20.83 mm and 70.40 mm to 191.78 mm respectively. The value of β, ratio of brace to chord diameter, is 0.52, which is within the validity range specified in the codes of practice. The recommended correction factor FAR, is used to calculate the plastic collapse load Pc, and the usage of BS7910 [1] Level 2A FAD for cracked CHS tubular K-joint is demonstrated accordingly.
Author Address: School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore