Abstract
AbstractThe reassessment of existing structures leads to analyse the impact of local defects on the structural behaviour. This paper proposes a cracked beam finite element with a view to introducing the effect of large through‐cracks in the structural analysis for framed structures like jacket offshore platforms. The model parameters are identified for several joint typologies using 3D finite element results. Copyright © 2007 John Wiley & Sons, Ltd.
Highlights
The study of the impact of through-cracks on the structural integrity of offshore structures such as jacket platforms is still a challenge
The cracked beam finite element (CBFE) proposed in this paper enables one to consider all geometrical typologies of nodes which are encountered on jacket structures
In order to compare the force method with the CBFE model proposed we have extended the aforementioned expression to the 3D case
Summary
The study of the impact of through-cracks on the structural integrity of offshore structures such as jacket platforms is still a challenge. The purpose of this paper is to build a finite element representing the behaviour of a through-cracked tube. The paper depicts how to transfer the main mechanical effects of a through-crack to the structure behaviour using an equivalent cracked beam finite element (CBFE). The CBFE proposed in this paper enables one to consider all geometrical typologies of nodes which are encountered on jacket structures. We describe the cracked beam by introducing four mechanical parameters (two stiffnesses and two eccentricities). The through-crack is modelled as a loss of stiffness which is represented by two torsional springs and two eccentricities due to the shift of neutral axis of the tube. Applying an axial force leads to a momentum at the cracked section This effect is significant when analysing framed structures such as jackets offshore platforms
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