Ultimate collapse strength assessment of damaged steel-plated structures

Abstract

In an unpredictable world where human intervention or unexpected environmental conditions can prevail, damage can occur to manmade structures. Whilst structural design allows for redundancy, or a structural capability beyond the general working load of the structure, it is necessary to be able to analyse and understand the residual capability of a damaged structure to ensure the safety of personnel in the vicinity of the structure and assess the potential to facilitate repair.Idealised Structural Unit Method (ISUM) can allow rapid assessment of large structural arrangements by simplification into smaller constituent parts, which are assessed against pre-calculated failure data for each part. The method has potential benefits for allowing rapid assessment of damaged steelplated structure that would otherwise require the use of high fidelity modelling of the entire structures, such as through the use of finite element analysis. This paper presents a study on the use of ISUM to assess damaged steel-plated structures and its limitations through the collapse analysis of stiffened steel panels. A new ISUM is proposed for strength assessment of damaged structural arrangements. Analysis is undertaken to assess the effects of geometrical and material property variations that can occur in a structure as well as the effects of damage aperture size and shape on the collapse strength of stiffened steel panels. The study shows 2 that while ISUM can be applied in the assessment of damaged steel-plated structures, implementing the proposed new ISUM allows greater accuracy in the calculation of the collapse strength of damaged stiffened steel panels. The paper also concludes that the assessment of larger structural units for application in the ISUM assessment, will allow the effects of the damage on surrounding structure to be captured, which can influence the deflection shapes that will lead to collapse of the structure.

Ultimate collapse strength assessment of damaged steel plated grillages

“…This method is discussed in more detail by Underwood et al [19] and summarised later in Section 4 of this paper.…”

“…Previous analysis by the authors [19] has shown that the damage aperture shape has minimal effect on the overall collapse strength of stiffened panels.…”

“…Within the area of structure immediately surrounding the damage aperture, the triangular form of the SHELL181 element has been used as a filler element. This approach is recommended by the software developers and previously employed by the authors in prior damaged plate studies [17][18][19] and Suneel Kumar et al [14] on the effect of circular openings on the strength of stiffened-plate structure.…”

“…4 ) 0.326x10 6 1.263x10 6 The modelling arrangement and boundary conditions used within the FE modelling have been created drawing on previous work undertaken by the authors to model damaged stiffened panels [17][18][19] and guidelines for the use of FEA for the ultimate strength assessment of stiffened panels [12,25,27].…”

“…Previous work by the authors [17,18,19] has shown how damage can affect the collapse modes that form in the surrounding undamaged plating for scenarios where a stiffened panel, under axially compressive load along its longitudinal stiffeners, has sustained damage in the form of a hole. In these cases the supporting transverse frames are not damaged.…”