Methods for ultimate limit state assessment of ships and ship-shaped offshore structures: Part II stiffened panels

Review and application of Artificial Neural Networks models in reliability analysis of steel structures

“…The considered pattern is represented in Figure 7, which is composed by the superposition of 4 different deflection shapes equivalent to buckling mode shapes, represented in Figures 7b-7e and given by: where wop, wow, woc and wos are the amplitudes of, respectively, the attached plating deflection, the stiffener web deflection, the stiffener column-type distortion and the stiffener sideways distortion. The design values of those amplitudes are usually assumed to be = /200, = 4 /200, = /1000, = /1000 according to [60], [65]. The number of buckling halfwaves in longitudinal direction is normally the integer of ratio of longer and shorter side of the plate ( = / ), and here is considered as m = 7.…”

Ultimate collapse strength assessment of damaged steel plated grillages

“…However, as noted by Paik et al [24], when considering the failure of a grillage arrangement a total of six possible failure modes may exist, whereby the "real ultimate strength is the minimum value of ultimate strengths obtained from the six solutions." [25].…”

“…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].…”

“…Modelling of the stiffened plate structure has been undertaken using the ANSYS 4-noded, quadrilateral, isoparametric shell element SHELL181 [25]. The element is suitable for undertaking the analysis of large strain non-linear plate structures and is capable of including membrane stresses as required by this study.…”

“…In all cases a grillage arrangement incorporating an additional half stiffener spacing of plating between the edge and nearest longitudinal stiffener has been included along the unsupported longitudinal edges, constrained using a symmetry boundary condition as described by Paik et al [25].…”