Page 279 - Marine Structural Design

Chapter I3 Collapse Analysis of Ship Hulls 255

(1 3.12)

and where b and t are plate Width and thickness,
respectively. The maximum initial deflection w, max and the residual stress or can be
determined by following Faulkner (1975). The reduction coefficient R, for the transverse
stress cr2 can be determined from:
forcompressiv o,
(1 3.13)
for tensib o,
where oZu is the ultimate stress of the plate subjected to uniaxial transverse compression. The
reduction coefficient R, for shear stress z is determined by:
R, = [1 - (z/z, )'Iv2 ( 1 3.14)

where,
z, =cy /%E (1 3.15)

b
f
b
1

(a) (b)
Figure 13.2 Stress Distribution after Buckling in Long and Wide Plate.
(a) Long Plate; @) Wide Plate

To calculate the stiffness of the plate part, a reduced effective width ge is introduced as:

(13.16)

For a wide plate (Figure 13.2), the ultimate effective width b, is determined by following
Hughes (1983):