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Nauticus Hull User Manual
PULS
ProgramVersion 10.5 / PULS Version 2.0.6
2003
September 2006
i) Improvements of local shear
buckling model
ii) New non-linear global buckling
model with lateral pressure option.
Consequence: For most geometries
new model gives same in-plane
ULS strength prediction than
version 1.4 for default
imperfections settings. However,
new model gives improved and
more realistic ULS estimates for
tolerance exceed.
iii) lateral pressure included
iv) Modified local buckling theory
for coping with three types of
secondary transverse stiffening;
sniped stiffeners, tripping stiffeners
and tripping brackets
v) Modified imperfection model for
high and slender stiffeners; added a
short wave local pattern for axially
compressed panels having a min.
eigenmode in local (1,1) mode.
Consequence: Predicts more
conservative and realistic ULS
strength (than 1.4) for axially
compressed panels with very high
webs and flanged profiles
v) Updated aluminium model with
HAZ corrections
vi) aspect ratio of plate between
stiffeners from 14 ( PULS 1.4) to
range 0.25 - 10 for covering cases
with closely spaced secondary
stiffeners
Improvements of unstiffened plate
U1 theory:
i) Updated aluminium model with
HAZ corrections
- New 3D graphics
visualizing cont.
stiffeners in S2 element
(x1-direction).
3D graphics in panel
tree menu: eigenmodes,
imperfection modes,
ULS modes/stresses, S2
lateral pressure
graphics: pure global
pressure deflections
- New: Three options for
secondary transv.
stiffeners; sniped
stiffeners, tripping
stiffeners or tripping
brackets.
- New: Standard
parameter output list –
placed in a separate tab
strip under “detailed
result” folder. It gives
linear parameters such as
cross-sectional data,
moment of inertia of
stiffener/plate unit etc.
- Animation of nonlinear buckling
response: separate
menu on tool bar for
animation of non-linear
buckling response (NB!
may take long time for
thin plates and cases
with much elastic
buckling; 10-15
minutes)
- Lateral pressure as
“preload” in Capacity
Curves modus.
- Separate option in
“capacity curves
settings”: GEB cut-off
and scaling of ULS
capacity curve as
allowable usage factor.
This gives the capacity
curves as “required
strength envelope”.
2.0
April
Stiffened panel S3:
2004
i) Linearly varying load in the
transverse direction
ii) Alternative in-plane boundary
DET NORSKE VERITAS
11
PULS ver. 1.5
supports
version 1.3
and 1.4 data
files, but not
the graphics.
Recalculation
necessary for
updated
graphics and
detailed result
summary