Evaluation of the nonlinear structural response of any structure is a challenging task; a range of input parameters are needed, most of which have significant statistical variability and the evaluations require a high degree of craftsmanship. Hence, high demands are set forth both to the analyst and the body in charge of verification of the results. Recent efforts by DNVGL attempt to mitigate this with the second edition of the DNVGL-RP-C208 for the determination of nonlinear structural response, in which guidance or requirements are given on many of the challenging aspects. This paper discusses the various challenges and the direction to which the RP-C208 points compared to published research. Parameters affecting the plastic hardening, strain-rate effects, and ductile fracture are discussed separately. Then, the combined effect of the range of assumptions is evaluated to assess the resulting level of safety.

References

References
1.
DNVGL,
2016
, “Determination of Structural Capacity by Non-Linear Finite Element Analysis Methods,” DNVGL, Høvik, Norway, Report No.
DNVGL RP-C208
.https://rules.dnvgl.com/docs/pdf/DNV/codes/docs/2013-06/RP-C208.pdf
2.
Storheim
,
M.
, and
Amdahl
,
J.
,
2015
, “
On the Sensitivity to Work Hardening and Strain-Rate Effects in Nonlinear FEM Analysis of Ship Collisions
,”
J. Ships Offshore Struct.
,
12
(
1
), pp.
100
115
.
3.
Standards Norway,
2004
, “Design of Steel Structures,” Standards Norway, Lysaker, Norway, Standard No. N-004.
4.
DNV,
2009
, “Metallic Materials,” DNV, Høvik, Norway, Standard No.
DNV-OS-B101
.https://rules.dnvgl.com/docs/pdf/DNV/codes/docs/2009-04/Os-B101.pdf
5.
Standard Norge,
2000
, “Material Data Sheets for Structural Steel,” Standard Norge, Lysaker, Norway, Standard No.
M-120
.http://www.standard.no/pagefiles/1170/m-120.pdf
6.
BSI,
2008
, “Execution of Steel Structures and Aluminium Structures—Part 2: Technical Requirements for Steel Structures,” Brussels Studies Institute, Brussels, Belgium, Standard No.
EN 1090-2:2008
.https://shop.bsigroup.com/ProductDetail/?pid=000000000030238990
7.
BSI,
2005
, “Eurocode 3: Design of Steel Structures—Part 1–2: General Rules Structural Fire Design,” Brussels Studies Institute, Brussels, Belgium, Standard No.
EN 1993-1-2
.http://www.gaprojekt.com/sites/default/files/legislation/Eurocode%203%20-Design%20of%20steel%20structures%20-%20Part%201-2%20-%20en.1993.1.2.2005.pdf
8.
VanDerHorn
,
E.
, and
Wang
,
G.
,
2012
, “A Statistical Study on the Material Properties of Shipbuilding Steels,” Sustainable Maritime Transportation and Exploitation of Sea Resources, Vol. 1, E. Rizzuto and C. Guedes Soares, eds., CRC Press, Boca Raton, FL, pp.
371
378
.
9.
Billingham
,
J.
,
Sharp
,
J. V.
,
Spurrier
,
J.
, and
Kilgallon
,
P. J.
,
2003
, “Review of the Performance of High Strength Steels Used Offshore,” Health and Safety Executive, Bedfordshire, UK, Research Report No.
105
.http://www.hse.gov.uk/research/rrpdf/rr105.pdf
10.
Willock
,
R. T. S.
,
1992
, “Yield: Tensile Ratio and Safety of High Strength Steels,” Health and Safety Executive, Bedfordshire, UK, Research Report No. 108.
11.
Choung
,
J.
,
Nam
,
W.
, and
Lee
,
J.-Y.
,
2013
, “
Dynamic Hardening Behaviors of Various Marine Structural Steels Considering Dependencies on Strain Rate and Temperature
,”
J. Mar. Struct.
,
32
, pp.
49
67
.
12.
Cerik
,
B. C.
,
2016
, “
A Study on Modelling of Rate-Dependent Material Behaviour in Simulation of Collision Damage
,”
18th International Conference on Computational Geophysics and Sedimentology (ICCGS)
, Ulsan, South Korea, June 15–18, Paper No.
ICCGS 2016-11
.https://www.researchgate.net/publication/304132501_A_study_on_modelling_of_rate-dependent_material_behaviour_in_simulation_of_collision_damage
13.
Storheim
,
M.
,
2016
, “
Structural Response in Ship-Platform and Ship-Ice Collisions
,”
Ph.D. thesis
, Norwegian University of Science and Technology, Trondheim, Norway.https://brage.bibsys.no/xmlui/handle/11250/2375833
14.
Jones
,
N.
,
2006
, “
Some Recent Developments in the Dynamic Inelastic Behavior of Structures
,”
J. Ships Offshore Struct.
,
1
(
1
), pp.
37
44
.
15.
Alves
,
M.
, and
Jones
,
N.
,
1999
, “
Influence of Hydrostatic Stress on Failure of Axisymmetric Notched Specimens
,”
J. Mech. Phys. Solids
,
47
(3), pp.
643
667
.
16.
Storheim
,
M.
,
Amdahl
,
J.
, and
Martens
,
I.
,
2015
, “
On the Accuracy of Fracture Estimation in Collision Analysis of Ship and Offshore Structures
,”
J. Mar. Struct.
,
44
, pp.
254
287
.
17.
Broekhuijsen
,
J.
,
2003
, “Ductile Failure and Energy Absorption of y-Shaped Test Section,” Master's thesis, Delft University of Technology, Delft, The Netherlands.
18.
Simonsen
,
B. C.
, and
Törnqvist
,
R.
,
2004
, “
Experimental and Numerical Modelling of Ductile Crack Propagation in Large-Scale Shell Structures
,”
J. Mar. Struct.
,
17
(
1
), pp.
1
27
.
19.
Alsos
,
H. S.
, and
Amdahl
,
J.
,
2009
, “
On the Resistance to Penetration of Stiffened Plates—Part I: Experiments
,”
Int. J. Impact Eng.
,
36
(
6
), pp.
799
807
.
20.
Tautz
,
I.
,
Schottelndreyer
,
M.
,
Lehmann
,
E.
, and
Fricke
,
W.
,
2013
, “
Collision Tests With Rigid and Deformable Bulbous Bows Driven Against Double Hull Side Structures
,”
Sixth International Conference on Collision and Grounding of Ships and Offshore Structures (ICCGS)
, Trondheim, Norway, June 17–19, pp.
93
100
.
21.
Martens
,
I.
,
2014
, “Konstruktive Aspekte beim Entwurf von Bugwülsten zur Verbesserung des Energieaufnahmevermögens bei Schiffskollisionen,” Ph.D. thesis, Technical University of Hamburg, Hamburg, Germany.
22.
Storheim
,
M.
,
Alsos
,
H. S.
,
Hopperstad
,
O. S.
, and
Amdahl
,
J.
,
2015
, “
A Damage-Based Failure Model for Coarsely Meshed Shell Structures
,”
Int. J. Impact Eng.
,
83
, pp.
59
75
.
23.
Scharrer
,
M.
,
Zhang
,
L.
, and
Egge
,
E. D.
,
2002
, “Kollisions-berechnungen in schiffbaulichen entwurfssystemen (Collision Calculation in Naval Design Systems),” Germanischer Lloyd, Hamburg, Germany, Report No. ESS 2002.183.
24.
DNV,
2010
, “Design Against Accidental Loads,” DNV, Høvik, Norway, Report No.
DNV RP-C204
.http://rules.dnvgl.com/docs/pdf/DNV/codes/docs/2017-08/RP-C204.pdf
25.
DNVGL,
2014
, “Design of Offshore Steel Structures, General (LRFD Method),” DNVGL, Høvik, Norway, Report No.
DNV OS-C101
.https://rules.dnvgl.com/docs/pdf/DNV/codes/docs/2011-04/Os-C101.pdf
You do not currently have access to this content.