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Structural Code Check

Regulatory authorities, such as American Petroleum Institute, make recommendations for platforms offshore. They establish in particular rules (code checks) that structures subjected to loads have to verify. These rules consist in calculating ratios between effective and allowable stresses and verifying that these remain included between 0 and 1.

There are a lot of Code Checks depending on the type of the structural elements checked and on the regulatory agencies (American Petroleum Institute, Det Norske Veritas, European Standard ). DeepLines implements some of these code checks: the list is shown in the table below.

The structural elements that can be checked are:

• Tubular member (Circular Hollow Section).
• Tubular intersections (Circular Hollow Section) also called joints CHS.
• Rectangular hollow shell with stiffener and girder.
• (Un)stiffened cylindrical hollow shells.
• Unstiffened conical hollow shells.

The available code checks are named in DeepLines like in the first column of the table below (see the Study tab of a structural code check study dialog box). The second indicates the type of the structural components on which they can be applied. The last column shows the reference of the regulation published by the agency of regulations.

Name	Element type	Reference
API-RP-2A-WSD-2007	Tube Joint CHS	American Petroleum Institute Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms—Working Stress Design, Chapters 3 and 4 API RP 2A-WSD 21th edition., errata and supplement 3, October 2007
API-RP-2A-LRFD-1993	Tube Joint CHS	American Petroleum Institute Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms—Load and Resistance Factor Design, Commentaries D and E API RP 2A-LRFD 1st edition, July 1, 1993. Reaffirmed, May 16, 2003
ISO-19902-2007	Tube Joint CHS	International Organization for Standardization Petroleum and natural gas industries —Fixed steel offshore structures, sections 13 and 14 ISO 19902:2007, 1st edition, December 2007
NORSOK-N-004-2004	Tube Joint CHS	Standards Norway Design of Steel Structures, sections 6.3 and 6.4 NORSOK standard, N-004, Rev. 2, October 2004
NORSOK-N-004-2013	Tube Joint CHS	Standards Norway Design of Steel Structures, sections 6.3 and 6.4 NORSOK standard, N-004, Rev. 3, February 2013
DNVGL-ST-0126-2021	Tube Joint CHS	DNV.GL Support structures for wind turbine, section 4.5.1.5 DNV-ST-0126, December 2021 (NORSOK-N-004-2013 with material factor given in section 4.5.1.5)
DNV-RP-C202-2010	Stiffened ou unstiffened cylindrical hollow shell	Det Norske Veritas Buckling strength of shells DNV-RP-C202, October 2010
DNVGL-ST-0126-2021	Stiffened ou unstiffened cylindrical hollow shell	DNV.GL Support structures for wind turbine, section 4.4.1.6 DNV-ST-0126, December 2021 (DNV-RP-C202-2010 with material factor given in section 4.4.1.6)
DNV-RP-C202-2010-Cone	Unstiffened conical hollow shell	Det Norske Veritas Buckling strength of shells, 4. Unstiffened Conical shells DNV-RP-C202, October 2010
DNVGL-ST-0126-2021-Cone	Unstiffened conical hollow shell	DNV.GL Support structures for wind turbine, section 4.4.1.6 DNV-ST-0126, December 2021 (DNV-RP-C202-2010-Cone with material factor given in section 4.4.1.6)
EN-1993-1-6-2007	Unstiffened cylindrical hollow shell with several thicknesses	European standard Eurocode 3 - Design of steel structures - Part 1-6, section D.2 EN 1993-1-1, February 200
DNV-RP-C201-2010	Rectangular hollow shell with stiffener and girder	Det Norske Veritas Buckling strength of plated structures DNV-RP-C201, October 2010
DNV-CN-30-1-1995	Rectangular hollow shell with stiffener and girder	Det Norske Veritas Buckling strength analysis, sections 2.2 and 2.3 Classification notes 30.1, July 1995
EN-1993-1-1-2005	Rectangular hollow shell with stiffener and girder	European standard Eurocode 3: Design of steel structures - Part 1-1, section 6.2.1 EN 1993-1-1, May 2005
DNV-ST-0119-2018	Rectangular hollow shell with stiffener and girder	DNV GL Floating wind turbine structures, Sections 7.1.6 and 7.1.7 DNVGL-ST-0119, July 2018