Platework

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Abbreviations

Version: All

Definitions of abbreviations in Platework

Mbend1 =  Beam bending moment at end 1 Mbmid  =  Beam bending moment at midspan Mbend2 =  Beam bending moment at end 2

CMend1 = Correction bending moment at end 1 CMmid  = Correction bending moment at                                    midspan CMend2 = Correction bending moment at end 2

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What plate code checks are available and what are the differences between them? (GeniE/Platework/Nauticus Hull/PULS)

Plate buckling analysis and code checks are available in both GeniE, Nauticus Hull, PULS and Platework as described herein.

Sesam GeniE is used for FE analysis of offshore structures (Sesam) and ships (Nauticus Hull).

Plate code checks according to the following ship rule sets are integrated in GeniE:

  • DNV1A ship and Offshore rules
  • CSR BC&OT
  • CSR Bulk
  • CSR Tank

DNV 1A ship rules and CSR BC&OT (harmonized) came into force 2015/2016, replacing DNV 1A1, CSR Bulk and CSR Tank rules. DNV Offshore rules came into force January 2019. Tutorials for cargo hold analysis and code checks according to CSR BC&OT and DNV Offshore are available in the customer portal, search for cargo hold analysis. For tutorial according to DNV 1A ship rules rules, please contact software support.

PULS (Panel Ultimate Limit State) is a plate buckling analysis code used in CSR Tank and DNV-RP-C201 Part 2 (offshore). PULS integrated in GeniE can be used for offshore structures to check longitudinal structure according to DNV-RP-C201 Part 2 and some transverse structure according to DNV 1A1 ship class. This should be discussed with offshore class prior to usage. In this case some defaults in the CSR Tank plate code check in GeniE must be modified. More information is found in the Sesam training course SE-23 FPSO global strength and spectral fatigue analysis.

Furthermore, PULS is available in Nauticus Hull (ship structures) in three other ways:

  • PULS Excel standalone spreadsheet, effective for parameter studies
  • PULS AV (Advanced viewer) standalone program offering functionality for better understanding and optimization wrt buckling capacity of the plated structure
  • PULS in classic Nauticus Hull up to Jan 2018 (v18.15) Section Scantlings for hull girder capacity in the ULS check according to Offshore Standard DNVGL-OS-C102 (Ch.2 Sec.4.3).

See also separate FAQ "The four variants of PULS" about how these variants are licensed and installed.

Platework is focused towards the offshore industry and supports rules and regulations from the following authorities: API, DNV and NPD, covering the following types of checks: Plate yield and buckling checks, stiffener yield and buckling checks, girder yield and buckling checks. The methodology in Platework is based on DNV-RP-C201 Part 1. The last update to the code (major revision) was made in 2004 and the user interface has not been updated since the mid-90s.

Platework references

DNV: DNV Recommended Practice C201, 2004.

API: Bulletin on Design of Flat Plate Structures, API Bulletin 2V (BUL 2V), First Edition, May 1, 1987.

Recommended Practice for Planning, Designing and Constructing Tension Leg Platforms, API Recommended Practice 2T (RP 2T), First Edition, April 1, 1987.

NPD: Regulations for structural design of load-bearing structures intended for exploration of petroleum resources, Norwegian Petroleum Directorate, 1984. Guidelines for design of steel structures, Norwegian Petroleum Directorate, 1989.

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