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Research Papers: Structures and Safety Reliability

Structural Safety Analyses for Offshore Platforms Under Explosion Loadings

[+] Author and Article Information
Yonghee Ryu

Samsung Heavy Industries Pangyo R&D Center,
Seongnam-si 13486, Gyeonggi-do, South Korea
e-mail: yh32.ryu@samsung.com

Bassam Burgan

The Steel Construction Institute,
Silwood Park,
Ascot SL5 7QN, UK
e-mail: b.burgan@steel-sci.com

Jaewoong Choi

Samsung Heavy Industries Pangyo R&D Center,
Seongnam-si 13486, Gyeonggi-do, South Korea
e-mail: jaewng.choi@samsung.com

Heesung Lee

Samsung Heavy Industries Pangyo R&D Center,
Seongnam-si 13486, Gyeonggi-do, South Korea
e-mail: hs.shi.lee@samsung.com

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received February 26, 2018; final manuscript received October 8, 2018; published online January 17, 2019. Assoc. Editor: Kazuhiro Iijima.

J. Offshore Mech. Arct. Eng 141(4), 041602 (Jan 17, 2019) (9 pages) Paper No: OMAE-18-1017; doi: 10.1115/1.4041718 History: Received February 26, 2018; Revised October 08, 2018

A gas explosion in an offshore platform may result in loss of life, pollution, and critical damage to facilities. Safety critical structural elements of these facilities have to be designed to withstand high explosion loads. The present study discusses methodologies for explosion risk assessment (ERA) of safety critical structural elements and introduces a coupled Eulerian–Lagrangian (CEL) method to improve the accuracy of the dynamic structural response under explosion loading. The design accidental load is defined by explosion risk analyses in terms of drag pressure, differential pressure, and overpressure. In current practice, an explosion pressure-time history is simplified into a triangular shape and uniformly applied to the surface of the impacted structures. This approach cannot account for the interaction between elastic waves (normally solved by the Lagrangian method) in the structure and compression waves (normally solved by the Eulerian method) in air. The CEL method which accounts for fluid–structure interaction has been experimentally validated and leads to more realistic predictions of the dynamic response of structures when compared to other analysis methods. The plastic strains derived from the CEL analysis can be approximately 50% lower than those predicted by Lagrangian analysis. Therefore, significant potential weight reduction can be achieved using the CEL method for gas explosion analysis.

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Figures

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Fig. 1

Process of gas ERA and management (Adapted from Paik et al. [12])

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Fig. 2

Distributed monitoring points and panels

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Fig. 3

Monitor points to record differential overpressure

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Fig. 4

Calculation method for differential overpressure: (a) direct load measurement method and (b) idealized assumption method

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Fig. 5

Different blast load profile: (a) type I, (b) type II, and (c) type III

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Fig. 6

Process of structural analyses

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Fig. 7

Triangular shape force

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Fig. 8

Dynamic response of linear SDOF systems

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Fig. 9

Dynamic response of nonlinear SDOF systems

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Fig. 10

Stress distributions by NTA

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Fig. 11

One-dimensional Eulerian model

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Fig. 12

Two-dimensional Eulerian model

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Fig. 13

Comparison of the reflected pressure profile

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Fig. 14

Three-dimensional Eulerian model

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Fig. 15

Mesh generation for 3D CEL analysis

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Fig. 16

Pressure distributions by 3D CEL analysis

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Fig. 17

Comparison of displacements at Gtop

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Fig. 18

Equivalent plastic strain distribution at the peak displacement: (a) Lagrangian and (b) CEL

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