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research-article

Structural Safety Analyses for Offshore Platforms under Explosion Loadings

[+] Author and Article Information
Yonghee Ryu

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

Bassam Burgan

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

Jaewoong Choi

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

Hee Sung Lee

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

1Corresponding author.

ASME doi:10.1115/1.4041718 History: Received February 26, 2018; Revised October 08, 2018

Abstract

A gas explosion in an offshore platform may result in loss of life, environmental impact, and critical damage to the facilities. In case of a strong explosion, certain safety critical structural elements of these facilities have to be designed to withstand high explosion loads. The present study discusses novel methodologies in explosion risk assessment for the safety critical structural elements and introduces a coupled Eulerian-Lagrangian (CEL) method to improve the accuracy of the dynamic structural response under the explosion loading. The design accidental load is defined by explosion risk analyses in terms of drag pressure, differential pressure, and overpressure. In the existing methods, an explosion pressure-time history is commonly simplified as a triangular shape and uniformly applied to the surface of structures. As a result, these methods 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 medium. The proposed CEL method, which is experimentally validated, leads to realistic predictions of dynamic response of structures compared to the existing methods. The plastic strains derived from the CEL analysis can be approximately 50% lower than the results of Lagrangian analysis. Therefore, significant potential weight reduction can be achieved using the CEL method for a gas explosion analysis.

Copyright (c) 2018 by ASME
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