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Preliminary assessment of the design requirement against blast load for ship superstructure

Liu, L; Tan, PJ; Yuan, Y; Wrobel, P; (2020) Preliminary assessment of the design requirement against blast load for ship superstructure. Ships and Offshore Structures , 15 (5) pp. 550-573. 10.1080/17445302.2019.1661628. Green open access

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Abstract

This paper attempts to rationalise, and assess, the existing design requirement for the sizing of the outer plating of a ship superstructure against an external air blast. First, a review of the current design guideline, specifically on how the blast load parameters were specified by the Rules and Regulations of Lloyd's Register and the assumptions behind the use of the scantling equation, is provided by the way of a design case study. Next, a non-linear SDOF model that incorporates a new plastic membrane phase is developed in this paper, together with three-dimensional FE simulations, to model the large inelastic deformation of the platings. The required plate thickness needed to resist a specified load intensity is then compared for the three different methods, viz. Lloyd's Register design rule, SDOF and FE. As expected, it will be shown that existing design guideline achieves the purpose of maintaining water or gas-tight integrity of a plating; however, there exists significant unnecessary redundancies (or over design) with implications on light-weighting. Additionally, the results will be summarised in the form of a failure map that will be useful to designers.

Type: Article
Title: Preliminary assessment of the design requirement against blast load for ship superstructure
Open access status: An open access version is available from UCL Discovery
DOI: 10.1080/17445302.2019.1661628
Publisher version: https://doi.org/10.1080/17445302.2019.1661628
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Navy ship superstructure outer plating, external blast, rules and regulations, single degree of freedom (SDOF), finite elements modelling (FE)
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10075337
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