Performance of offshore concrete platforms subjected to internal explosion after gas leak

Author:

Prakhya Ganga K. V.1,Karthigeyan Vaithilingam2

Affiliation:

1. Head of Design Group, Sir Robert McAlpine Ltd, Hemel Hempstead, UK (corresponding author: )

2. Retired Structural Engineering Specialist, Offshore Safety Division, Health & Safety Executive, Merseyside, UK

Abstract

The paper describes the assessment of existing concrete structures that support large oil platforms in the North Sea when subjected to internal explosion loads. Internal explosion loads are the result of a gas leak from the pipes inside of a hollow concrete column (shafts) supporting large concrete gravity-based oil platforms. Explosion at base, mid-height and close to the deck support of the column were studied following a gas leak at different zones of pipe networks in the shafts. Explosion models generated pressure–time curves for predicting the structural response. The structural response of the shaft during an explosion is dependent on the interaction of fluid and structure. Explosion models generated dynamic pressure–time history loading to be used in structural safety assessments. Transient dynamic analysis was carried out to assess the structural response and strength assessment was carried out using design codes. As the original designs in the past for most of the existing offshore installations did not include the ‘gas leak’ scenario, the study suggested that a suitable risk assessment for existing installations carrying utilities in the column is carried out to ensure that the structural stability is not compromised.

Publisher

Thomas Telford Ltd.

Subject

Building and Construction,Civil and Structural Engineering

Reference36 articles.

1. Gas explosion handbook

2. British Gas Research and Technology (1992) The Prediction of the Pressure Loading on Structures Resulting from an Explosion. Offshore Technology Report. Health and Safety Executive Offshorte Technology Information, London, UK, report OTI 92 594.

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1. Editorial;Proceedings of the Institution of Civil Engineers - Structures and Buildings;2021-04

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