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.

中文翻译：

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气体泄漏后遭受内部爆炸的海上混凝土平台的性能

本文描述了在遭受内部爆炸载荷时，对支撑北海大型石油平台的现有混凝土结构的评估。内部爆炸载荷是从空心混凝土柱（竖井）内部的管道泄漏气体的结果，空心混凝土柱支撑着大型的混凝土重力式油平台。在竖井的管网不同区域发生气体泄漏后，研究了塔基，中高和靠近甲板支撑处的爆炸。爆炸模型生成压力-时间曲线，以预测结构响应。爆炸期间井筒的结构响应取决于流体和结构的相互作用。爆炸模型产生动压力-时程荷载，用于结构安全评估。进行了瞬态动力分析以评估结构响应，并使用设计规范进行了强度评估。由于过去大多数现有海上设施的原始设计都不包括“天然气泄漏”的情况，因此该研究建议对在塔中装有公用设施的现有设施进行适当的风险评估，以确保结构稳定性不妥协。