Offshore installations are designed to withstand against potential collisions from offshore supply vessels (OSV). Quantitative risk assessment (QRA) provides an overall picture of expected collision frequencies and consequences for the design life of a platform and subsequently estimates the damage repair cost. However, the main challenge of the QRA study is how well various uncertainties are implemented into the model. This study aimed to introduce and demonstrate an advanced and efficient QRA model for the collision between an OSV and a jacket type offshore platform. A set of fifty collision scenarios were selected using probabilistic sampling techniques, and vessel motion analyses were performed to determine collision load characteristics. Extensive nonlinear structural crashworthiness analyses were conducted using advanced computational modelling techniques, and the repair cost of the damaged brace and column members were calculated. Probability exceedance diagrams were established for different consequence parameters, and asset risks were calculated. A comparison study of the design values of damage parameters and repair costs were carried out in association with the NORSOK and HSE risk acceptance criteria. A sensitivity study was carried out to study the effects of various collision load parameters on the structural consequences. The methods and insights developed in this study could be applied to both new and existing offshore platforms and practically useful for the platform owners to aid in their decision-making process towards the risk-based safety analysis of offshore platforms.

海上设施的设计旨在抵御来自海上补给船（OSV）的潜在碰撞。定量风险评估（QRA）提供了预期的碰撞频率和对平台设计寿命的影响的总体情况，并随后估算了损害修复的成本。但是，QRA研究的主要挑战是如何将各种不确定性实施到模型中。这项研究旨在介绍和演示先进有效的QRA模型，用于OSV与外套式海上平台之间的碰撞。使用概率采样技术选择了五十种碰撞场景，并进行了船舶运动分析以确定碰撞载荷特征。使用先进的计算建模技术进行了广泛的非线性结构耐撞性分析，并计算了损坏的支撑和柱构件的维修成本。针对不同的后果参数建立了概率超标图，并计算了资产风险。结合NORSOK和HSE风险接受标准对损伤参数和维修成本的设计值进行了比较研究。进行了敏感性研究，以研究各种碰撞载荷参数对结构后果的影响。