ISO 19901-2:2017 石油和天然气工业 离岸海面建筑特殊要求 第2部分：抗地震设计程序和标准

标准编号：ISO 19901-2:2017

中文名称：石油和天然气工业 离岸海面建筑特殊要求 第2部分：抗地震设计程序和标准

英文名称：Petroleum and natural gas industries — Specific requirements for offshore structures — Part 2: Seismic design procedures and criteria

发布日期：2017-11

标准范围

ISO 19901-2:2017包含定义海洋结构物抗震设计程序和标准的要求；附录A中包含了有关要求的指南。这些要求侧重于固定式钢制海洋结构物和固定式混凝土海洋结构物。简要讨论了地震事件对浮式结构物和部分浮式结构物的影响。ISO 19901-2:2017仅在适用要求的范围内涵盖了高架条件下自升式平台的现场特定评估。仅详细讨论了地震引起的地面运动。文中还提到并简要讨论了液化、边坡失稳、断层、海啸、泥火山和冲击波等其他地质诱发灾害。这些要求旨在将人员、环境和资产的风险降至合理可行的最低水平。这一目的通过以下方式实现:a） 地震设计程序取决于海洋结构物的暴露水平和地震事件的预期强度；b） 一种两级抗震设计检查，其中结构的强度和刚度设计为极限状态（ULS），然后根据异常环境事件或异常极限状态（ALS）进行检查，以确保其满足储备强度和能量耗散要求。针对高地震区和/或高暴露水平的海洋结构物，提出了现场特定概率地震危险性分析（PSHA）的程序和要求。然而，不包括对PSHA程序的全面解释。在允许采用简化设计方法的情况下，附件B中包含的全球近海地图显示了与1000年重现期对应的地面震动强度。在这种情况下，这些地图可与相应的比例系数一起使用，以确定结构设计的适当地震作用。对于固定式钢质海洋结构物的设计，ISO 19902中包含了设计参数（例如部分作用和阻力系数）的进一步具体要求和建议值，而固定式混凝土海洋结构物的要求和建议值则包含在ISO 19903中。浮式结构的抗震要求包含在ISO 19904中，适用于现场-ISO 19905（所有部分）中自升式平台和其他MOU的具体评估，ISO 19906中北极结构和ISO 19901？3中上部结构的具体评估。

ISO 19901-2:2017 contains requirements for defining the seismic design procedures and criteria for offshore structures; guidance on the requirements is included in Annex A. The requirements focus on fixed steel offshore structures and fixed concrete offshore structures. The effects of seismic events on floating structures and partially buoyant structures are briefly discussed. The site-specific assessment of jack-ups in elevated condition is only covered in ISO 19901-2:2017 to the extent that the requirements are applicable.Only earthquake-induced ground motions are addressed in detail. Other geologically induced hazards such as liquefaction, slope instability, faults, tsunamis, mud volcanoes and shock waves are mentioned and briefly discussed.The requirements are intended to reduce risks to persons, the environment, and assets to the lowest levels that are reasonably practicable. This intent is achieved by using:a) seismic design procedures which are dependent on the exposure level of the offshore structure and the expected intensity of seismic events;b) a two-level seismic design check in which the structure is designed to the ultimate limit state (ULS) for strength and stiffness and then checked to abnormal environmental events or the abnormal limit state (ALS) to ensure that it meets reserve strength and energy dissipation requirements.Procedures and requirements for a site-specific probabilistic seismic hazard analysis (PSHA) are addressed for offshore structures in high seismic areas and/or with high exposure levels. However, a thorough explanation of PSHA procedures is not included.Where a simplified design approach is allowed, worldwide offshore maps, which are included in Annex B, show the intensity of ground shaking corresponding to a return period of 1 000 years. In such cases, these maps may be used with corresponding scale factors to determine appropriate seismic actions for the design of a structure.For design of fixed steel offshore structures, further specific requirements and recommended values of design parameters (e.g. partial action and resistance factors) are included in ISO 19902, while those for fixed concrete offshore structures are contained in ISO 19903. Seismic requirements for floating structures are contained in ISO 19904, for site-specific assessment of jack-ups and other MOUs in ISO 19905 (all parts), for arctic structures in ISO 19906 and for topsides structures in ISO 19901？3.

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