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The most advanced method, reserved for high-consequence structures in extreme seismic zones. It simulates the platform’s step-by-step physical response to actual recorded earthquake time-histories. 5. How to Access the Legitimate Document
: It is a modified adoption of ISO 19901-2 , specifically tailored for the United States Offshore Continental Shelf (U.S. OCS).
Regulatory bodies (e.g., BSEE in the USA) often mandate compliance with the latest API standards.
) to establish the expected reserve strength and ductility of a platform. Crcap C sub r
The standard replaces older seismic design sections previously nested inside API RP 2A-WSD. It introduces a modern, risk-based methodology split into two core design earthquakes: 1. Extreme Environmental Event (EEE)
Time-domain and frequency-domain analysis for mooring performance.
This is the primary design phase. The structure is engineered for strength and stiffness to survive a less severe, but more probable, seismic event known as the Extreme Level Earthquake (ELE) . The goal under the ELE is to ensure the structure remains essentially elastic, with no significant damage that would impair its primary load-bearing functions. This event is consistent with, though not identical to, the old "Strength Level Earthquake (SLE)" concept from earlier API guidance.
The standard's overarching goal is to reduce risks "to persons, the environment, and assets to the lowest levels that are reasonably practicable". This risk-based approach is operationalized by its two-tiered design checks, which consider both the platform's (the consequences of failure) and the expected intensity of seismic events at its location.
The updated standard revises the allowable stress levels and safety factors for mooring components, ensuring a more uniform level of safety across different types of floating structures. 4. Integration with Modern Software
: Focused on structural strength and stiffness during moderate seismic events.
