By American Petroleum Institute

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Additional resources for API RP 2A- WSD Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms—Working Stress Design

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3 except that the allowable punching shear stress in the chord wall, vpa and the allowable joint capacities, Pa and Ma, may be increased by 70 percent in lieu of a 1/3 increase. 6-1) Where fAX, fIPB, and fOPB are stresses in the chord due to twice the strength level seismic loads in combination with gravity, hydrostatic pressure and buoyancy loads or to the full capacity of the chord away from the joint can, whichever is less. 2. Deck Appurtenances and Equipment. Equipment, piping, and other deck appurtenances should be supported so that induced seismic forces can be resisted and induced displacements can be restrained such that no damage to the equipment, piping, appurtenances, and supporting structure occurs.

Open Shelf” Range S Range X, ft. “Open Shelf” Range Quality 1. Gulf of Mexico (N of 27°N & W of 86°W) 2. Gulf of Mexico (E of 86°W) 2 (1–3) 70 (60–80) 1/ – 1/ 11 15 3 (2–5) 2 3. Southern California (Santa Barbara & San Pedro Ch) 2 (1–3) 45 (35–55) 1/ – 1/ 11 30 6 (5–7) 1 4. California Bank 2 (1–3) 60 (50–65) 1/ – 1/ 13 25 5 (4–6) 2 5. Central California 2 (1–3) 60 (50–70) 1/ – 1/ 13 25 7 (6–8) 2 6. Washington/Oregon 2 (1–4) 85 (70–100) 1/ – 1/ 13 19 8 (7–10) 3 7. Gulf of Alaska (Icy Bay) 3 (2–4) 100 (90–120) 1/ – 1/ 13 17 11 (10–13) 2 8.

D Ductility Requirements 1. The intent of these requirements is to ensure that platforms to be located in seismically active areas have adequate reserve capacity to prevent collapse under a rare, intense earthquake. Provisions are recommended herein which, when implemented in the strength design of certain platforms, will not require an explicit analytical demonstration of adequate ductility. These structure-foundation systems are similar to those for which adequate ductility has already been demonstrated analytically in seismically active regions where the intensity ratio of the rare, intense earthquake ground motions to strength level earthquake ground motions is 2 or less.

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