1、Seismic Design Procedures and Criteria for Offshore StructuresANSI/API RECOMMENDED PRACTICE 2EQFIRST EDITION, NOVEMBER 2014ISO 19901-2:2004 (Modified), Petroleum and natural gas industriesSpecific requirements for offshore structuresPart 2: Seismic design procedures and criteriaSpecial NotesAPI publ
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17、ments of the referenced standard.Suggested revisions are invited and should be submitted to the Standards Department, API, 1220 L Street, NW,Washington, DC 20005, standardsapi.org.This standard is under the jurisdiction of the API Subcommittee on Offshore Structures. This is standard modifiedfrom th
18、e English version of ISO 19901-2:2004. ISO 19901-2 was prepared by Technical Committee ISO/TC 67,Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries, SubcommitteeSC 7, Offshore structures.iiiContentsPage1 Scope . . . . . . . . . . . . . . . . . . . .
19、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Normative References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Terms and De
20、finitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Symbols and Abbreviated Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
21、.1 Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54.2 Abbreviated Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22、. . . . . . . . . . . . . . . . . . 65 Earthquake Hazards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Seismic Design Principles and Methodology . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23、 . . . . . . . . . . . . . . . . . . . . 76.1 Design Principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76.2 Seismic Design Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76.3 Spectral Acceleration Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106.4 Seismic Risk Category . . . . . . . . . . . . . . . . . . . . . . . .
25、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116.5 Seismic Design Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 Simplified Seismic Action Procedure . . . . . . . . .
26、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127.1 Soil Classification and Spectral Shape. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127.2 Seismic Action Procedure . . . . . . . . . . . . .
27、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168 Detailed Seismic Action Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178.1 Site-specific Seismic Hazard Assessment.
28、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178.2 Probabilistic Seismic Hazard Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178.3 Deterministic Seismic Hazard Analysis . .
29、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178.4 Seismic Action Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198.5 Local Site Response Analyses . .
30、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209 Performance Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229.1 ELE Performance. . . .
31、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229.2 ALE Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32、 22Annex A (informative) Additional Information and Guidance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Annex B (informative) Regional Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Ann
33、ex C (informative) Identification and Explanation of Deviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
34、 . . . . 52Figures1 Seismic Design Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 Seismic Acceleration Spectrum for 5 % Damping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
35、 . . . . . 153 Probabilistic Seismic Hazard Analysis Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184 Typical Seismic Hazard Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36、. . . 21B.1 5 % Damped Spectral Response Accelerations for Offshore Africa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33B.2 5 % Damped Spectral Response Accelerations for Offshore North America . . . . . . . . . . . . . . . . . . . . . . 35B.3 5 % Damped Spectral Response Accelerati
37、ons for Offshore Central America . . . . . . . . . . . . . . . . . . . . . 36B.4 5 % Damped Spectral Response Accelerations for Offshore South America . . . . . . . . . . . . . . . . . . . . . . 37B.5 5 % Damped Spectral Response Accelerations for Offshore Australia and New Zealand. . . . . . . . .
38、. . . 39vContentsPageB.6 5 % Damped Spectral Response Accelerations for Offshore East Asia. . . . . . . . . . . . . . . . . . . . . . . . . . . 40B.7 5 % Damped Spectral Response Accelerations for Offshore South Asia . . . . . . . . . . . . . . . . . . . . . . . . . 42B.8 5 % Damped Spectral Respons
39、e Accelerations for Offshore Europe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44B.9 5 % Damped Spectral Response Accelerations for Offshore Indonesia . . . . . . . . . . . . . . . . . . . . . . . . . . 45B.10 5 % Damped Spectral Response Accelerations for Offshore Japan. . . . . . . .
40、 . . . . . . . . . . . . . . . . . . . . . . 46B.11 5 % Damped Spectral Response Accelerations for Offshore Middle East. . . . . . . . . . . . . . . . . . . . . . . . . 48Tables1 Site Seismic Zone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
41、 . . . . . . . . . . . . . . . . . . . 112 Target Annual Probability of Failure, Pf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 Seismic Risk Category, SRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
42、. . . . . . . . . . . . . . . . . . . . . . . 114 Seismic Design Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 Determination of Site Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
43、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 Values of Cafor Shallow Foundations and 0.2 s Period Spectral Acceleration. . . . . . . . . . . . . . . . . . . . . 147 Values of Cvfor Shallow Foundations and 1.0 s Period Spectral Acceleration . . . . . . . . . . . . . . . . . . . . . 14
44、8 Values of Caand Cvfor Deep Pile Foundations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149 Scale Factors for ALE Spectra. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1610
45、CrFactors for Steel Jacket of Fixed Offshore Platforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1611 Correction Factor, Cc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
46、12 Minimum ELE Return Periods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20A.1 Correction Factor Ccfor ALE Spectral Acceleration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31A.2 C
47、orrection Factor on Pf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31viForeword Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.ISO shall not
48、be held responsible for identifying any or all such patent rights.ISO 19901-2 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures forpetroleum, petrochemical and natural gas industries, Subcommittee 7, Offshore structures.ISO 19901 consists of the following pa
49、rts, under the general title Petroleum and natural gas industriesSpecificrequirements for offshore structures: Part 1: Metocean design and operating considerations, Part 2: Seismic design procedures and criteria, Part 3: Topsides structure, Part 4: Geotechnical and foundation design considerations, Part 5: Weight control during engineering and construction, Part 6: Marine operations, Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units.ISO 19901 is one of a series of standards for offshore structures. The full series consists of the follo
