Posted by: poolmand - 09-04-2021, 09:24 AM - Forum: ISO
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The ISO 19901-2:2017 :
Petroleum and natural gas industries
Specific requirements for offshore structures
Part 2: Seismic design procedures and criteria
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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Can you please share the following ASCE conference paper:
Title: Shaft Resistance of Rock- Socketed Drilled Piers,
Authors: Horvath, R. G., and T. C. Kenney,
Publisher: ASCE Conference Paper,
Date: Atlanta, October 23–25, 1979
Structures require a complete load path to maintain stability. Load paths connect each point of load application to a point of resistance. In seismic design, every element with mass is considered a point of application and the foundation is considered the point of resistance. This presentation focuses on seismic load path and the role of diaphragms and their components, including chords, collectors, and collector connections. Foundation issues are discussed and the concept of deformation compatibility of the entire structure is presented.
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This presentation addresses the derivation of design forces for braced-frame beams and their connections for various loading conditions including wind and seismic loads. In particular, the presentation focuses on the combination of frame-design and diaphragm-design forces. The presentation gives a methodology for determining consistent sets of design forces based on increasing levels of complexity. Emphasis will be placed on clear free body diagrams and consistent sets of forces corresponding to clear and understandable load conditions for the frame.
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Dear All,
The latest DNVGL-RP-C210:2019 Edition-Probabilistic methods for planning of inspection for fatigue in offshore structures was released in September 2019 and DNV-RP-B401:2021 Edition Cathodic protection design Cathodic protection design was released in May 2021
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The IEC 61400-3:2019 was released in 2019. Please share with us if you have this.
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Posted by: poolmand - 08-30-2021, 09:28 AM - Forum: ACI
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ACI MATERIALS JOURNAL
Size: 5.9 MB | Format:PDF | Quality:Original preprint | Publisher: American Concrete Institute | Year: JULY 2021 | pages: 146
This peer-reviewed journal continues the publishing tradition the Institute started in 1904. Information published in ACI Materials Journal includes: properties of materials used in concrete; research on materials and concrete; properties, use, and handling of concrete.
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The ISO 19901-2:2017 was released in 2017. Please share with us if you have this.
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ANSI/API RECOMMENDED PRACTICE 2EQ FIRST EDITION, NOVEMBER 2014 (2021) Seismic Design Procedures and Criteria for Offshore Structures
Author(s)/Editor(s): API | Size: 7.25 MB | Format:PDF | Quality:Unspecified | Publisher: API | Year: 2014 | pages: 104
ANSI/API RECOMMENDED PRACTICE 2EQ
FIRST EDITION, NOVEMBER 2014
ADDENDUM 1, JANUARY 2019
REAFFIRMED, JANUARY 2021
ISO 19901-2:2004 (Modified), Petroleum and natural gas industries—Specific requirements for offshore structures—Part 2: Seismic design procedures and criteria
This standard contains requirements for defining the seismic design procedures and criteria for offshore structures and is a modified adoption of ISO 19901-2. The intent of the modification is to map the requirements of ISO 19901-2 to the United States’ offshore continental shelf (U.S. OCS). The requirements are applicable to fixed steel structures and fixed concrete structures. The effects of seismic events on floating structures and partially buoyant structures are also briefly discussed. The site-specific assessment of jack-ups in elevated condition is only covered to the extent that the requirements are applicable.
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