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API REPORT 79-22 Document Information:
Title
Applicability of Reliability Analysis in Offshore Design Practice
American Petroleum Institute
Publication Date:
Jun 1, 1980
Scope:
1.6 Report Scope
The proposed LRFD format is summarized in Chapter Two; a hypothetical
list of partial factors is provided in Table 2.1 for illustration.
Chapter Three gives more detail on the LRFD format and especially the
safety index method for
incorporating uncertainties. Illustrative examples for simple elements
and interaction checks (beam--columns) are presented. The various
methods of calibration are also examined. Advantages of an LRFD format
to achieve more uniform safety index (B) are described by comparing the
current AISC-API, the DnV and the proposed LRFD models.
The relationship of the proposed format to both DnV 1977 and the new
AISC-LRFD is described in Chapter Four. A review of RP2A outlining in
detail the sections requiring modification for an LRFD format is given
in Chapter Five. The industry questionnaire and the responses are given
in Chapter Six.
Chapter Seven describes several research areas that need investigation
to support and/or allow for the incorporation of an LRFD format.
Chapter Seven is divided into two categories: 1) a set of problems
which must be solved before LRFD can be introduced in platform
design, 2) items requiring research to improve an RP2A-LRFD format by
contributing more data for uniform and balanced reliability.
Chapter Eight describes in detail a proposed implementation schedule
for introducing LRFD into RP2A. A multiyear timetable is given, along
with a definition of tasks. Chapter Nine concludes with a brief
overview of this study.
Technical materials, as well basic reliability background, are given in
the Appendices. Appendix A has a glossary of reliability
terminology, while Appendix B presents some technical derivations,
including a brief description of advanced reliability methods developed
in Europe. Appendices C--G describe foundation considerations,
counteracting loads, system reliability, analysis uncertainty, lifetime
risks and deck design, respectively. These are areas that were given
attention in this project because they contained unique aspects of
platform design within the general context of structural reliability
application. Appendix H presents the questionnaire as well as some more
detailed responses.
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