API REPORT 80-22 Guidelines for Calibrating API RP2A for Reliability-Based Design
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API REPORT 80-22 Document Information:
Title
Guidelines for Calibrating API RP2A for Reliability-Based Design
American Petroleum Institute
Publication Date:
Oct 1, 1981
Scope:
1.5 Report Scope
Chapter Two presents the initial LRFD-RP2A document with nominal
checking formulas and load and resistance factors. It is intended to
be used with the current RP2A for nominal values of load, soil and
tubular member strength and needed information on detailing,
fabrication and installation. Chapter Two and the current RP2A should
be sufficient for checking the test platform during the 1981 project.
Chapter Three provides the background on the material in the LRFD RP2A
including explanations for the nominal checking formulas where they
differ from present RP2A. The derivation of the partial load and
resistance factors is described in detail. Chapter 4 contains a
summary of the platform member survey which provided a sample of
braces, legs and piles from twelve platforms. These data provided the
reference range of member properties for the LRFD calibration.
The sensitivity of the safety indices with respect to variations in a
plausible data base is examined in detail in Chapter Five. A
discussion of the implications of LRFD for foundation analysis and its
possible impact on nonlinear response analysis is given in Chapter
Six.
Chapter Seven outlines future work especially the test case platform
check for the 1981 project. Areas requiring further investigation and
a review of possible sources of additional information are also given.
Chapter Eight provides some conclusions for this project.
The beam-column safety index analysis that was utilized has been
described in Appendix A because of the detail required. Several
examples are provided for illustration. The paper prepared for the API
Annual Meeting is given in Appendix B. It can serve as an introduction
to reliability design and a justification for its pursuit for platform
application. It was especially intended for managers and others not
necessarily involved in detailed structural design procedures.
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