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API REPORT 119 Document Information:
Title
Ground Motion Intensity Factors and Acceleration Response Spectra Ninth Edition API RP 2A Earthquake Design Provisions Eastern Gulf of Alaska Region
American Petroleum Institute
Publication Date:
Nov 1, 1978
Scope:
PERSPECTIVE
This report documents a study of earthquake design criteria for the
eastern Gulf of Alaska. This
study backgrounded a portion of the development of the Ninth Edition
of API RP 2A's Section 2.10
earthquake design guideline effective ground acceleration and response
spectra.
This study was performed during 1976 and 1977, with additional details
developed during early 1978.
This study is based on a statistical and probabilistic platform system
performance analysis (risk
or reliability analysis). In this analysis, an assessment was made of
environmental exposures
(oceanographic and seismic), the loadings imposed or induced in a
given type of platform system,
and the ability of the platform system (designed for given amounts of
loading and according to API
element sizing criteria) to resist such loadings. Environmental
criteria parameters were determined
from an assessment of reliabilities (for different design strategies)
and cost impacts.
A conventional drilling and production, steel, tubular membered, pile
supported, 12-leg,
template-type platform for 300 feet of water, sited on soft and stiff
soil profiles was used to
characterize the platform system. Environmental conditions for the
eastern Gulf of Alaska were
studied. Elements of the platform (legs, braces, joints, piles) were
sized according to the element
sizing criteria contained in the Ninth Edition of RP 2A.
The results of this study are contained in two primary elements of the
Ninth Edition RP 2A
earthquake guidelines:
• Seismic zoning of the eastern Gulf of Alaska offshore area
(Zone 5), and the associated
effective ground acceleration (0.4 g), and
• Elastic response spectra appropriate for different soil
conditions, and for calculation of
elastic design forces (to be used in sizing platform elements together
with API element sizing
criteria).
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