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CONCRETE
LIBRARY OF JSCE NO. 38, DECEMBER 2001 |
VERIFICATION OF SEISMIC PERFOMANCE OF IN-GROUND LNG TANK
STRUCTURES -STUDY ON STREAMLINING
BY DYNAMIC NONLINEAR ANALYSIS METHOD- |
(Translation from Concrete Library 98
of JSCE, December 1999) |
This
report demonstrates that the design safety margin employed when designing the
reinforced concrete structure of an in-ground LNG tank can be reduced through
the use of a more sophisticated analytical methodology, thus streamlining
construction. In conventional design, a method of equivalent linear analysis
is applied to determine the amount of reinforcement required to achieve a
particular ultimate sectional strength, even for Level 2 earthquake motion.
The more sophisticated approach is to apply dynamic nonlinear analysis, after
determining the amount of reinforcement required to withstand Level 1 motion,
and then ensuring that ductility adequate to withstand Level 2 motion. The
application of this more sophisticated analytical method makes it possible to
more accurately analyze the behavior of members, thus not only reducing the
amount of reinforcement needed but also improving safety. |
Key
Words: In-ground LNG tank, dynamic nonlinear analysis, streamlining
reinforced concrete structure |