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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