After the Great Hyogoken-nanbu Earthquake (1995), the Seismic Design Code for High-Pressure Gas Facilities of Japan was amended. This amended code requires two-step seismic assessments, that is, the evaluation of the Level 1 Required Seismic Performance for Level 1 earthquakes and that of the Level 2 Required Seismic Performance for Level 2 earthquakes. Seismic design of piping systems is newly included within the scope of the code. For Level 2 earthquakes, possible ground displacement due to liquefaction is taken into account. The evaluation method of the Level 1 Required Seismic Performance is specified in the amended code and that of the Level 2 Required Seismic Performance is proposed in the guideline. The evaluation of the former is based on elastic design and that of the latter on elastoplastic design. The propriety of the design criteria of piping systems with respect to ground displacement was confirmed by large deformation tests. In this paper, seismic design criteria of piping systems in the amended code and the evaluation method of the Level 2 Required Seismic Performance proposed in the guideline are introduced, and the results of the large deformation tests are reported.

Issue Section:
Technical Papers
Keywords:
pressure vessels, earthquakes, safety, seismology, liquefaction, deformation
Topics:
Displacement, Earthquakes, Pipes, Piping systems, Design, Deformation, Earthquake resistant design
1.
MITI (Ministry of International Trade and Industry of Japan), 1981, “Seismic Design Code for High-Pressure Gas Facilities,” MITI Notification 515 (in Japanese).
2.
MITI Notification 143, 1997, Notification of amendment of a part of MITI Notification 515 (in Japanese).
3.
KHK (High-Pressure Gas Safety Institute of Japan), 2000, “Guideline of Seismic Design of High-Pressure Gas Facilities,” KHK E 012-2000 (in Japanese).
4.
Shibata, H., Suzuki, K., and Ikeda, M., 2002, “Developments of Seismic Design Code for High-Pressure Gas Facilities in Japan,” Seismic Engineering, ASME PVP-Vol. 445-1, Volume 1, pp. 17–23.
5.
Mukaimachi, N., Ando, F., and Ikeda, M., 2002, “An Advanced Computational Method for Nonlinear Behavior of Piping Systems Subjected to Earthquake Load,” Seismic Engineering, ASME PVP-Vol. 445-1, Volume 1, pp. 119–126.
6.
Ando, F., Sawa, T., and Ikeda, M., 2002, “A New Design Method for Piping Components Against Leakage and Damage Subjected to High Level Earthquake Load,” Seismic Engineering, ASME PVP-Vol. 445-1, Volume 1, pp. 113–118.
Copyright © 2004
 by ASME
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