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Development of an Evaluation Method for Seismic Isolation Systems of Nuclear Power Facilities: Part 6 — Scaled Tests to Obtain Basic Characteristics of Lead Rubber Bearing

[+] Author Affiliations
Tsutomu Hirotani, Ryota Takahama

Shimizu Corporation, Tokyo, Japan

Masaki Yukawa

Obayashi Corporation, Tokyo, Japan

Hiroshi Hibino

Taisei Corporation, Kanagawa, Japan

Yuji Aikawa

Taisei Corporation, Tokyo, Japan

Hideo Hirai

Toshiba Corporation, Yokohama, Kanagawa, Japan

Tetsuo Imaoka

Hitachi-GE Nuclear Energy, Ltd., Hitachi, Ibaraki, Japan

Hiroshi Shimizu

Mitsubishi Heavy Industries, Ltd., Takasago, Hyogo, Japan

Yoshito Umeki

Chubu Electric Power Co., Inc., Nagoya, Japan

Paper No. PVP2014-29002, pp. V008T08A013; 10 pages
doi:10.1115/PVP2014-29002
From:
  • ASME 2014 Pressure Vessels and Piping Conference
  • Volume 8: Seismic Engineering
  • Anaheim, California, USA, July 20–24, 2014
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4607-0
  • Copyright © 2014 by ASME

abstract

This paper provides a series comprising the “Development of Evaluation Method for Seismic Isolation Systems of Nuclear Power Facilities”. Part 6 presents scaled tests for Lead Rubber Bearing (LRB) newly developed for this project.

Following tests are performed to obtain the basic characteristics of LRB,.

(1) Horizontal and Vertical Simultaneous Loading Test:

LRBs with diameter of 250mm are tested dynamically under simultaneous axial and lateral loading. The hysteresis characteristics is not changed under compressive load although it is changed under tensile load.

(2) Basic Break Test:

LRBs with a diameter of 800mm are tested statically under various combinations of axial and lateral forces. The hysteresis characteristics model of LRB is determined by this test. It is confirmed that the breaking strain of LRB under compression load exceeds 450%.

(3) Horizontal Hardening and Vertical Softening Test:

For LRBs with a diameter of 1200 mm, 75% scale of actual LRB are tested statically for horizontal hardening and vertical softening regions. It is confirmed that the hysteresis model which is developed by smaller LRBs is applicable to these large scale models.

Copyright © 2014 by ASME

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