Experimental study on fatigue characteristics of lead rubber bearings under repeated small-amplitude loading

Osamu Kouchiyama, Tomoyuki Kanda, Yasuo Takenaka, Mitsuru Miyazaki, Masahiro Nakamura, Haruyuki Kitamura

Research output: Contribution to journalArticle

Abstract

In surveys on the damage of buildings caused by the 2011 Tohoku- Pacific Ocean earthquake, it was reported that damages such as cracks were detected in a number of lead dampers used in seismically isolated buildings. After investigations of the damaged dampers in detail, it was confirmed that these cracks were generated by accumulation of smallamplitude loading like middle-small earthquakes or winds rather than by large-amplitude loading like large earthquakes or strong winds. From this background, fatigue characteristics of a lead rubber bearing (LRB) under repeated small-amplitude were evaluated by cyclic loading tests of scaled models. The shear-strain amplitudes of the testing were 1%,10%,20% and the maximum number of the cycles the maximum number amplitude was 4000000, 59000, and 17000, respectively.

Original languageEnglish
Pages (from-to)639-644
Number of pages6
JournalAIJ Journal of Technology and Design
Volume21
Issue number48
DOIs
Publication statusPublished - 1 Jun 2015

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Keywords

  • Fatigue
  • Lead rubber bearing
  • Repetition
  • Seismic isolation
  • Small-amplitude loading

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