The use of approximate entropy in the generation of a seismic performance index for wooden buildings

Ayaka Take, Akira Mita

Research output: Contribution to journalConference articlepeer-review


The main purpose of this paper is to present an alternative performance index using approximate entropy. We focus our attention on a correlation with the complexity of vibration as an indication of potential damage in the building. When there is abnormality in human cells, the vibration of these cells becomes irregular. Using this as inspiration, the complexity of vibrations in a wooden building will be used as a performance index. In this study, we chose Approximate Entropy to represent this complexity. A series of experiments for two wooden houses was conducted. Those two houses were put on the vibration table called 'E-defense', and excited by a white noise in various levels and by a recorded earthquake motion. The value of Approximate Entropy and natural frequency were calculated from the acceleration response of the houses. It is indicated that Approximate Entropy has a good correlation with natural frequencies which may indicate a correlation with damage.

Original languageEnglish
Pages (from-to)95-99
Number of pages5
JournalMaterials Forum
Publication statusPublished - 2008 Dec 1
Event2nd Asia-Pacific Workshop on Structural Health Monitoring, 2APWSHM - Melbourne, VIC, Australia
Duration: 2008 Dec 22008 Dec 4


  • Approximate entropy
  • Complexity
  • Performance index
  • System identification
  • Wooden buildings

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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