Spectrum-based response prediction of asymmetric structure with supplemental viscous damping

Kazuhiko Kasai, Tadamichi Yamashita, Yoshihiro Yamazaki, Takeru Igusa

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Seismic response of one-story structure with the significant stiffness eccentricity, developing a torsional mode, is studied in this paper. Viscous damping is added to reduce both the translational and torsional vibration of the structure. The structure in such a case possesses the so-called non-proportional damping, which makes the conventional modal analysis using undamped vibration mode more inaccurate. On the other hand, more accurate method using the complex-valued mode is not easy for practical analysis, and is not very effective to understand dynamic response characteristics of the structure. Hence, this paper proposes a new modal analysis which uses the real-valued mode and yet treats the non-proportional damping effect with a unique correction process. Many cases of non-proportional damping are examined, and the reasonable accuracy of the proposed method is demonstrated through comparison with the other existing methods.

Original languageEnglish (US)
Pages (from-to)225-234
Number of pages10
JournalJournal of Structural and Construction Engineering
Issue number636
StatePublished - Feb 2009


  • Asymmetric frame structure
  • Complete-Quadratic-Combination rules
  • High viscous damping
  • Non-proportional damping
  • Response spectral method

ASJC Scopus subject areas

  • Architecture
  • Building and Construction


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