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Earthquake Engineering and Engineering Vibration

, Volume 18, Issue 1, pp 113–127 | Cite as

Development of basic technique to improve seismic response accuracy of tributary area-based lumped-mass stick models

  • Yu-Chen Ou
  • Ibrahim Hashlamon
  • WooSeok Kim
  • Hwasung RohEmail author
Article
  • 17 Downloads

Abstract

Although a detailed finite element (FE) model provides more precise results, a lumped-mass stick (LMS) model is preferred because of its simplicity and rapid computational time. However, the reliability of LMS models has been questioned especially for structures dominated by higher modes and seismic inputs. Normally, the natural frequencies and dynamic responses of a LMS model based on tributary area mass consideration are different from the results of the FE model. This study proposes a basic updating technique to overcome these discrepancies; the technique employs the identical modal response, D(t), to the detailed FE model. The parameter D(t) is a time variable function in the dynamic response composition and it depends on frequency and damping ratio for each mode, independent of the structure’s mode shapes. The identical response D(t) for each mode is obtained from the frequency adaptive LMS model; the adaptive LMS model which can provide identical modal frequencies as the detailed FE model. Theoretical backgrounds and formulations of the updating technique are proposed. To validate the updating technique, two types of structures (a symmetric straight column and an unsymmetric T-shaped structure) are considered. From the seismic response results including base shear and base moment, the updating technique considerably improves the seismic response accuracy of the tributary area-based LMS model.

Keywords

lumped-mass stick models seismic responses modal frequency eigenvectors response accuracy 

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Notes

Acknowledgment

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and technology under Grant No. 20151D1A3A01020017.

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Copyright information

© Institute of Engineering Mechanics, China Earthquake Administration and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yu-Chen Ou
    • 1
  • Ibrahim Hashlamon
    • 2
  • WooSeok Kim
    • 3
  • Hwasung Roh
    • 2
    Email author
  1. 1.Department of Civil EngineeringTaiwan University (NTU)TaiwanChina
  2. 2.Department of Civil EngineeringChonbuk National UniversityJeonjuSouth Korea
  3. 3.Department of Civil EngineeringChungnam National UniversityDaejeonSouth Korea

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