Rate-Independent Linear Damping for the Improved Seismic Performance of Inter-Story Isolated Structures

Ashkan Keivan, Ruiyang Zhang, Darioush Keivan, Brian M. Phillips, Masahiro Ikenaga, Kohju Ikago

Research output: Contribution to journalArticlepeer-review


In this study, rate-independent linear damping (RILD) is proposed for the seismic protection of inter-story isolated structures. For practical applications, the RILD force is approximated using a causal algorithm and then tracked using semi-active control. Both numerical simulation and shake table real-time hybrid simulation (RTHS) are used to study a 14-story inter-story isolated structure. First, the causal approximation of RILD evaluated in RTHS is compared to numerical simulation. Second, the benefits of RILD for inter-story isolated structures are demonstrated as compared to conventional damping. RILD offers an attractive control alternative by restricting isolation layer displacements without amplifying accelerations.

Original languageEnglish
JournalJournal of Earthquake Engineering
Publication statusAccepted/In press - 2020 Jan 1


  • inter-story isolation
  • Rate-independent linear damping
  • real-time hybrid simulation
  • semi-active control
  • shake table testing

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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