Dynamic responses of two buildings connected by viscoelastic dampers under bidirectional earthquake excitations

Zhidong Yang, Siu Shu Eddie Lam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

In this study, dynamic responses of two buildings connected by viscoelastic dampers under bidirectional excitations are extensively investigated. The two buildings are a 10-story building and a 16-story building, with the shorter building on the left. Viscoelastic dampers are installed at all floors of the shorter building. Equations of motion are formulated using a fractional derivative model to represent the viscoelastic dampers. Three cases are considered with mass eccentricities at 0, 10% and -10% with respect to the dimensions of the buildings. The responses of the buildings are numerically predicted at different damper properties. The simulation results indicated that the maximum horizontal responses of the buildings without eccentricities are significantly mitigated. However, torsional effects are adversely increased. For asymmetric buildings, the effectiveness of the connecting dampers is affected by building eccentricities. As a result, mass eccentricities must be taken into account in damper selection. When compared with vibrations induced by unidirectional excitations, bidirectional excitations can increase the responses of coupled asymmetric buildings. In addition, installing dampers only at the top floor of the shorter building may cause a sudden change in lateral stiffness of the taller building. Consequently, the story shear envelopes of the taller building are changed.
Original languageEnglish
Pages (from-to)137-150
Number of pages14
JournalEarthquake Engineering and Engineering Vibration
Volume13
Issue number1
DOIs
Publication statusPublished - 1 Jan 2014

Keywords

  • adjacent buildings
  • bidirectional excitations
  • connecting dampers
  • fractional derivative

ASJC Scopus subject areas

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

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