Steel and Composite Structures

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Using friction dampers in retrofitting a steel structure with masonry infill panels

  • Zahrai, Seyed Mehdi (Center of excellence for Engineering and Management of civil Infrastructures, School of Civil Engineering, the University of Tehran) ;
  • Moradi, Alireza (Department of Civil Engineering, Islamic Azad University) ;
  • Moradi, Mohammadreza (Department of Civil and Environmental Engineering, Old Dominion University)
  • Received : 2014.06.02
  • Accepted : 2015.04.27
  • Published : 2015.08.25
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Abstract

A convenient procedure for seismic retrofit of existing buildings is to use passive control methods, like using friction dampers in steel frames with bracing systems. In this method, reduction of seismic demand and increase of ductility generally improve seismic performance of the structures. Some of its advantages are development of a stable rectangular hysteresis loop and independence on environmental conditions such as temperature and loading rate. In addition to friction dampers, masonry-infill panels improve the seismic resistance of steel structures by increasing lateral strength and stiffness and reducing story drifts. In this study, the effect of masonry-infill panels on seismic performance of a three-span four-story steel frame with Pall friction dampers is investigated. The results show that friction dampers in the steel frame increase the ductility and decrease the drift (to less than 1%). The infill panels fulfill their function during the imposed drift and increase structural strength. It can be concluded that infill panels together with friction dampers, reduced structural dynamic response. These infill panels dissipated input earthquake energy from 4% to 10%, depending on their thickness.

Keywords

References

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