Earthquakes and Structures

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Effectiveness of design procedures for linear TMD installed on inelastic structures under pulse-like ground motion

  • Quaranta, Giuseppe (Department of Structural and Geotechnical Engineering, Sapienza University of Rome) ;
  • Mollaioli, Fabrizio (Department of Structural and Geotechnical Engineering, Sapienza University of Rome) ;
  • Monti, Giorgio (Department of Structural and Geotechnical Engineering, Sapienza University of Rome)
  • Received : 2014.12.30
  • Accepted : 2015.10.12
  • Published : 2016.01.25
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Abstract

Tuned mass dampers (TMDs) have been frequently proposed to mitigate the detrimental effects of dynamic loadings in structural systems. The effectiveness of this protection strategy has been demonstrated for wind-induced vibrations and, to some extent, for seismic loadings. Within this framework, recent numerical studies have shown that beneficial effects can be achieved by placing a linear TMD on the roof of linear elastic structural systems subjected to pulse-like ground motions. Motivated by these positive outcomes, closed-form design formulations have been also proposed to optimize the device's parameters. For structural systems that undergo a near-fault pulse-like ground motion, however, it is unlikely that their dynamic response be linear elastic. Hence, it is very important to understand whether such strategy is effective for inelastic structural systems. In order to provide new useful insights about this issue, the paper presents statistical results obtained from a numerical study conducted for three shear-type hysteretic (softening-type) systems having 4, 8 and 16 stories equipped with a linear elastic TMD. The effectiveness of two design procedures is discussed by examining the performances of the protected systems subjected to 124 natural pulse-like earthquakes.

Keywords

Acknowledgement

Grant : Sostenibilita sismica, tecnologica ed energetico ambientale negli interventi di riabilitazione/riuso sul patrimonio esistente: edifici strategici e ad uso pubblico

Supported by : Sapienza Universita di Roma

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