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Passive control systems for seismic damage mitigation

Authors :
Kasai, Kazuhiko
Fu, Yaomin
Watanabe, Atsushi
Source :
Journal of Structural Engineering. May, 1998, Vol. 124 Issue 5, p501, 12 p.
Publication Year :
1998

Abstract

This paper proposes a simplified theory to predict and compare the seismic performance of viscoelastical (VE)- and elastoplastical (EP)- damped passive control systems, and to demonstrate their ability to protect structures during a major seismic event. Closed-form expressions for 'equivalent period' and 'equivalent damping' of these systems are proposed by idealizing them as linear single-degree-of-freedom (SDOF) systems. The expressions are used to clarify and compare the structural parameters, seismic drift, and force for the systems, based on a common high-damping linear spectrum. By extending the SDOF theory, a seismically deficient 14-story steel moment resisting frame (MRF) is upgraded by inserting VE or EP dampers. Extensive three-dimensional multi-degree-of-freedom nonlinear dynamic analyses are performed for the MRF, VE system, and EP system using earthquakes of various intensities. The 14-story VE and EP systems responded as predicted by the SDOF theory. They show much smaller drifts than the original MRF, keep frame members elastic, and protect nonstructural components, even against major earthquakes.

Details

ISSN :
07339445
Volume :
124
Issue :
5
Database :
Gale General OneFile
Journal :
Journal of Structural Engineering
Publication Type :
Academic Journal
Accession number :
edsgcl.20741393