26-01-2012, 02:37 PM
EARTHQUAKE RESPONSE OF STORY-DRIFT-CONTROLLED REINFORCED CONCRETE BUILDINGS WITH HYSTERETIC DAMPERS
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INTRODUCTION
Hysteretic dampers are additional devices installed and
strategically placed in the primary structure (generally steel
framed buildings) in order to absorb most of the vibrational
energy exerted by ground motion minimizing the structural
damage in the components of the primary structure. Up to
present by tradition, most of the structural design
methodologies have been based on the definition of forces
required to be resisted by a building whose response must
be within certain deformation limits and extent of
structural damage.
METHODOLOGY
Two R/C buildings were analyzed: one with bucklingrestrained
braces (BRB) as hysteretic dampers and another
with a generic hysteretic damper model. The structures
investigated are 10-story moment-resistant reinforced
concrete buildings with dampers installed at each story at
the center bay at each frame as illustrated in Figure 1b. In
the case of BRBs in Figure 1a, Frame-C was analyzed
representing the behavior of the whole building
RESULTS AND DISCUSSIONS
Figure 5 and Figure 6 present the energy dissipated by
main frame EHF and damper system EHD in relation to the
total energy dissipated by hysteresis behavior EHS.
Horizontal axis denotes the strength ratio. Almost all input
motions present a relatively flat region at which
participation of main frame is minimized.
CONCLUSIONS
The interval at which the protection of main frame is
maximized tends to enlarge and become more uniform as ν
decreases. This effect has remarkable meaning in the
engineering practice as it would regard possible
modifications of the real response due to uncertainties such
as construction process and material strength reliability.
Reduction of the inelastic work in the main frame was
obtained for almost all strength ratios and drift ratios
