Abstract
This paper deals with steel frames combined with hysteretic dampers and examine the strength required for the main frames consisting of beams and columns not to go beyond yielding under earthquake loading. Dynamic response analysis is carried out for equivalent single degree of freedom system, and interaction between the obtained responses and various structural parameters including the base shear coefficient CB is quantified. An analytical expression of CB is also formulated based upon the energy balance consideration. Primary parameters that control CB are found to be (1) the damper's shear strength ratio to the maximum resistance (β) and (2) the relative stiffness between the damper and main frame. It is also pointed out that an optimum j3 does exist by which CB can be minimized.
