Abstract
This paper proposes the method to estimate a structure coefficient Ds based on displacement response. First, estimation formulas of displacement response are evaluated for the bi-linear type design velocity response spectrum using the equivalent linear method. Next, the method to determine a value of Ds is proposed by using the estimated displacement response. Finally, trends of the values of Ds determined here to the initial period, energy absorption ability, and allowable deformation are investigated. They have the following tendencies. 1) Increase like a hyperbola having the upper limit along with the reduction of the period ratio TR. 2) Reduce like straight line along with the increase of equivalent viscous damping coefficient β. 3) Reduce like straight line or like the exponential function having the upper bound along with the increase of allowable ductility factor μ.
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