Simplified method for estimating maximum displacement of inelastic oscillator based on natural period-dependent spectrum intensity

This paper proposes a simplified method for estimating maximum displacement of oscillators with bi-linear, bi-linear-slip, or tri-linear hysteresis curves on the basis of its newly found simple relationship with natural period-dependent spectrum intensity, which is defined here as an integration of an elastic acceleration response spectrum from the elastic natural period of the oscillator to the elongated natural period. On the basis of numerical examples, the accuracy of the proposed method is investigated and shown that the bias of the estimates is much small regardless the characteristics of the oscillator. The dispersion models of the proposed method are also presented. © 2020 Architectural Institute of Japan. All rights reserved.