Maximum Response Estimation Method of an Oscillator Based on Natural Period-Dependent Spectrum Intensity

Abstract

however, it is apparent that a proper Tel value depends on the response of the structure for each ground motion. Thus, this study determines the integration range assuming that Tel is optimally estimated on the basis of the secant slope at the maximum response of an oscillator for each ground motion. The accuracy of the estimation method based on the new SIn.p is demonstrated by using the nonlinear dynamic analysis results of various models of oscillators subjected to 1419 ground motions.

This study proposes a maximum response estimation method based on natural period-dependent spectrum intensity, SIn.p, for an oscillator with a bilinear hysteresis curve. The SIn.p value proposed by Kitahara and Itoh (1999) is defined as an integration of the elastic response spectrum not from 0.1 s to 2.5 s as defined by Housner (1952) but from the elastic first natural period of a structure to the first natural period elongated by its inelastic behavior, Tel . For simplicity, Kitahara and Itoh treated Tel as a constant value for a target structure