Prediction of hysteretic energy demands in steel frames using vector-valued IMs

Abstract

It is well known the importance of considering hysteretic energy demands for the seismic assessment and design of structures. In such a way that it is necessary to establish new parameters of the earthquake ground motion potential able to predict energy demands in structures. In this paper, several alternative vector-valued ground motion intensity measures (<i>IMs</i>) are used to estimate hysteretic energy demands in steel framed buildings under long duration narrow-band ground motions. The vectors are based on the spectral acceleration at first mode of the structure <i>Sa</i>(<i>T</i>₁) as first component. As the second component, <i>IMs</i> related to peak, integral and spectral shape parameters are selected. The aim of the study is to provide new parameters or vector-valued ground motion intensities with the capacity of predicting energy demands in structures. It is concluded that spectral-shape-based vector-valued <i>IMs</i> have the best relation with hysteretic energy demands in steel frames subjected to narrow-band earthquake ground motions.