Constant-ductility energy factors of SDOF systems subjected to mainshock–aftershock sequences

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This article focuses on the energy factor of single-degree-of-freedom (SDOF) systems subjected to mainshock–aftershock (MSAS) sequences, of which 163 and 143 are collected from crustal and subduction regions, respectively. The recorded MSAS sequences are divided into four groups based on the relative intensity that is defined as the ratio of the peak ground acceleration (PGA) of an aftershock to the PGA of the corresponding mainshock. Constant-ductility inelastic spectra are calculated to assess the energy factor,...
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