Journal
EARTHQUAKE SPECTRA
Volume 37, Issue 2, Pages 1078-1107Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/8755293020952461
Keywords
Earthquake sequences; energy factor; single-degree-of-freedom systems; IMK model; seismic design
Categories
Funding
- Scientific Research Fund of Institute of Engineering Mechanics, China Earthquake Administration [2019D06]
- Fundamental Research Funds for the Central Universities
- NSRIF [2020085]
- China Postdoctoral Science Foundation [2019T120272, 2018M641834]
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This article focuses on the energy factor of single-degree-of-freedom (SDOF) systems subjected to mainshock-aftershock (MSAS) sequences. It divides recorded MSAS sequences into four groups based on relative intensity and calculates constant-ductility inelastic spectra to assess the energy factor. The effect of various factors on the energy factor is thoroughly analyzed, and a predictive model is developed to facilitate energy-based seismic design of structures.
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, gamma, defined as the ratio of the covered area of the skeleton load-deformation curve of the inelastic structural system to that of the corresponding elastic system with identical elastic properties, by considering various levels of structural inelasticity. Moreover, the effect of the hysteresis law, damping ratio, post-yield stiffness ratio, soil condition, and relative intensity on the energy factor is thoroughly analyzed. A predictive model is also developed as a function of the ductility factor, vibration period, damping ratio, and post-yield stiffness ratio. Such a model is expected to facilitate the energy-based seismic design of structures.
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