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A compatible energy demand estimate considering code-specified design spectra
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DOI：10.1016/j.soildyn.2020.106273.png)
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To make the energy demand estimate in the energy-based seismic design (EBSD) approach consistent with current seismic design framework, compatible design energy spectra consisting of input energy spectra and hysteretic-to-input energy ratio spectra are proposed. A direct relation between the input energy spectrum and the pseudo-acceleration spectrum is theoretically established by the frequency-domain earthquake response of a single-degree-of-freedom (SDOF) system. The code-specified site classification in the design pseudo acceleration spectra can be directly addressed in the proposed input energy spectra. The strength reduction factor is used to account for the degree of plasticity in the hysteretic-to-input ratio energy spectra. The feasibility and accuracy of the proposed spectra are verified on single-story reinforced concrete frames. The ground motions for verification are selected by the rules that both the pseudo-acceleration spectrum and the input energy spectrum are fitted with the design spectra, proposing a new selection method from the perspective of energy.
Keyword:
Code-specified energy spectrum
Earthquake input energy
Hysteretic energy
Energy-based seismic design
Ground motion selection
Time history analysis
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