Derivation of Response Spectra and Hysteretic Energy: A Case Study on 2023 Turkey-Syria Earthquake in Consideration of Structural Ductility

Structural response under strong ground motion has always been of concern in engineering seismology due to low predictability of seismic events and their devastating impact. The energy-based seismic design (EBSD) is proposed to capture the cumulative damage of the structure in terms of evaluating hysteretic energy, which is a more reasonable design method considering inelastic deformation of structures. On the other hand, structural ductility demand is another significant aspect of design. In this paper, the response spectra and hysteretic energy under different ductility factors are derived and quantified based on a selection of ground motion records from the recent 2023 Turkey-Syria earthquake mainshock (M7.7) and aftershock (M7.6). The results show that for the selected data, the peak value of acceleration response spectra significantly exceeds the design acceleration, and the hysteretic energy for M7.7 presents a relatively high value while the value for M7.6 is comparatively lower. Even if the evaluation for the M7.6 event is minor, it is worth considering the structural vulnerability under cumulative damage and residual influence from the mainshock.