ENLIGHTENMENT OF TURKEY M7.8 EARTHQUAKE ON THE REVISION OF SEISMIC DESIGN RESPONSE SPECTRUM IN CHINA

The seismic design response spectrum is a key parameter for determining the potential seismic loading of the structure. The calibration of the design response spectrum is a significant research content of seismic engineering. Differential evolution algorithm is used to calibrate the spectral curve parameters in this study, based on 8, 9 and 10 Chinese seismic intensity records of Turkey's 7.8 magnitude earthquake on February 6, 2023. The characteristics of the calibration spectral parameters are analyzed and compared with the design spectrum. The conclusions are as follows: The response spectrums of the 8 intensity records are lower than the design spectrum of fortification level, the response spectrums of 9 and 10 intensity records are much higher than the design spectrum of rarely level in the spectral period of 1 s-3 s, and they are lower than the design spectrum of rare level when the spectral periods over 4 s. Calibration spectral parameters of T_g, β_max and γ are distributed between 0.2-1.2, 1.2-3.2, and 0.8-2.0, respectively. The distribution of β_max is more sensitive to the V_s30 than R_rup, and the β_max decreases with the increases of V_s30. The width of the design spectrum platform section is narrower than the peak section of the record spectrum of station 2708, and the value of β_max is lower than the peak of the record spectrum of station 4614. This study suggests increasing the value of β_max and the width of platform section to fit high intensity ground motion.