- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | LI Han, BAI Yu, YE Liaoyuan, PAN Wen. Analysis of Characteristic Parameters of Seismic Design Spectrum in Yunnan Region Based on Pseudo Acceleration Spectrum[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20250355
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To investigate the issue that the response spectrum for structures with high damping exceeds that with low damping in the long-period range in code design spectra, strong earthquake records with magnitudes greater than 4.5 in the Yunnan region since 2007 were collected based on the pseudo acceleration response spectrum theory considering the true inertial forces of structures. A classification system based on the site category classification standard, magnitude, epicentral distance, and design earthquake group was established. A differential evolution algorithm with global and neighborhood mutation was employed to calibrate and obtain the average values of the calibration parameters under each category. On this basis, the effects of various factors on the characteristic period, the plateau value of the amplification factor spectrum, and the decay index were obtained, and the recommended parameter values for the Yunnan region were ultimately proposed. The results indicate that both site category and epicentral distance have a positive correlation with the characteristic period $ {T}_{\text{g}} $. The recommended values for design earthquake groups under different site categories proposed based on the calibration results are increased by 0.05 s on average compared with the code recommended values. Epicentral distance and magnitude have a weak effect on the plateau value of the amplification factor spectrum $ {\beta }_{\max } $, and no clear regularity is shown. The calibration result of $ {\beta }_{\max } $is larger than the code value. Considering the statistical results and engineering safety redundancy comprehensively, it is suggested that the value range of $ {\beta }_{\max } $ in the Yunnan region be set to 2.575–2.675. The damping ratio is the most dominant factor affecting the decay index
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