Parameters and damage potential of large-amplitude ground motions

Abstract:

To study the properties and effects of high-amplitude ground motion, while modifying the design spectra, 60 records from 20 events satisfying at least one of the following requirements: PGA≥1 g, PGV≥100 cm／s or PGD≥100 cm, were collected and analyzed. The evaluation factors for ground motions’ damage potential related with the ground motions’ characteristics were summarized and the Factor Analysis Method was used to realize the simplification and integration. Explanation of new factors’ physical meanings was also discussed. Additionally, characteristic periods and the maximum amplification coefficients for the large-amplitude ground motions were calculated and compared with those adopted in current design codes. Suggestions on the modification of design spectra were indicated based on the possibility of potential hazard.