5th INTERNATIONAL CONGRESS ON KHAZAR SCIENTIFIC RESEARCH AND INNOVATION
SOIL RESPONSE ANALYSES FOR DİFFERENT RECORD GROUPS
Site-specific ground response analyses are conducted to determine the variation of earthquake ground motion defined at the bedrock level as it propagates through soil layers and the resulting ground motion at the surface. In this study, behavior analyses of representative soil profiles selected for an investigation area in Bursa were performed using the DeepSoil 7.1 software, and the effects of record groups selected based on different criteria on surface behavior were examined. Ground motion records were selected and scaled from the PEER database to match the target spectrum. In the first phase of the study, the target spectrum was determined for the ZB soil class, assumed to have a shear wave velocity of 760 m/s as bedrock, based on the AFAD Turkey Earthquake Hazard Maps Interactive Web Application. Considering the possible magnitude range for seismic sources within a 60 km radius around the investigation area, the selected records were divided into five groups based on distance criteria ranging from 10 km to 60 km. For each group, 11 records with the smallest root-mean-square error in matching the target spectrum were selected. In the second stage of the study, another record group was created for the determined criteria by considering only one of the possible seismic sources closest to the study area and was used in the ground response analyses together with the record group selected for distances between 0-10 km in the first stage. The geometric means of the spectra at the ground surface for each group of records were compared with the proposed design spectra based on the soil class of the study area. The results of the study showed the importance of the interaction between the soil and ground motion.
