The aim of this analysis is to examine the seismic behavior of the historic Cirimbolu Bridge via two different models developed with the computer program SAP2000. The first model simulated the soil under the bridge, and the seismic behavior of the historic Cirimbolu Bridge with regard to the interaction of soil and the effects of soil-structure interaction behavior was examined. The second model simulated the historic Cirimbolu Bridge as being fixed to the ground. The analysis was performed using acceleration data relevant to the Pazarcık and Elbistan earthquakes, and these earthquakes happened in Turkey on February 6, 2023. The results of both models indicated similar periods and mode shapes; however, SSI contained increased values of frequency. The models’ displacement and stress results were calculated via linear analysis of both models performed via the time domain method. The largest displacement is calculated at the top of the bridge via both models. Significant decreases in displacement and stress values of the models are calculated when simulating the soil as fixed. Moreover, the fixed soil model results are supplemented with different strengthening methods such as steel tendons, CFRP, and FRCM. The analysis results show that steel tendon reinforcement is successful.
