Abstract: The seismic performance of bridges is of paramount importance, particularly in regions prone to seismic activity. This study presents an in-depth analysis of the seismic behavior of a composite bridge structure using the powerful finite element analysis software, ANSYS. The research explores the response of a composite bridge, considering the dynamic forces induced during seismic events. A detailed finite element model is developed, incorporating the various components of the composite bridge, including the superstructure, substructure, and the interaction between different materials such as concrete and steel. The analysis involves subjecting the bridge model to realistic seismic ground motions to simulate real-world conditions. Various parameters are investigated, including the bridge's dynamic response, stresses, deformations, and potential failure modes. Through the utilization of ANSYS, this study provides critical insights into the seismic performance of composite bridges. The findings contribute to enhancing the design and construction of resilient infrastructure capable of withstanding seismic forces, ultimately ensuring the safety and functionality of vital transportation networks.