How does the application of structural dynamics theory influence civil engineering projects, particularly in ensuring structural stability, resilience against dynamic loads like earthquakes and wind, and optimizing performance? Explore key principles such as vibration analysis, modal analysis, and dynamic response analysis. How do these principles translate into practical engineering solutions for designing earthquake$-$resistant buildings, bridges, and other infrastructure? Additionally, discuss the integration of advanced technologies like finite element analysis and computer simulations in enhancing understanding and implementation of structural dynamics theory in civil engineering practice.