How does the interplay between soil mechanics and structural dynamics influence the design and performance of civil engineering structures? Elaborate on the intricate relationship between soil behavior, structural response, and the consequent implications for infrastructure resilience. Explore how variations in soil composition, moisture content, and loading conditions affect the dynamic behavior of structures such as bridges, dams, and skyscrapers. Consider the role of geotechnical investigations in predicting soil behavior under different loading scenarios and the subsequent impact on structural stability and serviceability. Additionally, delve into the challenges posed by dynamic loading events such as earthquakes, wind forces, and vehicular traffic, and how engineers mitigate these challenges through innovative design strategies and materials selection. Evaluate the importance of interdisciplinary collaboration between geotechnical engineers, structural engineers, and construction professionals in ensuring the longevity and safety of civil engineering projects amidst dynamic environmental conditions.