How does the concept of structural dynamics influence the design and analysis of modern civil engineering projects, particularly in the context of ensuring resilience against dynamic loads such as wind, earthquakes, and vehicular traffic? Discuss the theoretical framework underlying structural dynamics, including the principles of natural frequency, damping, and mode shapes. How do civil engineers utilize these concepts in the computational modeling and simulation of structures to predict and mitigate the impact of dynamic loads? Furthermore, consider the implications of advanced materials and construction techniques on the theoretical approaches to structural dynamics. How are current research trends and technological advancements shaping the future of structural dynamics in civil engineering? In your answer, address the challenges that engineers face in integrating complex dynamic behavior into practical design processes, and how interdisciplinary collaboration and innovation are contributing to overcoming these challenges.