What are the fundamental principles and methodologies behind structural analysis in civil engineering? Discuss the various analytical techniques used to assess the behavior and stability of structures under different loading conditions. Explore the significance of factors such as material properties, geometric configurations, and boundary conditions in determining structural response. Furthermore, delve into the theoretical frameworks such as equilibrium equations, compatibility conditions, and energy methods that underpin structural analysis. Consider how these principles are applied in designing resilient and efficient structures across various engineering disciplines, emphasizing the importance of understanding structural behavior for ensuring safety and sustainability in infrastructure projects.