Discuss the principles of structural analysis and their importance in civil engineering. Explain the fundamental concepts of structural loads, including dead loads, live loads, and environmental loads. How do these loads influence the design and behavior of structures? Additionally, elaborate on the role of structural materials such as concrete and steel in construction. How do their properties affect the structural integrity and performance of buildings and infrastructure? Provide examples of real - world applications where these theoretical concepts are applied to ensure the safety and durability of civil engineering projects.