CE$6$E$/$EE$/$What are the key theoretical principles underpinning structural analysis in civil engineering? How do these principles facilitate the determination of a structure's stability and load$-$bearing capacity? Discuss the fundamental concepts of soil mechanics and their significance in foundation design and construction. How do engineers utilize principles of fluid mechanics to design efficient drainage systems and hydraulic structures? Explore the theoretical frameworks governing transportation engineering, particularly in traffic flow analysis and road network optimization.