"What are the key principles behind structural analysis in civil engineering? Explore methods like finite element analysis $($FEA$)$ and structural dynamics. Discuss factors influencing structural integrity, such as material properties, load distribution, and environmental conditions. Analyze the role of computer$-$aided design $($CAD$)$ in modeling and optimizing structures. Provide examples showcasing the application of civil engineering principles in infrastructure projects like bridges, skyscrapers, and dams."