$2222\mathrm{.}00000$ What are the theoretical foundations that underpin civil engineering practices, encompassing principles of structural analysis, material mechanics, and geotechnical engineering? Explore the fundamental theories governing the behavior of materials under various loads, the principles guiding the design and construction of infrastructure such as bridges and buildings, and the theories informing soil mechanics and foundation design. Consider the significance of these theories in ensuring the safety, durability, and sustainability of civil engineering projects.