task $99===$What are the foundational theories underpinning civil engineering practices? Explore the fundamental principles governing structural analysis, materials science, fluid mechanics, and geotechnical engineering. Investigate the theoretical frameworks guiding construction methods, transportation systems, and environmental considerations within civil engineering. Delve into concepts such as stress and strain, equilibrium, deformation behavior of materials, and the mechanics of fluid flow. Examine how these theories are applied in designing infrastructure, ensuring safety, sustainability, and efficiency in various civil engineering projects. Explore the interdisciplinary nature of civil engineering, where principles from physics, mathematics, and other fields converge to address complex engineering challenges.