Explore key theoretical concepts such as structural mechanics, soil mechanics, fluid dynamics, and materials science. Investigate how these theories inform the planning and construction of bridges, buildings, roads, and other vital infrastructure, ensuring durability, safety, and sustainability. Discuss the role of advanced computational tools and modeling techniques in applying theoretical principles to real$-$world engineering challenges. Moreover, consider how ongoing research in theoretical civil engineering expands knowledge boundaries, addresses emerging issues like climate change resilience, and enhances the efficacy of infrastructure systems.