Problem $90((($ In civil engineering, theoretical bases encompass principles from various disciplines, including physics, mathematics, and material science, to address the behavior and design of structures, infrastructure, and construction processes. These theories underpin the analysis of forces, stresses, and strains in materials, aiding in the development of robust, safe, and efficient engineering solutions. By integrating theoretical frameworks with practical applications, civil engineers optimize projects for durability, sustainability, and resilience in diverse environmental conditions, ensuring the integrity and longevity of built environments.