Structural analysis is a branch of civil engineering and mechanical engineering that focuses on the study of the behavior of structures under different loading conditions. It involves analyzing and designing structures such as buildings, bridges, and tunnels to ensure they can support their intended loads and withstand external forces such as wind, earthquakes, and vibrations. Structural analysis uses principles of mechanics and materials science to predict the response of structures to various stresses and strains, and to optimize their design for safety, efficiency, and durability. This field is essential for ensuring the safety and functionality of infrastructure projects and is widely used in construction and engineering industries.