Structural analysis is a method used in engineering and architecture to determine the effects of loads on physical structures. It involves calculating the internal forces, moments, and displacements within structures like beams, bridges, and buildings to ensure they can safely support the intended loads. This process helps engineers design safe and efficient structures by predicting how they will respond to various forces, such as weight, wind, and earthquakes. Tools like finite element analysis and computer simulations are often employed to visualize and assess structural behavior under different conditions.