In construction, H - beam is widely used due to its excellent structural properties. It serves as the main load - bearing component in buildings, such as columns and beams. Its high moment of inertia and strong resistance to bending make it ideal for supporting large - span structures, like factory buildings, warehouses, and multi - story commercial buildings. For example, in high - rise buildings, H - beams are used to form the frame structure, distributing the weight of the building and external loads effectively. H - beam is also commonly used in bridge construction. It can be used for bridge girders, providing the necessary strength to support the traffic load and withstand the dynamic forces from vehicles.