A steel girder bridge is a type of bridge structure that uses steel girders as the main supporting element. Steel girders are long, horizontal beams that are typically made of steel and are used to support the weight of the bridge deck and any vehicles or other loads that are traveling across it.
Steel girder bridges are popular because of their strength, durability, and ability to span long distances. They are commonly used for highway overpasses, railroad bridges, and pedestrian bridges. The design of the bridge can vary depending on the requirements of the specific project, but generally, steel girders are placed across piers or abutments and spaced apart to form the main structural support system for the bridge deck.
The size and spacing of the steel girders depend on the weight of the load the bridge needs to support, the span of the bridge, and other design factors. Typically, steel girder bridges are constructed off-site and then transported to the construction site, where they are lifted into place using cranes or other heavy equipment.
Advantages of steel girder bridges include their ability to support heavy loads, their long lifespan, and their resistance to fire, rot, and pests. They also require less maintenance than other types of bridge structures, such as concrete bridges. However, they can be more expensive to construct initially, and their weight can make transportation and installation more challenging.