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A bridge that supports its deck using girders is known as a girder bridge. The plate and box forms of modern steel girder bridges are the two most prevalent. When discussing bridge design, the words “girder” and “beam” are frequently used interchangeably. Beam bridges are defined slightly differently from girder bridges by several writers.
A girder can be made of steel or concrete. Concrete box girders are used in many shorter bridges, particularly in rural areas where they can be subject to water overtopping and corrosion. Typically, a steel beam is referred to as a “girder.” In a beam or girder bridge, the beams themselves serve as the deck’s main structural support and are in charge of distributing the load to the base. The amount of weight that a beam can support depends on its shape, weight, and material type.
The height of a girder is the most important factor affecting its load capacity because of the characteristics of the second moment of area. A deeper beam will be produced by longer spans, increased traffic, or wider beam spacing, among other factors. The girders still serve as the deck’s primary support in truss and arch-style bridges, but the load is transmitted from the truss or arch to the foundation. With the use of these designs, bridges can traverse greater distances without having to expand the beam’s depth beyond what is practical. However, the bridge is no longer a real girder bridge if a truss or arch is included.
The Global girder bridge market accounted for $XX Billion in 2021 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2022 to 2030.
Washington State DOT, the new southbound I-5 Puyallup River Bridge in Tacoma will feature the longest prestressed concrete girder constructed in North America. The Puyallup River and several railroad tracks will be crossed by a bridge that will carry southbound I-5 traffic over this enormous girder and others that are nearly as large.
These girders will be installed during construction. The girders will be transferred from their present location at Concrete Technology Corporation in Tacoma to their new location on the southbound side of the new I-5 Puyallup River bridge by construction workers. Three to five girders will be placed each night by two cranes. This last pair of girders, together with those that have already been installed, will eventually form the framework of the new bridge.
