What is welded plate girder?

What is welded plate girder?

Overview. In a plate girder bridge, the plate girders are typically I-beams made up from separate structural steel plates (rather than rolled as a single cross-section), which are welded or, in older bridges, bolted or riveted together to form the vertical web and horizontal flanges of the beam.

What are the types of plate girder bridge?

Types of Plate Girders

• Reverted Plate Girder. It is a combination of flanges, web, and other necessary stiffness.
• Welded Plate Girders.
• Web Plate.
• Flange.
• Stiffeners.
• Splices for Flange and Web.
• End Connection.

Why plate girder is welded?

Usually, the flange and web plates are connected by welding (Figure 7.1). Girders fabricated in this manner are known as welded plate girders and their depth to web thickness ratio (d/t w) may be up to 400. Because of higher d/t w, the buckling of the web becomes the major problem with these girders.

What is through type plate girder?

For long or heavily loaded bridge spans, restrictions on depth of structural system imposed by vertical clearances under a bridge generally favor use of through construction. Through girders support the deck near their bottom flange.

Which span the plate girders are used?

They consist of plates and angles riveted together. Plates and angles form an I-section. They are used in building construction and also in bridges. Plate girders are economically used for spans upto 30m.

What are the types of stiffeners?

There are two principal types of stiffener:

• Longitudinal web stiffeners, which are aligned in the span direction.
• Transverse stiffeners, which are aligned normal to the span direction of the beam.

Why is girder used?

A girder is a large and deep type of beam that is used in construction. It is typically capable of longer spans and taking greater loads than a normal beam, and is often used as a main horizontal structural support for smaller beams, such as in bridge construction.

What is the purpose of stiffeners?

Stiffeners are employed to resist lateral loading of the plate and are usually made from the rolled shapes integrally welded to the plate. Such stiffeners are distinct from the other stiffeners used to prevent plate buckling.

How is the girder bridge built?

A rolled steel girder bridge is built using I-beams made from prefabricated steel, while a plate girder bridge is constructed by welding flat pieces of steel together on-site to make the I-beams.

What are the elements of a plate girder?

The plate girder consists of following components: The web plate Flange plate (addition of cover plate curtailed at proper sections) Stiffeners like bearing stiffeners, longitudinal stiffeners, and intermediate stiffeners Splices for flange plate and web plate End connections

Are steel girders different from steel beams?

The major difference between steel beams and steel girders is the size. Usually, large beams are known as girders. If a large beam horizontally supports a structure then it is a steel girder.

What does plate girder mean?

plate girder (Noun) a beam built of steel plates and shapes welded or bolted together to form a deep beam larger than could be produced by a rolling mill How to pronounce plate girder?