Multi-span Steel Plate Simply Supported Box Steel Girder Bridge

Components of Plate Girders

Mainly there are five components in a girder. The assembly of that five-component is the complete girder. The basic requirement is to make an ” I ” girder having very high bending and shear stiffens in addition to the other local buckling resistances.

Web Plate

Flange

Stiffeners (bearing, longitudinal, and intermediate)

Splices for flange and web

End Connection

1. Web Plate

The vertical plate of the girder is known as the web plate.

Its thickness is based on the design requirements and the height will also be decided based on the site condition and as per the loads applied on the web.

The web normally carries the applied loads on the flange as shear forces. The effect of the web is not usually considered when the design for the bending.

The web is susceptible to buckling when thinner and higher increase when the loads are applied. Therefore, different types of stiffness which will be discussing in this article, are welded to the web have its strength.

2. Flange

There is no specialty other than using a separate plate for the flange. The flange plate will be welded or connected by other means as discussed under different types of plate girders.

Not like rolled sections, we connect the web and the flange together to form the plate girder.

The flange is design to carry the bending action and stiffener or additional plate are provided as per the design requirements.

3. Stiffeners

Stiffeners are provided to enhance structural capacity avoiding the local buckling failures. In addition, they are used to carry the loads applied to the beam until it distributed into the beam.

The following types of stiffeners can be observed in these types of steel elements.

4.End Connection

End connection is the most difficult part of the structural detailing of a steel beam.

When there are continuation or if we are supporting the girder to some support, the connection needs to be designed accordingly.

However, most of the time, plate girders are kept as simply supported at the end support. In such situations, we have to provide the stiffeners at the end connection.

A similar design procedure is followed when designing the endplates and the stiffener provided vertically connecting the web and the flangers.

Application of Plate Girders

Plate girders are widely used as supporting structures in different areas. The following areas can be highlighted as key areas of use.

Bridge construction

Plate girders are mainly used in railway and road bridges. Mostly the old railway bridges can be highlighted as plate girder bridges.

In addition, box girder bridges, beam bridges, military girder composite bridges, and half – through plate girder bridges are considered as it uses.

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