Plate Girders and Flange Angle

Plate girders are structural beams that are made by welding plates together to form the desired shape. The plates are usually arranged in a box-like shape, with a top and bottom flange connected by a vertical web. The flanges are the parts of the girder that extend outward and provide support to the structure above. They are usually made from steel angles or plates.

Flange Angle

Flange angles are the most common type of flange used in plate girders. They are L-shaped steel sections that are attached to the top and bottom flanges of the girder. The flange angle provides additional support to the flange and helps to distribute the load across the entire structure.

Types of Flange Angle

The type of flange angle used in a plate girder depends on the design requirements and the load that the structure will need to bear. There are three main types of flange angle:

1. Equal Angle Section: This type of flange angle has two equal legs and is used when the load is evenly distributed across the girder.

2. Unequal Angle with Long Leg Horizontal: This type of flange angle has one long leg and one short leg, with the long leg horizontal. It is used when the load is heavier on one side of the girder than the other.

3. Unequal Angle with Short Leg Horizontal: This type of flange angle has one long leg and one short leg, with the short leg horizontal. It is used when the load is heavier on the top or bottom flange of the girder.

Correct Answer

The correct answer to the question is option 'B': Unequal Angle with Long Leg Horizontal. This type of flange angle is used when the load is heavier on one side of the girder than the other. It provides additional support to the flange and helps to distribute the load evenly across the entire structure.