Question

Which of the following statements about plate girder bridges is INCORRECT?
1. It may be either of through or deck construction.
2. Plate girder bridges are recommended for medium spans.
3. Fabrication and erection cost for plate girder bridges are slightly higher than that for truss girder bridges.
4. They can be fabricated at the site in much less time than the truss girder bridges.

Answer 1

Correct Answer - Option 3 : Fabrication and erection cost for plate girder bridges are slightly higher than that for truss girder bridges.

Concept:

Plate girder:

A plate girder is a built-up I-beam section, used to carry heavy loads which cannot be carried economically by rolled I-sections. It is made by riveting or welding the steel plates in an I-beam shape.

Ex: Plate bridge girder

Advantages:

• They can be used to carry heavy loads
• Speed construction
• Grater stability
• High resistance to fatigue failures
• The cost of construction is slightly lower as compared with truss-type bridges.
• Easy for maintenance

Disadvantages:

• They cannot be used to support large spans
• Less architectural appearance
• A bit difficult to handle during the placement
• Production shall be done strictly in accordance with the design.