A girder bridge is perhaps the most common and most basic bridge. A log across a creek is an example of a girder bridge in its simplest form. In girder bridges there are actually two types of bridges. These bridges are the I-beam bridge and the box beam bridge. These are two different types of commonly used bridges in the united states.
1.Girder-a beam made usually of steel; a main support in a structure.
Here are to illustrations of the bow and I-beam.
The top illustration is the I-beam and it is very noticeable of why it is called the I-beam. The lower illustration is the bow beam which takes form of the box.
The inner plate is known as the web and the top and bottom beams are known as the flanges.
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