Civil Engineering Professional Engineer Practice Exam

What kind of bridge swings on a pivot point?

1. Suspension bridge

2. Swing bridge

3. Arch bridge

4. Underpass bridge

The correct answer is: Swing bridge

A swing bridge is specifically designed to rotate horizontally around a pivot point to allow the passage of watercraft beneath it. The bridge typically consists of a deck that is supported by a truss or girder system and revolves on its pivot, which is often positioned at one end or near the center of the span. This design enables the bridge to open and close efficiently, providing a balance between the need for vehicle passage across the bridge and the navigation of vessels below. In contrast, a suspension bridge relies on cables suspended between towers and is primarily designed for flexibility and long spans without the need for pivoting. An arch bridge utilizes a curved structure to distribute loads and remains stationary in its position, providing support through its arcs. An underpass bridge usually refers to a structure that allows roadways or pathways to pass underneath another roadway or obstacle, typically not involving any movement. Therefore, the characteristics and functionality of a swing bridge uniquely define it as the correct answer.