Civil Engineering Professional Engineer Practice Exam

What structural advantage do arch bridges have over other types?

1. They are easy to construct

2. They can handle larger loads

3. They aesthetically please more than others

4. They require less maintenance

The correct answer is: They can handle larger loads

Arch bridges offer a distinct structural advantage primarily because of their ability to handle larger loads. The inherent design of an arch distributes weight more effectively than many other bridge types. The curved shape of an arch allows the forces acting on it—especially vertical loads, such as vehicles and pedestrians—to be transferred down through the arch to the supports at either end. This efficient distribution of forces enables arch bridges to support heavy loads without requiring excessive material or complex support systems. While ease of construction, aesthetic appeal, and maintenance considerations are important aspects of bridge design, they do not universally apply to all arch bridges in the same way as their ability to bear heavier loads. For example, some arch bridges can be complex to construct, especially larger spans, and while they are often considered beautiful, aesthetic qualities can be subjective. Maintenance requirements can vary significantly depending on the materials and design. Therefore, the unique capability of arch bridges to handle substantial loads stands out as their primary structural advantage compared to other bridge types.