Orthotropic deck

High school (ages 12+)
Geography

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/orthotropic-deck

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the structural principle?Combines a steel deck plate with longitudinal ribs and/or transverse floor beams
2. What is the material properties?Exhibits anisotropic elastic behavior, with different stiffnesses in longitudinal and transverse directions
3. Why do bridge tops made of orthotropic decks weigh less than concrete decks?Because the steel plate and stiffeners use less material than a thick concrete slab, the deck is lighter. The lighter weight means the bridge needs smaller foundations and costs less to build.
4. How do the ribs or floor beams help a bridge stay strong?The ribs run along the length of the bridge and the floor beams run across it. They give the plate extra bending and shear resistance, so the weight of cars goes straight to the bridge’s big beams.

Anisotropic: Having properties that differ in direction; not uniform in all directions.
Composite structure: A structure made from two or more different materials that work together.
Fatigue cracking: Cracks that form in a material due to repeated stress cycles over time.