7.6. Pratt truss

Try these first

1. 1.

   What is a Pratt truss?

   Hint

   Think about the types of forces it manages.

2. 2.

   Name one type of load that a Pratt truss can support.

   Hint

   Consider what kinds of weights are found on structures.

3. 3.

   What is the main feature of the Pratt truss design?

   • Diagonal members slope up
   • Diagonal members slope down
   • No diagonal members

   Hint

   Think about the direction of the triangular shapes.

4. 4.

   True or False: Pratt trusses are most commonly used in constructing short-span bridges.

   • True
   • False

   Hint

   Consider the strengths of the design in favor of span length.

5. 5.

   If a Pratt truss bridge supports a load of 10,000 N and the angle of the diagonal members is 45 degrees, calculate the tension in one of the diagonal members.

   Hint

   Remember to apply your knowledge of sine functions in triangles.

6. 6.

   Discuss the long-term sustainability factors of using Pratt trusses in urban infrastructure development.

   Hint

   Evaluate both structural and environmental aspects.