3. Analysis of Pin-Jointed Trusses (Roof Trusses)

Try these first

1. 1.

   What is a dead load?

   Hint

   Think about what is permanently part of the structure.

2. 2.

   Name one type of truss.

   Hint

   Recall the trusses we discussed in class.

3. 3.

   Which type of load does the self-weight of the roof fall under?

   • Dead Load
   • Imposed Load
   • Wind Load

   Hint

   Think about what is permanently part of the roofing system.

4. 4.

   True or False: Wind loads always act to compress truss members.

   • True
   • False

   Hint

   Consider the direction of wind forces on structures.

5. 5.

   A Pratt truss spans 10 meters and must support a live load of 2 kN/m² and a dead load of 1 kN/m². Calculate the forces in the top chord and bottom chord members. Assume uniform load distribution.

   Hint

   Start by calculating total loads before analyzing member forces.

6. 6.

   Design a Warren truss to support a shaded area with a snow load of 3 kN/m². Identify the dimensions and configurations of the truss members and evaluate for safety against wind uplift.

   Hint

   Consider wind effect on the truss members within your design.