4.2.2. Example 4-1: Truss, Method of Joints

Try these first

1. 1.

   What is meant by the term 'truss'?

   Hint

   Think about how triangles support weight effectively.

2. 2.

   What does it mean if a member in a truss is compressed?

   Hint

   Consider what happens when you push on a straw.

3. 3.

   What does the method of joints primarily help determine in a truss?

   • The stability of the truss
   • The forces acting in the members of the truss
   • The material properties of the truss
   • None of the above

   Hint

   Think about what the method specifically focuses on.

4. 4.

   True or False: If a calculated member force is negative, it indicates that the member is in tension.

   • True
   • False

   Hint

   Recall what the sign convention tells us.

5. 5.

   Given a truss with six members and three joints, if the forces in two members are known, derive the other forces using the method of joints.

   Hint

   Start from joints where you have maximum known values.

6. 6.

   Analyze a loaded truss where one member fails and calculate resultant forces in adjacent members.

   Hint

   Refer back to earlier calculations to see how force changes propagate across the truss.