12.1.1. Stiffness vs Flexibility

Try these first

1. 1.

   What is the main variable in the flexibility method?

   Hint

   Think about what we solve for in structural equations.

2. 2.

   What is a characteristic of the stiffness method?

   Hint

   Consider what we need to calculate in this method.

3. 3.

   What is the primary variable in the stiffness method?

   • Forces
   • Displacements
   • Static Load

   Hint

   Remember what each method focuses on: forces or displacements.

4. 4.

   The flexibility method primarily deals with which type of indeterminacy?

   • True
   • False

   Hint

   Think about the definitions of indeterminacy types.

5. 5.

   Analyze a two-dimensional frame structure and compare the use of flexibility and stiffness methods. What insights into the internal forces and displacements can be gained?

   Hint

   Draw the frame and label your equations and forces.

6. 6.

   Demonstrate the process of converting a statically indeterminate structure into a determinable one using flexibility method steps. Provide a clear example.

   Hint

   Consider how many supports you need to remove to reach statical determinacy.