5.1.3. Importance in Earthquake Engineering

Try these first

1. 1.

   What does DOF stand for?

   Hint

   Think about how many independent movements a structure can have.

2. 2.

   What does the natural frequency determine in a structure?

   Hint

   Consider how vibrations can impact the structure.

3. 3.

   What do Degrees of Freedom (DOF) refer to?

   • The number of possible structural movements
   • The number of floors in a building
   • The total mass of a structure

   Hint

   Think about how a structure can move.

4. 4.

   True or False: Increasing the number of DOF simplifies the structural analysis.

   • True
   • False

   Hint

   Consider how much more effort it takes with more movements.

5. 5.

   A multi-story building has been modeled with 12 DOFs. If during a seismic analysis it was found that the first two modes account for 80% of the response, is it reasonable to consider it a single-degree-of-freedom system for certain analyses? Justify your answer.

   Hint

   Consider the concept of mass participation in SDOF.

6. 6.

   Explain the impact of ignoring rotational degrees of freedom in an asymmetric structure during seismic analysis.

   Hint

   Think about how torsion complements translation in buildings.