14.6. Factors Affecting Natural Frequency

Try these first

1. 1.

   What happens to natural frequency when mass is added to a structure?

   Hint

   Consider the relationship between mass and frequency.

2. 2.

   Define the soft storey effect.

   Hint

   Think about how strength varies within a structure.

3. 3.

   What is the effect of adding mass to a structure?

   • Increases natural frequency
   • Decreases natural frequency
   • No effect

   Hint

   Consider the physics of mass and frequency.

4. 4.

   True or False: Weak stiffness can make a structure more vulnerable in seismic events.

   • True
   • False

   Hint

   Think about structural integrity in vibrations.

5. 5.

   Analyze a scenario where a high-rise building with uneven mass distribution is subjected to an earthquake. Discuss potential failures and suggest design improvements.

   Hint

   Consider the relationship between structure design and earthquake impacts.

6. 6.

   Calculate the impact of changing boundary conditions on a specific structure's natural frequency. How would it differ if changed from fixed to pinned?

   Hint

   Reflect on how the constraints influence frequency calculations.