3.9.1. Natural Frequency and Resonance Avoidance

Try these first

1. 1.

   Define natural frequency.

   Hint

   Think about how structures behave when not disturbed.

2. 2.

   What is resonance?

   Hint

   Consider how sounds may amplify in a room.

3. 3.

   What is the term for the frequency at which a structure tends to vibrate naturally?

   • Damping
   • Natural Frequency
   • Resonance

   Hint

   This is a foundational concept in structural dynamics.

4. 4.

   True or False: Damping significantly alters the natural frequency of a structure.

   • True
   • False

   Hint

   Focus on the role of damping versus its effect.

5. 5.

   A 10-story building has a natural frequency of 1 Hz. During an earthquake, the ground motion has a frequency of 1 Hz. Analyze the effect of this resonance without sufficient damping.

   Hint

   Think about how resonance changes the amplitude of vibrations.

6. 6.

   Propose an engineering solution to reduce the impact of resonance in a high-rise structure undergoing severe seismic loading.

   Hint

   Consider how mass can be used to counteract movement.