6.18.3. Base Isolation and Tuned Mass Dampers

Try these first

1. 1.

   What is base isolation?

   Hint

   Consider what separates the structure from the ground.

2. 2.

   What does a tuned mass damper do?

   Hint

   Think of how a tuning fork works.

3. 3.

   What is the primary function of base isolation?

   • To enhance aesthetic appeal
   • To reduce seismic forces on buildings
   • To increase structural stiffness

   Hint

   Think about how it protects the structure.

4. 4.

   True or False: A tuned mass damper is used to increase vibrations in a structure.

   • True
   • False

   Hint

   Consider the purpose of a damper.

5. 5.

   Given a hotel building in a highly seismic zone, propose a design strategy including base isolation and TMD. Analyze the impacts on safety and costs.

   Hint

   Consider both immediate and long-term safety benefits.

6. 6.

   Calculate the effective damping ratio of a tuned mass damper if the primary structure has a natural frequency of 1 Hz and the TMD is tuned to 2 Hz.

   Hint

   Use formulas from vibration analysis to relate damping ratios.