30.16. Spectral Acceleration in Seismic Isolation and Dampers

Try these first

1. 1.

   What happens to the spectral acceleration when using base isolation?

   Hint

   Think about the earlier periods in the response spectrum.

2. 2.

   Name one type of energy dissipation device.

   Hint

   Consider devices that soften the building's response to shaking.

3. 3.

   What does spectral acceleration refer to?

   • The maximum velocity of a structure
   • The maximum acceleration experienced by a structure under seismic forces
   • The average force on a structure

   Hint

   Think about the forces experienced during shaking.

4. 4.

   True or False: Base isolation generally increases the spectral acceleration experienced by a building.

   • True
   • False

   Hint

   Consider the concept of decoupling a structure from ground motion.

5. 5.

   A new base-isolated building design anticipates a damping ratio of 15%. Calculate the expected spectral acceleration given a standard response spectrum for 5%. What impact does this have on the design?

   Hint

   Refer to the reduction factor table provided in the chapter.

6. 6.

   Evaluate the effects of installing energy dissipation devices on a multi-storey structure's behavior during an earthquake. What calculations must be performed to reassess the design?

   Hint

   Consider how energy absorbed impacts the overall forces experienced by the structure.