35.16. Design Spectrum and its Relationship with PGA

Try these first

1. 1.

   What does PGA stand for?

   Hint

   It refers to the maximum acceleration during an earthquake.

2. 2.

   Is the design acceleration spectrum anchored at PGA?

   Hint

   Consider what 'anchor' means in context.

3. 3.

   What does PGA represent?

   • Peak Ground Acceleration
   • Peak Ground Area
   • Peak Ground Analysis

   Hint

   Consider what the 'P' stands for.

4. 4.

   True or False: The design acceleration spectrum decreases with increasing period for long-period structures.

   • True
   • False

   Hint

   Relate this to how buildings behave during different types of seismic forces.

5. 5.

   If a building must be designed in Zone IV with a PGA of 0.24g, how would a structural engineer approach the design compared to one in Zone II, which has 0.10g?

   Hint

   Think about the difference in numerical values for each zone and how that impacts structural integrity.

6. 6.

   The amplification factor for a short-period structure is 1.5. If its base design needs to withstand a PGA of 0.24g, what would be the effective design PGA considered?

   Hint

   Consider how multiplication affects scale when factoring in risks during an earthquake.