35.18. Use of PGA in Performance-Based Seismic Design (PBSD)

Try these first

1. 1.

   What does PGA stand for, and what does it measure?

   Hint

   Think about what peak means in this context.

2. 2.

   List the three performance objective categories linked to PGA.

   Hint

   Remember the acronym OLC.

3. 3.

   What does PGA stand for?

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

   Hint

   Focus on the terms related to ground forces.

4. 4.

   Which performance objective is linked with a PGA of approximately 0.1g?

   • Life Safety
   • Collapse Prevention
   • Operational

   Hint

   This is the lowest threshold among the three objectives.

5. 5.

   Given a structure designed for Life Safety, estimate the performance implications if it is subjected to a PGA of 0.4g.

   Hint

   Reflect on what exceeding the design limit means for structural integrity.

6. 6.

   Propose a method for evaluating the seismic risk of a new building using PGA and annual exceedance probabilities.

   Hint

   Consider both geographic location and historical seismic activity.