30.11.2. Ground Motion Selection and Scaling

Try these first

1. 1.

   What is ground motion selection?

   Hint

   Think about how engineers choose examples of potential earthquakes.

2. 2.

   Why is scaling necessary?

   Hint

   Why can't we just use the raw data as it is?

3. 3.

   What does ground motion selection involve?

   • Choosing random records
   • Selecting records that reflect site seismicity
   • Ignoring past data

   Hint

   Think about the characteristics of the earthquake events.

4. 4.

   Scaling ground motions is necessary to match what?

   • Random values
   • Target response spectrum
   • Historical data

   Hint

   Match it to the spectrum used in seismic design.

5. 5.

   A new bridge in a seismic zone requires a Sa vs. T curve for analysis. Given the average period of the bridge is about 0.8s, select historical earthquake records and scale them to match a UHS representing a 10% probability of exceedance in 50 years.

   Hint

   Consider the geological conditions of the site and its corresponding seismicity.

6. 6.

   Discuss the potential consequences of using inadequate ground motion data in the seismic analysis of a new hospital design.

   Hint

   Reflect on the importance of safety in critical infrastructure.