30.13.1. Vertical-to-Horizontal (V/H) Ratio

Try these first

1. 1.

   What does the V/H Ratio range from?

   Hint

   Think about the scale in seismic design.

2. 2.

   Which formula represents the relationship between vertical and horizontal spectral acceleration?

   Hint

   What variable represents the V/H ratio?

3. 3.

   What is the typical range for the V/H Ratio?

   • 0.1 to 0.5
   • 0.3 to 0.7
   • 0.5 to 0.9

   Hint

   Think of the common values used in engineering.

4. 4.

   True or False: The V/H ratio can directly affect the design of long-span bridges.

   • True
   • False

   Hint

   Consider what forces long-span bridges face.

5. 5.

   A new bridge design requires addressing a V/H ratio of 0.5. If the horizontal spectral acceleration is measured at 1g, what would be the estimated vertical spectral acceleration?

   Hint

   Multiply the horizontal acceleration by the V/H ratio.

6. 6.

   Evaluate how changes in the V/H ratio might influence the design of a structure built in a low seismic zone versus a high seismic zone.

   Hint

   Consider the differences in seismic activity and engineering approaches.