30.12.3. Table of Correction Factors (as per IS/Eurocode)

Try these first

1. 1.

   What is the reduction factor at 0% damping?

   Hint

   Check the table provided in the section.

2. 2.

   Does the reduction factor increase or decrease as damping increases?

   Hint

   Think about energy dissipation as damping increases.

3. 3.

   What reduction factor corresponds to a damping ratio of 20%?

   • 1.00
   • 0.80
   • 0.55

   Hint

   Review the table of correction factors.

4. 4.

   True or False: The reduction factor increases as the damping ratio increases.

   • True
   • False

   Hint

   Consider the reasoning behind energy dissipation.

5. 5.

   A structure has a spectral acceleration of 1g. If the damping ratio is increased to 20%, calculate the new spectral acceleration using the corresponding reduction factor.

   Hint

   Multiply the original spectral acceleration by the reduction factor for 20% damping.

6. 6.

   For a building with a 30% damping ratio, you find that its spectral acceleration before applying the correction is 0.75g. Calculate the adjusted spectral acceleration based on the provided correction factor.

   Hint

   Check the table for the reduction factor for 30% damping.