s-anthem
Structural
- Feb 12, 2024
- 1
I have a building that was designed under the 1991 UBC as an Essential Facility (Hospital Parking Garage), so it has an Importance Factor of 1.25 (Note: they did not go up to 1.5 importance factor in UBC 1991). However, the garage is no longer servicing a hospital and they are making updates to it putting it now under Risk Category II Building with an Important Factor of 1.0 for these updates.
I wanted to compare the buildings original seismic story shear/forces and base shear to the new buildings story shear/forces and base shear. I was wondering if my calculations for the existing building should still have an importance factor of 1.25 or because the UBC is such a different code from the modern day IBC that it would be too conservative to get my existing loads with an additional 1.25 factor on them?
This will greatly affect my IEBC checks for the 10% lateral rules so I wanted to make sure that I am comparing apples to apples.
Thank you!
I wanted to compare the buildings original seismic story shear/forces and base shear to the new buildings story shear/forces and base shear. I was wondering if my calculations for the existing building should still have an importance factor of 1.25 or because the UBC is such a different code from the modern day IBC that it would be too conservative to get my existing loads with an additional 1.25 factor on them?
This will greatly affect my IEBC checks for the 10% lateral rules so I wanted to make sure that I am comparing apples to apples.
Thank you!