Is anyone familiar with the logic behind the coefficients 0.87 and 0.77 in Tale 6-1 (page 77) of ASCE 7-05?
The Importance Factor "I" for Hurricane Prone Regions with V>100 mph is 0.77.
While for Non-Hurricane Prone Regions & Hurricane Prone Regions with V<100 mph, it is 0.87.
Regards
Casey (Khashayar) Hemmatyar, SE