Problem 2.18

 

 

Mean recurrence interval for basic wind speed:  50 years

 

See lengthy discussion in commentary.

ASCE 7 section C6.5.4

ASCE 7 section C6.5.5

annual exceedance probability		annual recurrence interval
as percent	as probability
50%	0.50	2-year
20%	0.20	5-year
10%	0.10	10-year
4%	0.04	25-year
2%	0.02	50-year
1%	0.01	100-year

source

 

Mean recurrence interval for wind on essential and hazardous facilities:  100 years

 

occupancy category IV from ASCE 7 table 1-1

importance factor 1.15 from ASCE 7 table 6-1

ASCE 7 section C6.5.5

 

Height used for building-height-and-exposure adjustment factor, λ:  mean roof height

  

ASCE 7 section 6.4.2

ASCE 7 figure 6-2