HELP

[Peace10]

Hello Everybody !!

I have a duration of earthquake excitation = 11s & I want to know its frequency !! is there any one who know how can i solve this problem ??
Thanks

 

[Ron]

See this link....

http://www.fema.gov/media-library-data/20130726-1556-20490-0102/fema454_chapter4.pdf

 

[Peace10]

Thanks a lot !!