IDA analysis results

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ashf
Posts: 31
Joined: Sat Sep 26, 2015 5:06 am

IDA analysis results

Post by ashf »

Hello,
I have a 2D 5-story steel frame.braces are modeled by fiber model and beams and columns are modeled by modified Medina Ibarra Krawinkler model.Although push-over curve seems reasonable and is coincident with push-over curve in SAP2000 program, but when I perform IDA analysis,IDA curve (PGA(g) vs Max inter story dift ratio ) doesn't show horizontal part,in other word,the frame doesn't get instability even at very big accelerations such as 9pga!!
why does it happen?
Thanks in advance.
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