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RE: I crack.

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Not sure if this will help, but I recently wrote an Excell spreadsheet to compute Icr.  Of course it requires input of reinforcing steel areas, but being in spreadsheet format, it's easy to compute Icr for various steel areas.  
Can I e-mail this to you at your "From" e-mail address?
Bob G.
-----Original Message-----
From: Alex [mailto:seaosd(--nospam--at)]
Sent: Monday, September 20, 2004 12:09 PM
To: seaint(--nospam--at)
Subject: I crack.

I am working on a 20 story with concrete shear walls. for calculation of Ieff we use formula (9-8)(318/318/R-103) of ACI. which needs calculation of Icrack.
Icrack is again a function of steel reinforcement in the section (which is not known before analysis) and I think practically it is almost impossible to calculate it for each section at each story with lots of trial and errors. I have been advised to use [ Icrack=(0.35 - 0.5) x Igross ] that I don't feel comfortable with it.
Any experience or advise on that would be really appreciated.
Alex M,PE
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