## ACI 350 & ACI224R-01 Rectangular Section Flexural Crack Width Control

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References

1-ACI350-06 &ACI224R-01,

2- Design of Reinforced Concrete by Jack C. McCormac_9th Ed-2013-1118129849_ACI 318-11.pdf pages 43 (Example 2.3), 6.10 Control of Flexural Cracks

3- RCM ACI Builder v 5.3.0.0 by Eng. Hussein Rida

4- Moment of Inertia of Cracked Section Transformed to Concrete
http://www.concrete.org/technical/ckc/314/314_design_aid_J_1-14_001.pdf

6- Equivalent Stiffness , Is =Ic/n
http://www.bgstructuralengineering.com/BGSMA/BGSMA_Itr/BGSMA_ITR02.htm
for axial force, εc = εc  fc/Ec = fs/Es  ==> F/(Ac Ec) = F/(As Es) ==> thus As Es = Ac Ec  ==> As = Ac * Ec/Es = Ac /n
and for moment, εc = εc  fc/Ec = fs/Es  ==>  M*y/(Is Es) = M*y/(Ic Ec) == > Is = Ic Ec/Es = Ic/n

Calculation Reference
Design of Reinforced Concrete

Rectangular Section Flexural Crack Width Control

ACI350-06 & ACI224R-01

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Submitted On:
29 Sep 2013
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File Date:
29 Sep 2013
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#3 riyansyah 2016-04-18 22:52
Thank you for a nice spreadsheet.

But, I found that the spreadsheet does not limit the max steel stress to fy.

#2 wsyoon22 2013-10-07 02:51
thank you

#1 JohnDoyle 2013-09-29 16:57
I have awarded a 3 month extension to your XLC Pro subscription by way of thanks.