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ACI 350 & ACI224R-01 Rectangular Section Flexural Crack Width Control
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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
and excel sheets for chapter 6

3- RCM ACI Builder v by Eng. Hussein Rida

4- Moment of Inertia of Cracked Section Transformed to Concrete

5-Quadratic eq

6- Equivalent Stiffness , Is =Ic/n
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

Submitted By:
Mohamed Abu Shady (m_ali_abushady)
Submitted On:
29 Sep 2013
File Size:
46.04 Kb
File Version:
File Author:
Mohamed Abu Shady
Total Votes:8
Comments: 3
riyansyah 3 years ago
Thank you for a nice spreadsheet.

But, I found that the spreadsheet does not limit the max steel stress to fy.
wsyoon22 6 years ago
thank you
JohnDoyle[Admin] 6 years ago
I have awarded a 3 month extension to your XLC Pro subscription by way of thanks.

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