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ACI318-05: Minimum Reinforcements

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Hi,
 
Can anybody explain how (11.9.5), 0.04f'c /fy, was adopted?
Why is it different from (10.5.1)?
According to (10.5.3), (10.5.1) can be waived.
Doesn't (11.9.5) have any exception?
 
I think this Asc of (11.9.5) should often be used for (11.9.4).
How can I put Ah reinforcement in continuous ledge (not corbel like Fig R11.9.2)?
Do I really need to apply (11.9.4) for continuous ledge?
 
I am looking forward to your comments.
 
 
Thanks a lot!
 
 
 
 
Wontae Kim
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