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ACI318-95 Permissible concrete tensile stress in prestressed concrete

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18.4.2 (c) and (d) of ACI318-95, perimissilbe concrete tensile stress equal to 6 sq rt f_ci and/or 12 sq rt f'_c in precompressed tensile zone, were removed in ACI318-02.
Can anybody give me background info about this change?
 
 
****Wontae Kim****
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