Situation where I have axial tension on a reinforced concrete column. I don't due alot of concrete design so please bear with me. Crack control isn't an issue as in like a water tank design. My 11th edition of Design of Concrete Structures equation 1.14 says P=fy*As, but the next proceeding line states "to provide adequate safety, the force permitted in a tension member under normal service loads should be of order of 1/2P". I don't understand the service load portion? Can't I just use my .9 phi factor and use my ultimate load in equation 1.14?
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