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The eccentricity required at the section of maximum moment at midspan is

3,572 2,490,638

416,208 416,208

Since cb = 18.84 in., and assuming a cover of 3.75 in., try ec = 18.84-3.75 = 15.0 in. (381 mm):

Required area of strands Ap = — =-= 2 . 2 in . 2 (14 . 2 cm2)

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