If C is creep coefficient, f is original pre-stress in concrete, m is modular ratio, E is Young’s modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is________________?
(A) (1 – C) mf – eE
(B) (C – 1)mf + eE
(C) (C – 1)mf – eE
(D) (1 – C)mf + eE
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