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4. | 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 | |