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

Question

Quizplus · Accepted Answer

The combined effect of creep and shrinkage in concrete can be represented by the formula $(C - 1)mf + eE$, where $C$ is the creep coefficient, $m$ is the modular ratio (ratio of modulus of elasticity of steel to that of concrete), $f$ is the original pre-stress in the concrete, and $eE$ represents the effect of shrinkage strain multiplied by the modulus of elasticity of steel. This formula accounts for the increase in strain due to creep ($C - 1)mf$ and the additional strain from shrinkage ($eE$).

If C Is Creep Coefficient, F Is Original Pre-Stress in Concrete