Abstract
A rational and simple analytical model to predict the time varying cracking moment ofreinforced concrete sections under sustained loading is developed. The modeling procedure is based onequilibrium and compatibility requirements and takes into account the interdependent effects of creep andshrinkage as well as the presence of axial loading. A parametric study is conducted in which particularconsideration is given to the effects of reinforcement ratio, level of loading, and creep and shrinkagecharacteristics of concrete. It is concluded that the reduction in cracking moment is mainly attributed toshrinkage. The effect of shrinkage is more pronounced at low levels of sustained loading and at highreinforcement ratios. This effect is lessened by the compression steel and creep particularly when theapplied moment is near the cracking moment. KCI Citation Count: 1