Concrete Strength under Sustained Loading

Concrete strength under long-term sustained loading was investigated in this paper. By analyzing deformation behavior and damage evolution mechanism of concrete under sustained loading,and by comparing concrete creep and fatigue behavior similarity,the damage evolution ratio was assumed in proportion to strain increasing ratio. The envelope of concrete stress-strain relationship was analyzed with consideration of microcracks evolution in concrete material. The relationship between stress level and critical damage strain was then established. Concrete real strength under sustained loading was achieved. Comparing with existed experiments shows a good correlation.