A theoretical model for the anti-fatigue design of steel reinforced ECC composite system under flexure

摘要

A theoretical model was developed for the anti-fatigue design of steel reinforced ECC (Engineered Cementitious Composites) composite system (SRECS) under flexure. The fatigue properties of both ECC and steel reinforcement were comprehensively considered in this model. Static flexure tests on full-scale steel reinforced ECC link slabs were carried out and the previous experimental results of ECC link slabs and plain ECC beams under fatigue flexure were adopted to calibrate the proposed model. The predicted fatigue life of the ECC link slabs is basically consistent with the tested results. Considering the sensitiveness of the proposed algorithm, the relationship between the stochastic attributes of fatigue stress level and fatigue life of ECC in SRECS was established, which can promises sufficient guarantee rate by control the level of applied fatigue flexure.