Shear capacity of concrete beams under sustained loading

摘要

The aim of this research is to predict the time-dependent mechanical behaviour of cracked concrete shear-critical beams without web reinforcement subjected to high levels of sustained loading. 42 concrete beams without shear reinforcement are tested under a sustained load close to their ultimate shear capacity, for periods ranging from 3 to 24 months. The beams are designed to fail in shear. The applied load is higher than 87% of the short term shear capacity. The crack opening displacement and crack length development are monitored in time. The experimental results show that there is no significant sustained loading effect on the shear capacity of concrete beams.