Rate of Loading Effects on Uncracked and Repaired Reinforced Concrete Members,

摘要

The effect of high loading rates on the behavior of reinforced concrete structures and the effectiveness of the epoxy-injection technique of repairing cracks in such structures have been studied through tests on six simply-supported,doubly-reinforced,concrete beams. Zones of time-varying moment were developed in the specimens by imposing the same displacement histories at the third points of the beams with electronically controlled hydraulic actuators. Damage in two of the specimens was limited so that they could be repaired by the injection of epoxy resins into cracks and later retested. An additional steel wide flange beam was tested to evaluate the performance of the experimental facilities. Steel and concrete strains,curvatures,and deflections were continuously monitored and are presented in the appropriate hysteretic forms. The results are interpreted with specific regard to the effects of rate of loading and crack repair on the stiffness,strength,ductility,and energy absorption and dissipation capacities of the specimens.