Anchorage of Reinforcing Bars for Reversed Cyclic Loading

摘要

An analytical model is developed that predicts the load-slip characteristics of reinforcing bars anchored within exterior beam-column joints in reinforced concrete structures subject to earthquake loading. The model is developed from knowledge of fundamental mechanical characteristics for the reinforcing bar, for the interface between that bar and the surrounding concrete, and from the requirements for continuity of forces and displacements along the anchorage length for the bar. The analytical results predicted by the model are compared to experimental results for 22 specimens. Variables included in the specimens were the loading history for the bar, the yield strength for the bar, the size of the bar, the embedment length for the bar, the strength of the concrete and the use of a straight bar or a bar terminating with a standard 90 degree hook. Good agreement is obtained between the measured results and those predicted by the model for both monotonic and reversed cyclic loading.