Reinforced Concrete Beams Under Repeated Loads

by Walter M. Ruiz,
George Winter,

Serial Information: Journal of the Structural Division, 1969, Vol. 95, Issue 6, Pg. 1189-1211

Document Type: Journal Paper


This paper describes the results of an experimental program of the effect of repeated loads on the rotation and load carrying capacity of reinforced concrete beams. Comparing results obtained under repeated loading with results obtained on similar specimens under single loading showed that neither the rotation nor the load carrying capacity of a reinforced concrete beam is affected by several cycles of near ultimate loading. Repeated loading always caused a relatively small increase in deformation that appears to be related to destruction of bond and to additional cracking at the level of the reinforcement, or to both. The rotation capacity of a plastic hinge was found to be greatly affected by variations in the concrete strength, by variations in the position of the compression steel, and by variations in the restraint provided by the stirrup to the compression bar.

Subject Headings: Load bearing capacity | Ultimate loads | Reinforced concrete | Concrete beams | Rotation | Repeated loads | Load factors | Plastic hinges

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