Lap Splices in Reinforced Concrete under Impact

by Telvin Rezansoff, Assoc. Prof.; Dept. of Civ. Engrg., Univ. of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N OWO,
John E. Breen, (F.ASCE), J.J. McKetta Prof.; Dept. of Civ. Engrg., Univ. of Texas, Austin, Tex.,
James O. Jirsa, (M.ASCE), Prof.; Dept. of Civ. Engrg., Univ. of Texas, Austin, Tex.,

Serial Information: Journal of the Structural Division, 1981, Vol. 107, Issue 8, Pg. 1611-1628

Document Type: Journal Paper


The performance of lap splices subjected to impact loading was studied and compared with that of splices under static loading. Nineteen specimens were tested under impact loading, with failure produced in either one impact, in the three to five impacts of incrementally increasing magnitude, or under either unidirectional or reversed cycling of the impact load. Analytical studies were carried out to help evaluate the experimental data. The impact moment capacity of the splices tested was equal to or greater than the static moment capacity. The splice strength achieved under impact could be computed using material strengths adjusted for the strain rate imposed. Under large impact loads (producing high strain rates), the moment capacity of the splice region can greatly exceed the static moment capacity, but failure occurs after only a few load applications. With smaller impacts loads, more cycles of load were carried before failure.

Subject Headings: Impact loads | Failure loads | Reinforced concrete | Moment (mechanics) | Load bearing capacity | Failure analysis | Strength of materials | Load tests

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