Behavior of Multiple Lap Splices in Wide Sections


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Title: Behavior of Multiple Lap Splices in Wide Sections

Author(s): M. A. Thompson, J. 0. Jirsa, J. E. Breen, and D. F. Meinheit

Publication: Journal Proceedings

Volume: 76

Issue: 2

Appears on pages(s): 227-248

Keywords: anchorage (structural); beams (supports); bond (concrete to reinforcement); cover;deformed reinforcement; failure; lap connections; reinforced concrete; reinforcing steels; splicing;strength; stress transfer.

Date: 2/1/1979

The performance of lap splices in narrow beam sections (with two bars spliced) has been the subject of extensive investigation. Previous tests have indicated that the failure of spliced sections may initiate at an edge. Twenty-five tests were conducted to study reinforcing bar splice behavior in wide sections. All test specimens were subjected to a two-point loading to produce a constant moment along the splice. Bar sizes ranged from #6 to #14. Other variables included splice length, ratio of bottom cover to clear spacing between splices, transverse reinforcement, and casting position. While test results from wide sections containing multiple lap splices indicate that edge splices may be somewhat weaker than interior splices, a modification of the design equations for the strength of splices in wide sections does not appear to be needed.