Title: Spacing of Spliced Bars in Tension Pull-Out Specimens

Author(s): S. J. Chamberlin

Publication: Journal Proceedings

Volume: 49

Issue: 12

Appears on pages(s): 261-274

Keywords: no keywords

DOI: 10.14359/11817

Date: 12/1/1952

Abstract:
The effect of spacing of parallel bars was investigated with tension pull-out specimens. Prisms of concrete, square in cross section and of variable length, contained three bars; one bar was embedded along the vertical axis and ex-tended downward, two other bars paralleled the center bar and extended up-ward. Slip of the center bar was measured at both the loaded and free end. Symmetrical spacing between the bars, from adjacent-tied to a clear seperation, of three bar diameters, was the major variable. Three different concretes and three types of bar-plain, one type of old-style deformed, and one type of new high-bond-were included. Results indicate that-the bond of plain bars is not appreciably affected by spacing of the bars. Bars having ono type of old-style deformations and bars having one type of deformation meeting current requirements for deformed bars developed better average bond stresses in adjacent-tied splices even without mechanical interlock than in spaced splices. Spacings, other than adjacent-tied, do not appear to affect bond significantly.