Title:
Effect of Preexisting Cracks on Lap Splice Strength of Reinforcing Bars
Author(s):
Jiqiu Yuan, Matthew O’Reilly, Adolfo Matamoros, and David Darwin
Publication:
Structural Journal
Volume:
113
Issue:
4
Appears on pages(s):
801-812
Keywords:
bond strength; cold joint; crack width; cracks; cyclic loading; lap splice; preexisting cracks
DOI:
10.14359/51688753
Date:
7/1/2016
Abstract:
The effect of preexisting subsurface cracks on the strength of lap splices was investigated. Ten full-scale beams with No. 11 (No. 36) bars and lap splice lengths of 33, 79, and 120 in. (838, 2007, and 3048 mm) were tested. The beams had mitigating features that prevented catastrophic failure upon propagation of the preexisting cracks, such as staggered splices and the presence of some reinforcement crossing the plane of the cracks. The effect of preexisting cracks on the bar stress at failure was found to be most severe for the shortest splices and not significant for the two other splice lengths evaluated. The effect was found to be dependent on the amount of reinforcement crossing the plane of the cracks. Splice strength was unaffected in beams with the largest amount of reinforcement, and reduced on the order of 50% in beams without any reinforcement crossing the plane of the cracks.
Related References:
ACI Committee 408, 2003, “Bond and Development of Straight Reinforcing Bars in Tension (ACI 408R-03),” American Concrete Institute, Farmington Hills, MI, 49 pp.
ACI Committee 408, 2009, “Guide for Lap Splice and Development Length of High Relative Rib Area Reinforcing Bars in Tension (ACI 408.3R-09) and Commentary,” American Concrete Institute, Farmington Hills, MI, 12 pp.
ASTM A615/A615M-13, 2013, “Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement,” ASTM International, West Conshohocken, PA, 7 pp.
ASTM C78/C78M-10, 2010, “Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading),” ASTM International, West Conshohocken, PA, 4 pp.
Darwin, D.; Dolan, C. W.; and Nilson, A. H., 2016, Design of Concrete Structures, 15th edition, McGraw-Hill, New York, 786 pp.
Darwin, D.; Tholen, M. L.; Idun, E. K.; and Zuo, J., 1996, “Splice Strength of High Relative Rib Area Reinforcing Bars,” ACI Structural Journal, V. 93, No. 1, Jan.-Feb., pp. 95-107.
Eligehausen, R., 1979, “Bond in Tensile Lapped Splices of Ribbed Bars with Straight Anchorages,” Publication 301, German Institute for Reinforced Concrete, Berlin, Germany, 118 pp. (in German)
Hognestad, E., 1951, “A Study of Combined Bending and Axial Load in Reinforced Concrete Members,” University of Illinois Engineering Experimental Station Bulletin Series, No. 399, University of Illinois, Urbana, IL, 128 pp.
NRC, 2013, “Shield Building Concrete Subsurface Laminar Cracking Caused by Moisture Intrusion and Freezing,” NRC Information Notice 2013-04, Nuclear Regulatory Commission, Washington, DC, 5 pp.
Orangun, C. O.; Jirsa, J. O.; and Breen, J. E., 1977, “Reevaluation of Test Data on Development Length and Splices,” ACI Journal Proceedings, V. 74, No. 3, Mar., pp. 114-122.
Tepfers, R., 1973, “A Theory of Bond Applied to Overlapping Tensile Reinforcement Splices for Deformed Bars,” Publication 73:2, Division of Concrete Structures, Chalmers University of Technology, Goteborg, Sweden, 328 pp.
Untrauer, R. E., 1965, discussion of “Development Length for Large High Strength Reinforcing Bars,” ACI Journal Proceedings, V. 62, No. 9, Sept., pp. 1153-1154.
Yuan, J.; O’Reilly, M.; Matamoros, A.; and Darwin, D., 2012, “Effect of Simulated Cracks on Lap Splice Strength of Reinforcing Bars,” SL Report 12-2, University of Kansas Center for Research, Lawrence, KS.
Zuo, J., and Darwin, D., 2000, “Splice Strength of Conventional and High Relative Rib Area Bars in Normal and High-Strength Concrete,” ACI Structural Journal, V. 97, No. 4, July-Aug., pp. 630-641.