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Effect of Simulated Cracks on Lap Splice Strength of Reinforcing Bars
Yuan, Jiqiu O’Reilly, Matthew Matamoros, Adolfo B. Darwin, David
Yuan, Jiqiu
O’Reilly, Matthew
Matamoros, Adolfo B.
Darwin, David
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Abstract
The effect of preexisting cracks, oriented in the plane of and parallel to the reinforcing
steel, on the strength of No. 11-bar lap splices was investigated by testing six beams – three with
a splice length of 79 in. and three with a splice length of 120 in. One of the beams with a 79-in.
splice was cast monolithically and loaded monotonically to failure. To simulate the cracks, the
other five beams were cast with a cold joint at the mid-height of the reinforcing steel. Two beams
(one with a 79-in. splice and one with a 120-in. splice) with a cold joint were loaded
monotonically to failure. The other three beams were preloaded to develop horizontal cracks in
the face of the cold joint, unloaded and then loaded to failure; those beams developed horizontal
cracks with widths of 20, 30 and 35 mils (0.02, 0.03, 0.035 in.) during the first cycle of loading
and just prior to unloading. The nominal concrete compressive strength was 5000 psi.
The methods described in this report provide a viable means of simulating a crack in the
plane of flexural reinforcement. In the presence of a simulated crack in the plane of the
reinforcing bars, the two specimens with lap-spliced No. 11 bars with a 79-in. splice length
achieved bar stresses of 62 and 57 ksi. In the presence of a simulated crack in the plane of the
reinforcing bars, the three specimens with lap-spliced No. 11 bars with a 120-in. splice length
achieved bar stresses of 72, 67, and 69 ksi.
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2012-06
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University of Kansas Center for Research, Inc.
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This item contains archived web content.
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SLReport12_2.pdf
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Yuan, J., O'Reilly, M., Matamoros, A., and Darwin, D., "Effect of Simulated Cracks on Lap Splice Strength of Reinforcing Bars," SL Report 12-2, University of Kansas Center for Research, Inc., Lawrence, Kansas, June 2012, 243 pp.
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https://iri.ku.edu/reports