Lapped Splices For High Strength Reinforcing Bars


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Title: Lapped Splices For High Strength Reinforcing Bars

Author(s): Phil M. Ferguson and John E. Breen

Publication: Journal Proceedings

Volume: 62

Issue: 9

Appears on pages(s): 1063-1078

Keywords: beam, bond strength, cracking, high strength steel, lapped splice, reinforced concrete, research, splice

Date: 9/1/1965

Tests of 35 beams, each containing lapped splices of # 8 or # 11 bars of high strength steel in a constant moment region, are reported. Splices with # 11 bars behaved exceptionally well, developing bond stresses slightly higher than the # 8 bars and indicating that the ACI Code splice provisions for # 11 bars are a little severe. The shape of the steel stress-strain curve had little influence on splice strength. No loss in bond strength developed when steel -strains as high as 0.006 to 0.009 were reached. One # 11 bar specimen at a steel strain of 0.011 developed lower bond resistance but a # 8 bar specimen at 0.012 strain showed no such effect. The few beams having stirrups over the splices gave higher strengths, but the main study was related to splices without stirrups.