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Title |
Experimental Evaluation on the Reinforcement Details of Splice Strength of Hooked Bars
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Authors |
한상민(Sang-Min Han) ; 천성철(Sung-Chul Chun) |
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DOI |
https://doi.org/10.4334/JKCI.2024.36.6.573 |
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Keywords |
갈고리철근; 겹침이음; 부착; 이음길이 hooked bar; lap splice; bond; splice length |
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Abstract |
As the use of high-strength materials increases and the dimensions of strctural members decreases, shorter lap splice lenghts are required. To enhance the spliced strength of lapped hooked bars, transverse reinforcement should be placed across possible cracks along the splice length and details restraining prying action due to flexural deformation is required. This study suggested four details to enhance the splice strength of lapped hooked bars: extending a hook tail into the compression region, adding transverse confining reinforcement, including horizontal confining reinforcement, and arranging splices in a zigzag pattern. A total of 14 lap tests were conducted. The results indicated that all proposed details increased the deformation capacity, with transverse confining reinforcement proving to be the most effective in increasing splice strength. However, the increase of lap length is not effective. The average test-to-prediction ratios for all specimens exceeded 1.50 for three equations, except for the equation derived from the development length equation of hooked bars. This implies that the splice strength of lapped hooked bars is 1.5 times greater than the splice strength of lapped straight bars.
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