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Title Experiment on Noncontact Lap-Splices of D13 and D19 Reinforcing Bars with Wide Spacing between Spliced Bars
Authors 문소현(So-Hyun Mun) ; 천성철(Sung-Chul Chun)
Page pp.51-60
ISSN 1229-5515
Keywords 비접촉겹침이음; 부착; 이음철근 사이 간격 noncontact lap splice; bond; spacing between spliced bars
Abstract In the Concrete Design Code of Korea, bars spliced by noncontact lap splices should not be spaced transversely farther apart than the lesser of one-fifth the required lap splice length or 150 mm. The structural behavior of noncontact lap splices with D13 and D19, which are spaced transversely farther apart than the provisions of the Concrete Design Code of Korea, was tested in this work. The test results showed that the behavior of noncontact laps is similar to the behavior of contact laps within the transverse spacing of spliced bars of 225 mm. Regardless of the spacing between spliced bars, the flexural cracks on the sides were similar for all specimens. The load-deflection relationships of all specimens were similar to the deflection curves of flexural members determined according to KDS 14 20 30, implying that all specimens deformed like ideal flexural members. As the spacing between spliced bars increases, there is no significant difference in the load-deflection relationships. Comparisons of test results of noncontact laps with the predictions by the design code provision, Orangun et al. (1977)’s equation, and the ACI Committee 408 equation show that the test-to-prediction ratios of 1.27, 1.54, and 1.23, respectively, indicating that the noncontact laps had sufficient strength. Consequently, noncontact laps within a 225 mm transverse spacing have equivalent strength and behavior and can be safely designed using the previous equations.